Preparation method of high-damping Mg-Zn-Y-based composite material
阅读说明：本技术 一种高阻尼Mg-Zn-Y基复合材料的制备方法 (Preparation method of high-damping Mg-Zn-Y-based composite material ) 是由 万迪庆 王林森 刘雅娟 于 2020-05-22 设计创作，主要内容包括：本发明是一种通过在Mg-Zn-Y合金中加入304不锈钢丝,生成镁基复合材料的制备方法。本实验选用的基体材料为Mg<Sub>97</Sub>Zn<Sub>1</Sub>Y<Sub>2</Sub>镁合金,增强体为304不锈钢丝,采用铜模吸铸工艺制备而成。通过能谱分析确定其物相成分为α-Mg,长周期堆垛结构相(LPSO)及304不锈钢丝。304不锈钢丝/Mg97Zn1Y2合金具有高阻尼高强性能。本发明制备方法简单、操作简便、材料机械性能显著提升,而阻尼能力未有明显下降,有利于推动高阻尼镁基材料在航空、航天、交通等众多领域的广泛应用。(The invention relates to a preparation method for generating a magnesium-based composite material by adding 304 stainless steel wires into Mg-Zn-Y alloy. The matrix material selected for the experiment was Mg 97 Zn 1 Y 2 The magnesium alloy and the reinforcement are 304 stainless steel wires and are prepared by adopting a copper mold suction casting process, and the phase composition of the magnesium alloy is α -Mg, a long period stacking structure phase (LPSO) and 304 stainless steel wires are determined by energy spectrum analysis, and the 304 stainless steel wires/Mg 97Zn1Y2 alloy has high damping and high strength.)
1. A preparation method for improving the performance of Mg97Zn1Y2 magnesium alloy by adding 304 stainless steel wires is characterized in that the material contains uniformly distributed 304 stainless steel wires and LPSO phase.
2. A preparation method for improving the performance of Mg97Zn1Y2 magnesium alloy by adding 304 stainless steel wires according to claim 1, wherein the content of the 304 stainless steel wires is 5-15%.
3. A preparation method of the Mg97Zn1Y2 magnesium alloy according to claim 1 by adding 304 stainless steel wires, characterized in that the preparation method comprises the following steps:
(1) preparing materials: pure Mg (purity 99.95%), pure Zn (purity 99.9%), Mg-Y master alloy (Y content 25 wt%), 304 stainless steel wire with diameter 0.05 mm;
(2) smelting: preheating the crucible to 350 ℃, taking out the crucible, coating water glass on the inner surface and the outer surface, continuously putting the crucible back into the furnace for heating until the water glass is evaporated, taking out the crucible when the temperature is raised to 500 ℃, putting the pure magnesium block at the bottom of the crucible for continuously heating, and spraying a layer of covering agent; when the temperature is raised to 650 ℃, the magnesium block is melted, a furnace cover is opened to remove residues on the surface of the molten metal, then Mg-Y alloy is added, and a little covering agent is scattered; keeping the temperature at 720 ℃ for 10-20min, adding Zn after the Mg-Y metal blocks are completely melted, scattering a little covering agent, keeping the temperature for 5min, and opening a furnace cover to remove residues on the surface of the metal liquid;
(3) suction casting: a plurality of groups of 304 steel wires with the length of about half a meter are fixed in a red copper pipe with the diameter of 12mm, and suction casting molding is carried out by utilizing a vacuum suction casting device.
Technical Field
The invention relates to a new material forming technology, in particular to a 304 stainless steel wire reinforced Mg97Zn1Y2A preparation method of the base composite.
Background
The magnesium alloy has high specific strength and specific stiffness, excellent electric conductivity and thermal conductivity, and good damping vibration attenuation and electromagnetic shielding performance, and has wide application prospects in the fields of automobiles, communication, aerospace and the like, but has the defects of small elastic modulus, low high-temperature strength and creep resistance, poor wear resistance and the like, so that further industrial application of the magnesium alloy is greatly limited. Research shows that the mechanical property of the magnesium alloy can be improved by alloying, but the damping capacity of the magnesium alloy is greatly reduced, and the contradiction between the mechanical property and the damping capacity of the magnesium alloy can be well balanced by preparing the magnesium-based alloy.
The matrix material selected by the invention is Mg97Zn1Y2The alloy contains a special long-period stacking structure phase, has good contribution to the mechanical property and the damping property of the magnesium alloy, and has attracted the attention of researchers in recent years. The added reinforcing phase is 304 stainless steel wire, which has good mechanical property and higher toughness. The test sample is prepared by adopting a copper mold suction casting method, which is a common rapid solidification process, and has the advantages that the solid solution limit can be enlarged, so that the 304 steel wire and the magnesium alloy can be better combined, and in addition, the segregation phenomenon in the casting process can be eliminated by adopting the technology, so that the alloy has good mechanical properties.
By adding the 304 stainless steel wire into the alloy, due to the difference of the thermal expansion coefficients of the matrix and the 304 stainless steel wire, local stress can be generated near the 304 stainless steel wire in the solidification process, while the elastic modulus of the magnesium matrix is lower, so that residual strain is generated, the dislocation density is increased, and meanwhile, the inherent damping and the phase interface damping or the grain boundary damping of the 304 stainless steel wire are both beneficial to improving the damping capacity of the alloy. Therefore, the design of the high-damping magnesium-based material with good mechanical property can be realized in principle.
Disclosure of Invention
The invention provides a preparation method of a Mg-Zn-Y based composite material reinforced by adding 304 stainless steel wires, in particular to a method for preparing a high damping magnesium-based alloy containing 304 stainless steel wires by adopting a copper mold suction casting process.
Technical scheme
1. Sample preparation
(1) Preparing materials: pure Mg (purity 99.95%), pure Zn (purity 99.9%), Mg-Y master alloy (Y content 25 wt%), 304 stainless steel wire with a diameter of 0.05 mm.
(2) Smelting: preheating the crucible to 350 ℃, taking out the crucible, coating water glass on the inner surface and the outer surface, continuously putting the crucible back into the furnace for heating until the water glass is evaporated, taking out the crucible when the temperature is raised to 500 ℃, putting the pure magnesium block at the bottom of the crucible for continuously heating, and spraying a layer of covering agent. When the temperature rises to 650 ℃, the magnesium block is melted, a furnace cover is opened to remove residues on the surface of the molten metal, then Mg-Y alloy is added, and a little covering agent is scattered. And (3) keeping the temperature for 10-20min after the temperature is 720 ℃, adding Zn after the Mg-Y metal blocks are completely melted, scattering a small amount of covering agent, keeping the temperature for 5min, and opening a furnace cover to remove residues on the surface of the metal liquid.
(3) Suction casting: a plurality of groups of 304 steel wires with the length of about half a meter are fixed in a red copper pipe with the diameter of 12mm, and suction casting molding is carried out by utilizing a vacuum suction casting device.
2. Sample characterization
(1) Energy spectrum analysis
The result of the energy spectrum analysis of the sample shows that the main components of the material are as follows: alpha-Mg, long period stacking structure phase and 304 stainless steel wire.
(2) Mechanical Property test
The prepared magnesium-based material has the maximum tensile strength of 230MPa and the elongation of 8 percent.
(3) Damping performance test
The damping performance test is carried out on a dynamic mechanical analyzer (DMA-Q800), the sample is made into a standard sample of 50 multiplied by 5 multiplied by 1mm, the damping performance tan phi of the prepared material is larger than 0.01, and the prepared material belongs to a high-damping material.
Detailed Description