阅读说明：本技术 一种电导率优良的铝合金铸锭及其生产工艺 (Aluminum alloy ingot with excellent conductivity and production process thereof ) 是由 陈伟 于 2021-08-27 设计创作，主要内容包括：本发明公开了一种电导率优良的铝合金铸锭及其生产工艺,涉及铝合金铸锭技术领域,为解决现有的铝合金铸锭在生产过程中存在电导率偏低的问题,无法达到设计要求的问题。包括如下步骤,步骤一：铝合金熔炼,铸造铝合金的组织由固溶有Si、Mg、Cu等合金元素的铝基体和共晶Si组成,Si含量为百分之四,Mg含量为百分之零点五,Cu含量为百分之一,添加Zr和Cr,Zr含量为百分之零点三,Cr含量为百分之零点二,将纯铝和中间合金配置好,置于炉中熔化,合金炉料在熔池中分布均匀,炉料装平,炉料装完后升温,过热温度为七百四十摄氏度,保温十分钟,压入C2CL6进行除气,铝合金从固态转变为液态,在炉料软化下榻时在表面撒粉状溶剂覆盖。(The invention discloses an aluminum alloy ingot with excellent conductivity and a production process thereof, relates to the technical field of aluminum alloy ingots, and aims to solve the problems that the conventional aluminum alloy ingot has low conductivity in the production process and cannot meet the design requirements. The method comprises the following steps: smelting an aluminum alloy, wherein the structure of the cast aluminum alloy consists of an aluminum matrix in which alloy elements such as Si, Mg, Cu and the like are dissolved and eutectic Si, the content of Si is four percent, the content of Mg is one-half percent, the content of Cu is one-half percent, Zr and Cr are added, the content of Zr is one-half percent and the content of Cr is two-half percent, pure aluminum and intermediate alloy are prepared and placed in a furnace for melting, alloy furnace burden is uniformly distributed in the molten pool, the furnace burden is flatly loaded, the temperature is raised after the furnace burden is loaded, the overheating temperature is seven-hundred-forty ℃, the temperature is kept for ten minutes, C2CL6 is pressed in for degassing, the aluminum alloy is converted from a solid state to a liquid state, and powdery solvent is spread on the surface to cover when the furnace burden is softened and laid down.)

1. An aluminum alloy ingot excellent in electric conductivity, characterized in that: the aluminum alloy cast ingot with excellent conductivity is processed by a cooling box (1), wherein the cooling box (1) comprises a first cooling mechanism (2), a second cooling mechanism (3), a third cooling mechanism (4), a fourth cooling mechanism (5), a water cooling plate (6), an air cooling plate (7), a cooling fan (8), a cooling water circulating pipe (9), a liquid inlet (10), a liquid return port (11), a mounting plate (12), a mist cooling plate (13), a mist cooling nozzle (14), a compressed air tank (15), a cooling liquid storage tank (16), a gas-liquid mixing tank (17), a pump body (18), a mist cooling pipe (19), a base platform (20), a storage plate (21), a sliding block (22), a sliding groove (23), a through groove (24) and fins (25);

the production process of the aluminum alloy ingot with excellent conductivity comprises the following steps:

the method comprises the following steps: smelting an aluminum alloy, wherein the structure of the cast aluminum alloy consists of an aluminum matrix in which alloy elements such as Si, Mg, Cu and the like are dissolved and eutectic Si, the content of Si is four percent, the content of Mg is one-fifth percent, the content of Cu is one-fifth percent, Zr and Cr are added, the content of Zr is three-sixth percent, the content of Cr is two-sixth percent, pure aluminum and intermediate alloy are prepared and placed in a furnace for melting, alloy furnace burden is uniformly distributed in the molten pool, the burden is flatly loaded, the temperature is raised after the burden is loaded, the overheating temperature is seven-hundred-forty ℃, the temperature is kept for ten minutes, C2CL6 is pressed in for degassing, the aluminum alloy is converted into liquid from solid, powdery solvent is spread on the surface to cover when the burden is softened and is placed on a bed, and the molten aluminum alloy is stirred in an electromagnetic stirring mode;

step two: refining the aluminum alloy melt, and removing gas, impurities and harmful elements from the melt to obtain excellent aluminum liquid;

step three: casting the molten aluminum into an aluminum alloy ingot, homogenizing, heating the aluminum alloy ingot after casting to a heat preservation temperature of six hundred ℃, and preserving heat for twenty hours;

step four: discharging, namely pulling the object placing plate (21) with the aluminum alloy cast ingot arranged at the upper end out of the furnace, and then placing the object placing plate (21) in the cooling box (1);

step five: the first cooling mechanism (2) and the second cooling mechanism (3) are subjected to air cooling and water cooling, and the third cooling mechanism (4) and the fourth cooling mechanism (5) are subjected to fog cooling to cool the aluminum alloy ingot.

2. The aluminum alloy ingot excellent in electric conductivity according to claim 1, wherein: first cooling body (2) are installed to inside one side of cooler bin (1), second cooling body (3) are installed to the inside opposite side of cooler bin (1), third cooling body (4) are installed on the inside top of cooler bin (1), fourth cooling body (5) are installed to the inside bottom of cooler bin (1).

3. The aluminum alloy ingot excellent in electric conductivity according to claim 1, wherein: the first cooling mechanism (2) and the second cooling mechanism (3) both comprise a water cooling plate (6) and an air cooling plate (7), and the air cooling plate (7) is connected with the water cooling plate (6) through bolts.

4. The aluminum alloy ingot excellent in electric conductivity according to claim 1, wherein: the inside mounting of water-cooling board (6) has cooling water circulating pipe (9), the one end of cooling water circulating pipe (9) is provided with inlet (10), the other end of cooling water circulating pipe (9) is provided with back liquid mouth (11).

5. The aluminum alloy ingot excellent in electric conductivity according to claim 1, wherein: the air cooling plate (7) comprises two cooling fans (8), and the number of the cooling fans (8) is two.

6. The aluminum alloy ingot excellent in electric conductivity according to claim 1, wherein: third cooling body (4) and fourth cooling body (5) include mounting panel (12), fog cold plate (13) are installed to the lower extreme of mounting panel (12), a plurality of fog cold spray nozzles (14) are installed to the lower extreme of fog cold plate (13).

7. The aluminum alloy ingot excellent in electric conductivity according to claim 1, wherein: the upper end of the cooling box (1) is provided with a compressed air tank (15), a cooling liquid storage tank (16), a gas-liquid mixing tank (17) and a pump body (18), and both ends of the pump body (18) are provided with fog cooling pipes (19).

8. The aluminum alloy ingot excellent in electric conductivity according to claim 1, wherein: base station (20) are all installed to the inside both sides of cooler bin (1), thing board (21) are installed to the upper end of base station (20), slider (22) are all installed to the both sides of putting thing board (21) lower extreme, the upper end of base station (20) is provided with spout (23), and inside of slider (22) embedding spout (23), and spout (23) and slider (22) sliding connection.

9. The aluminum alloy ingot excellent in electric conductivity according to claim 1, wherein: the upper end of the object placing plate (21) is provided with a plurality of through grooves (24).

10. The aluminum alloy ingot excellent in electric conductivity according to claim 1, wherein: a plurality of fins (25) are arranged between the water cooling plate (6) and the air cooling plate (7).

Technical Field

The invention relates to the technical field of aluminum alloy ingots, in particular to an aluminum alloy ingot with excellent conductivity and a production process thereof.

Background

The method is characterized in that a high-quality aluminum alloy cast ingot with excellent performances such as high purity, high strength, high toughness, corrosion resistance and the like is obtained by methods such as purification, grain refining, homogenization, nonequilibrium and the like in the casting process, is a key technology for casting development, is used as the conductivity of one of electrical performance indexes of a metal material, not only reflects the conductivity of the material, but also is related to the components and internal tissues of the material, and the conductivity of the aluminum alloy cast ingot is second to that of silver and copper.

However, the existing aluminum alloy ingot has the problem of low conductivity in the production process, and cannot meet the design requirements, so that the existing requirements are not met, and the aluminum alloy ingot with excellent conductivity is provided.

Disclosure of Invention

The invention aims to provide an aluminum alloy ingot with excellent conductivity and a production process thereof, and aims to solve the problems that the conventional aluminum alloy ingot proposed in the background art has low conductivity in the production process and cannot meet the design requirements.

In order to achieve the purpose, the invention provides the following technical scheme: an aluminum alloy ingot with excellent conductivity is processed by a cooling box, and the cooling box comprises a first cooling mechanism, a second cooling mechanism, a third cooling mechanism, a fourth cooling mechanism, a water cooling plate, an air cooling plate, a cooling fan, a cooling water circulating pipe, a liquid inlet, a liquid return port, a mounting plate, a mist cooling nozzle, a compressed air tank, a cooling liquid storage tank, a gas-liquid mixing tank, a pump body, a mist cooling pipe, a base platform, a storage plate, a sliding block, a sliding chute, a through groove and fins;

the production process of the aluminum alloy ingot with excellent conductivity comprises the following steps:

the method comprises the following steps: smelting an aluminum alloy, wherein the structure of the cast aluminum alloy consists of an aluminum matrix in which alloy elements such as Si, Mg, Cu and the like are dissolved and eutectic Si, the content of Si is four percent, the content of Mg is one-fifth percent, the content of Cu is one-fifth percent, Zr and Cr are added, the content of Zr is three-sixth percent, the content of Cr is two-sixth percent, pure aluminum and intermediate alloy are prepared and placed in a furnace for melting, alloy furnace burden is uniformly distributed in the molten pool, the burden is flatly loaded, the temperature is raised after the burden is loaded, the overheating temperature is seven-hundred-forty ℃, the temperature is kept for ten minutes, C2CL6 is pressed in for degassing, the aluminum alloy is converted into liquid from solid, powdery solvent is spread on the surface to cover when the burden is softened and is placed on a bed, and the molten aluminum alloy is stirred in an electromagnetic stirring mode;

step two: refining the aluminum alloy melt, and removing gas, impurities and harmful elements from the melt to obtain excellent aluminum liquid;

step three: casting the molten aluminum into an aluminum alloy ingot, homogenizing, heating the aluminum alloy ingot after casting to a heat preservation temperature of six hundred ℃, and preserving heat for twenty hours;

step four: discharging, namely pulling the object placing plate with the aluminum alloy ingot at the upper end out of the furnace, and then placing the object placing plate in the cooling box;

step five: the first cooling mechanism and the second cooling mechanism are used for air cooling and water cooling, and the third cooling mechanism and the fourth cooling mechanism are used for fog cooling to cool the aluminum alloy ingot.

In a further embodiment, a first cooling mechanism is installed on one side of the interior of the cooling box, a second cooling mechanism is installed on the other side of the interior of the cooling box, a third cooling mechanism is installed on the top end of the interior of the cooling box, and a fourth cooling mechanism is installed on the bottom end of the interior of the cooling box.

In a further embodiment, the first cooling mechanism and the second cooling mechanism each include a water cooling plate and an air cooling plate, and the air cooling plate and the water cooling plate are connected by bolts.

In a further embodiment, a cooling water circulating pipe is installed inside the water cooling plate, a liquid inlet is formed in one end of the cooling water circulating pipe, and a liquid return port is formed in the other end of the cooling water circulating pipe.

In a further embodiment, the air cooling plate comprises two cooling fans.

In a further embodiment, the third cooling mechanism and the fourth cooling mechanism comprise a mounting plate, a fog cooling plate is mounted at the lower end of the mounting plate, and a plurality of fog cooling nozzles are mounted at the lower end of the fog cooling plate.

In a further embodiment, the upper end of the cooling box is provided with a compressed air tank, a cooling liquid storage tank, a gas-liquid mixing tank and a pump body, and the two ends of the pump body are provided with fog cooling pipes.

In a further embodiment, the base station is all installed to the inside both sides of cooler bin, the thing board is installed to the upper end of base station, the slider is all installed to the both sides of putting the thing board lower extreme, the upper end of base station is provided with the spout, and the inside of slider embedding spout, and spout and slider sliding connection.

In a further embodiment, the upper end of the object placing plate is provided with a plurality of through grooves.

In a further embodiment, a plurality of fins are arranged between the water cooling plate and the air cooling plate.

Compared with the prior art, the invention has the beneficial effects that:

1. the first cooling mechanism and the second cooling mechanism are respectively formed by combining a water cooling structure and an air cooling structure, the third cooling mechanism and the fourth cooling mechanism are fog cooling mechanisms, the four cooling mechanisms carry out omnibearing cooling on the aluminum alloy cast ingot, and the combination of multiple cooling modes accelerates the cooling of the aluminum alloy cast ingot, shortens the cooling time of the aluminum alloy cast ingot, improves the cooling speed during homogenization and further improves the conductivity of the aluminum alloy cast ingot;

2. the upper end of the object placing plate is provided with the plurality of through grooves, the third cooling mechanism and the fourth cooling mechanism are respectively positioned above and below the object placing plate, and when the third cooling mechanism and the fourth cooling mechanism work for fog cooling, the third cooling mechanism and the fourth cooling mechanism can be fully contacted with the surface of an aluminum alloy ingot, so that the cooling uniformity of the aluminum alloy ingot is improved, the cooling speed during homogenization is further improved, and the conductivity of the aluminum alloy ingot is improved;

2. the Si, Mg, Cu, Zr and Cr elements of the invention have influence on the strength, hardness and electrical conductivity of the alloy, the addition of Cu can improve the tensile strength and fatigue strength of the alloy, improve the cutting processability of the alloy and improve the surface smoothness without reducing the castability of the alloy, the existence of Cu increases the rigidity of crystals, weakens the thermal vibration of the crystals, the second phase of the Cu is separated out after heat treatment, improves the regularity of an ionic electric field, the Mg element in the alloy generates Mg2Si strengthening phase through aging strengthening, the mechanical property and electrical conductivity of the alloy are improved, the uniform separation of solute atoms increases the uniformity and purity of a matrix, and reduces the lattice distortion and the scattering of electronic waves, thereby improving the electrical conductivity of the alloy and meeting the requirements of high strength and high electrical conductivity, trace Zr can refine crystal grains, and the quenching sensitivity, hardness and electrical conductivity of the alloy, The fracture toughness, the stress corrosion resistance and the recrystallization resistance are all influenced, but the conductivity of the alloy is not influenced, and the addition of Cr plays a role in dispersion strengthening, so that the mechanical property of the alloy is improved.

Drawings

FIG. 1 is a schematic view of the structure of the cooling box of the present invention;

FIG. 2 is a schematic diagram of the first cooling mechanism and the second cooling mechanism of the present invention;

FIG. 3 is a schematic view showing the construction of a cooling water circulation pipe according to the present invention;

FIG. 4 is a schematic structural diagram of a third cooling mechanism and a fourth cooling mechanism of the present invention;

fig. 5 is a top view of the shelf of the present invention.

In the figure: 1. a cooling tank; 2. a first cooling mechanism; 3. a second cooling mechanism; 4. a third cooling mechanism; 5. a fourth cooling mechanism; 6. a water-cooling plate; 7. an air-cooled panel; 8. a cooling fan; 9. a cooling water circulation pipe; 10. a liquid inlet; 11. a liquid return port; 12. mounting a plate; 13. a fog cooling plate; 14. a mist cooling nozzle; 15. a compressed air tank; 16. a coolant storage tank; 17. a gas-liquid mixing tank; 18. a pump body; 19. a fog cooling pipe; 20. a base station; 21. a storage plate; 22. a slider; 23. a chute; 24. a through groove; 25. and a fin.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1-5, an embodiment of the present invention is shown: an aluminum alloy ingot with excellent conductivity is processed by a cooling box 1, wherein the cooling box 1 comprises a first cooling mechanism 2, a second cooling mechanism 3, a third cooling mechanism 4, a fourth cooling mechanism 5, a water cooling plate 6, an air cooling plate 7, a cooling fan 8, a cooling water circulating pipe 9, a liquid inlet 10, a liquid return port 11, a mounting plate 12, a fog cooling plate 13, a fog cooling nozzle 14, a compressed air tank 15, a cooling liquid storage tank 16, a gas-liquid mixing tank 17, a pump body 18, a fog cooling pipe 19, a base station 20, a storage plate 21, a sliding block 22, a sliding chute 23, a through groove 24 and fins 25;

the production process of the aluminum alloy ingot with excellent conductivity comprises the following steps:

the method comprises the following steps: smelting an aluminum alloy, wherein the structure of the cast aluminum alloy consists of an aluminum matrix in which alloy elements such as Si, Mg, Cu and the like are dissolved and eutectic Si, the content of Si is four percent, the content of Mg is one-fifth percent, the content of Cu is one-fifth percent, Zr and Cr are added, the content of Zr is three-sixth percent, the content of Cr is two-sixth percent, pure aluminum and intermediate alloy are prepared and placed in a furnace for melting, alloy furnace burden is uniformly distributed in the molten pool, the burden is flatly loaded, the temperature is raised after the burden is loaded, the overheating temperature is seven-hundred-forty ℃, the temperature is kept for ten minutes, C2CL6 is pressed in for degassing, the aluminum alloy is converted into liquid from solid, powdery solvent is spread on the surface to cover when the burden is softened and is placed on a bed, and the molten aluminum alloy is stirred in an electromagnetic stirring mode;

step two: refining the aluminum alloy melt, and removing gas, impurities and harmful elements from the melt to obtain excellent aluminum liquid;

step three: casting the molten aluminum into an aluminum alloy ingot, homogenizing, heating the aluminum alloy ingot after casting to a heat preservation temperature of six hundred ℃, and preserving heat for twenty hours;

step four: discharging, namely pulling the object placing plate 21 with the aluminum alloy cast ingot arranged at the upper end out of the furnace, and then placing the object placing plate 21 in the cooling box 1;

step five: the first cooling mechanism 2 and the second cooling mechanism 3 are subjected to air cooling and water cooling, and the third cooling mechanism 4 and the fourth cooling mechanism 5 are subjected to mist cooling to cool the aluminum alloy ingot.

Further, first cooling body 2 is installed to 1 inside one side of cooler bin, second cooling body 3 is installed to 1 inside opposite side of cooler bin, third cooling body 4 is installed on 1 inside top of cooler bin, fourth cooling body 5 is installed to 1 inside bottom of cooler bin, first cooling body 2, second cooling body 3, third cooling body 4 and fourth cooling body 5 adopt water-cooling, air-cooling and fog cold, cool off the aluminum alloy ingot casting comprehensively, multiple cooling methods make up and use the cooling of accelerating the aluminum alloy ingot casting, shorten the cooling time of aluminum alloy ingot casting, the cooling rate when improving the homogeneity, thereby improve the conductivity of aluminum alloy ingot casting.

Further, first cooling body 2 and second cooling body 3 all include water-cooling board 6 and air-cooling board 7, and air-cooling board 7 passes through bolted connection with water-cooling board 6, and connected mode is simple, installs and removes the convenience, does benefit to and maintains and change, and air-cooling board 7 during operation can blow out cold wind, and water-cooling board 6 can reduce the air-out temperature of air-cooling board 7.

Further, a cooling water circulating pipe 9 is installed inside the water cooling plate 6 to cool the aluminum alloy ingot, a liquid inlet 10 is formed in one end of the cooling water circulating pipe 9, a liquid return port 11 is formed in the other end of the cooling water circulating pipe 9, cooling water is introduced into the cooling water circulating pipe 9 of the first cooling mechanism 2 and the second cooling mechanism 3, the temperature of the water cooling plate 6 is reduced, heat exchange is conducted, and cooling water after heat exchange flows back through the liquid return port 11.

Further, the air cooling plate 7 comprises two cooling fans 8, the two cooling fans 8 work to generate cold air, and the cold air blows to the surface of the aluminum alloy ingot to cool the aluminum alloy ingot.

Further, the third cooling mechanism 4 and the fourth cooling mechanism 5 comprise a mounting plate 12, a fog cooling plate 13 is mounted at the lower end of the mounting plate 12, a plurality of fog cooling nozzles 14 are mounted at the lower end of the fog cooling plate 13, and the fog cooling area is large and the effect is good.

Further, a compressed air tank 15, a coolant storage tank 16, a gas-liquid mixing tank 17 and a pump body 18 are mounted at the upper end of the cooling box 1, mist cooling pipes 19 are mounted at both ends of the pump body 18, a trace amount of liquid is mixed into the pressure air flow to form a mist-like gas-liquid two-phase fluid, and the mist-like gas-liquid two-phase fluid is sprayed by a mist cooling nozzle 14 to generate jet flow and is sprayed to the surface of the aluminum alloy ingot.

Further, base station 20 is all installed to the inside both sides of cooler bin 1, and thing board 21 is installed to the upper end of base station 20, and slider 22 is all installed to the both sides of putting thing board 21 lower extreme, and the upper end of base station 20 is provided with spout 23, and the inside of slider 22 embedding spout 23, and spout 23 and slider 22 sliding connection, and it is convenient to get the material blowing to the aluminum alloy ingot casting, can take out the aluminum alloy ingot casting fast after handling the completion.

Further, the upper end of the object placing plate 21 is provided with a plurality of through grooves 24, and when the third cooling mechanism 4 and the fourth cooling mechanism 5 work to perform mist cooling, the object placing plate can be fully in surface contact with an aluminum alloy ingot, so that the cooling efficiency is improved.

Further, a plurality of fins 25 are installed between the water cooling plate 6 and the air cooling plate 7, heat transfer efficiency is improved, the water cooling plate 6 is connected with the fins 25 in a welded mode, the connection mode is simple, structural integrity is good, and damage is avoided.

The working principle is as follows: when in use, the furnace is charged firstly, an aluminum ingot and a large material are loaded in the middle, the intermediate alloy is loaded finally, the intermediate alloy with easily oxidized melting point is loaded in the middle and lower layers, furnace burden is uniformly distributed in a molten pool and is flatly loaded to prevent overweight, the temperature can be raised after the furnace burden is loaded, the aluminum alloy is changed from solid state to liquid state, powdery solvent is spread on the surface to cover when the furnace burden is softened and falls down, metal is placed for oxidation, an oxidation film entering a melt is reduced, an electromagnetic stirring mode is adopted to stir the aluminum alloy melt, the aluminum alloy melt is arranged at the furnace bottom and is not contacted with the high-temperature melt, the trouble of daily maintenance is avoided, the stirring direction can be changed by utilizing the switching of a switch, the stirring strength can be changed by adjusting the electric potential, stable and regular stirring can be carried out, the components of the aluminum alloy melt can be rapidly homogenized, the production quality of the aluminum alloy ingot is improved, and the surface temperature of the metal melt is reduced, the method has the advantages that the oxidation loss of metal is reduced, the heat loss in the furnace can be inhibited, the smelting and stirring time is shortened, the production efficiency of the aluminum alloy cast ingot is improved, after the melt is processed, refining is carried out, gas, impurities and harmful elements are removed from the melt, excellent aluminum liquid is obtained, the aluminum liquid is cast into the aluminum alloy cast ingot, homogenizing treatment is carried out, the temperature of the aluminum alloy cast ingot after casting is raised to the heat preservation temperature of six hundred ℃, the aluminum alloy cast ingot is preserved for twenty hours, then the aluminum alloy cast ingot is taken out of the furnace, the object placing plate 21 with the aluminum alloy cast ingot arranged at the upper end is pulled out of the furnace, the object placing plate 21 is arranged in the cooling box 1, cooling water is introduced into the cooling water circulating pipes 9 of the first cooling mechanism 2 and the second cooling mechanism 3, the cooling fan 8 of the air cooling plate 7 works to generate cold air, the cold air is blown to the surface of the aluminum alloy cast ingot, the third cooling mechanism 4 and the fourth cooling mechanism 5 work to mix trace liquid pressure into the air flow, forming a mist-like gas-liquid two-phase fluid, spraying the mist to the surface of the aluminum alloy cast ingot through the mist cooling nozzle 14 to generate jet flow, spraying the jet flow to the surface of the aluminum alloy cast ingot, arranging a plurality of through grooves 24 at the upper end of the object placing plate 21, respectively positioning the third cooling mechanism 4 and the fourth cooling mechanism 5 above and below the object placing plate 21, when third cooling body 4 and the 5 work of fourth cooling body carry out the fog cold, can fully with the surface contact of aluminum alloy ingot casting, first cooling body 2 and second cooling body 3 form by water-cooling structure and the combination of air-cooling structure, third cooling body 4 and fourth cooling body 5 are the fog cold body, four cooling body carry out all-round cooling to the aluminum alloy ingot casting, multiple cooling methods use in combination accelerates the cooling to the aluminum alloy ingot casting, shorten the cooling time of aluminum alloy ingot casting, cooling rate when improving the homogeneity, thereby improve the conductivity of aluminum alloy ingot casting.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.