阅读说明：本技术 一种适用于型材的镁合金及其制备方法 (Magnesium alloy suitable for section bar and preparation method thereof ) 是由 张娅 陈秋荣 周学华 于 2019-11-18 设计创作，主要内容包括：本发明提供了一种适用于型材的镁合金,按照重量百分数,其组成如下：Al 3.0～4.0wt％,Zn：1.0～2.0wt％,Nd：0.5～1.0wt%,Zr：0.5～1.0wt%,Mn：0.2～0.4wt％,杂质：<0.2wt%,余量为Mg。本发明的变形镁合金设计在低铝镁合金的基础上添加少量Nd和Zr等合金元素,在保证合金变形加工难度和成本增加不多的基础上,进一步提高合金的强度和耐蚀能力。(The invention provides a magnesium alloy suitable for sectional materials, which comprises the following components in percentage by weight: 3.0-4.0 wt% of Al, Zn: 1.0-2.0 wt%, Nd: 0.5 to 1.0wt%, Zr: 0.5-1.0 wt%, Mn: 0.2-0.4 wt%, impurities: <0.2wt%, the balance being Mg. The wrought magnesium alloy disclosed by the invention is designed to add a small amount of alloy elements such as Nd, Zr and the like on the basis of low aluminum-magnesium alloy, and further improves the strength and corrosion resistance of the alloy on the basis of ensuring that the alloy is difficult to deform and the cost is not increased much.)

1. The magnesium alloy suitable for the section bar is characterized by comprising the following components in percentage by weight: 3.0-4.0 wt% of Al, Zn: 1.0-2.0 wt%, Nd: 0.5 to 1.0wt%, Zr: 0.5-1.0 wt%, Mn: 0.2-0.4 wt%, impurities: <0.2wt%, the balance being Mg.

2. The magnesium alloy for section bars as claimed in claim 1, wherein the magnesium alloy for section bars comprises the following components in percentage by weight: al: 3.0 wt%, Zn: 1.0wt%, Nd:0.6 wt%, Zr: 0.6wt%, Mn: 0.3 wt%, impurities: <0.2wt%, the balance being Mg.

3. The magnesium alloy for section bars as claimed in claim 1, wherein the magnesium alloy for section bars comprises the following components in percentage by weight: al: 3.5 wt%, Zn: 1.5 wt%, Nd:0.7 wt%, Zr: 0.6wt%, Mn: 0.3 wt%, impurities: <0.2wt%, the balance being Mg.

4. The magnesium alloy for section bars as claimed in claim 1, wherein the magnesium alloy for section bars comprises the following components in percentage by weight: al: 4.0 wt%, Zn: 2.0 wt%, Nd:1.0 wt%, Zr: 0.6wt%, Mn: 0.3 wt%, impurities: <0.2wt%, the balance being Mg.

5. A method for preparing a magnesium alloy for profiles as claimed in claims 1 to 4, characterized by comprising the following steps:

1) after the materials are mixed according to the mass percentage of the alloy, the mixture is smelted into the alloy;

2) the magnesium alloy product with high strength, high toughness and good corrosion resistance is prepared by adopting the processes of extrusion at 400 ℃ of 350 and drawing at 180 ℃ of 150.

Technical Field

The invention relates to a magnesium alloy suitable for sectional materials and a preparation method thereof, in particular to a low-aluminum-content Mg-Al-Zn-Nd-Zr wrought magnesium alloy with the aluminum content of 3.0-4.0 mass percent and a preparation method thereof.

Background

China is rich in magnesium resources and is the first magnesium-producing nation in the world with magnesium output. The development of the magnesium industry is also an important supporting point for the sustainable economic development of China, and the development of the deformed magnesium alloy can strongly promote the rapid development of the magnesium alloy industry and the magnesium component manufacturing and processing industry of China. However, the magnesium alloy section industry in China is still in the starting stage, because of the technical restriction of the magnesium alloy section forming process and equipment, the magnesium alloy section can only be produced into sections such as magnesium alloy plates, pipes, strips and the like with limited specifications in China, and the price is high, so that the magnesium alloy section is produced in small batches only by a very small number of enterprises such as Luoyang copper industry limited company, Hebei Jinbaike bicycle limited company and the like at present, and is mainly used for a few industries such as national defense war industry, bicycles and the like. In 1935, magnesium alloy sections are used for manufacturing important parts such as aircraft engine covers, lower fuselages, wing skins, fairings, oil tanks and the like in Germany; well-known companies such as siemens and schneider in germany have applied magnesium alloy profiles to a large number of industrial fields such as electronic communication, optical instruments, rail transit, automobiles and the like; truck and trailer bodies have been mass produced from magnesium alloy profiles developed by the dow chemical company, usa. Therefore, compared with the foreign countries, the magnesium alloy section industry in China has the problems of technical lag, low industrialization degree and the like.

At present, the magnesium alloy with good deformation performance and comprehensive mechanical property mainly comprises AZ31, ZK60, AM80 and the like which are applied more. Some high rare earth magnesium alloys that have been proven to have outstanding mechanical properties in the laboratory have not been used on a large scale due to poor deformability and high cost.

Chinese patent CN201310160069.6 provides a wrought magnesium alloy suitable for section bars and a preparation method thereof, wherein the composition of the magnesium alloy suitable for section bars is as follows: a1: 3.0-4.0 wt%, Zn: 0.5 to 1.0wt%, Zr: 0.5 to 1.0wt%, Mn: 0.2-0.4 wt%, impurities: less than 0.2wt%, and the balance being Mg. The invention relates to a novel Mg-Al-Zn alloy system alloy. The novel alloy forms Zr mass points by adding the element Zr to form hard and fine crystal cores to play a role in refining crystal grains, plays a role in fine grain strengthening and second phase strengthening in the wrought magnesium alloy and improves the mechanical property of the alloy, and the element Zr cooperates with the element A1 and Zn to improve the corrosion resistance of the alloy, so that the corrosion resistance and the mechanical property of the novel alloy are stronger than those of Mg-Al-Zn alloy with the same components.

Compared with patent CN201310160069.6, the rare earth element Nd is added in a small amount, Mg-Nd intermediate phase is formed in the alloy, granular hard mass points are formed, the granular hard mass points become effective crystallization cores in the deformation process, the dynamic recrystallization process is promoted to be fully carried out, the alloy grains after deformation are finer, and the toughness of the alloy is improved. Meanwhile, the fine Mg-Nd intermediate phase can form a second phase for strengthening, and the strength of the alloy is improved. The Mg-Nd intermediate phase has higher potential, and the addition of Nd has certain corrosion resistance.

Disclosure of Invention

The invention aims to provide a magnesium alloy suitable for sectional materials, which is a deformed magnesium alloy with good mechanical property and corrosion resistance of a Mg-Al-Zn alloy system.

The invention also aims to provide a preparation method of the magnesium alloy suitable for the section bar.

The technical scheme adopted by the invention is as follows:

the magnesium alloy suitable for the section comprises the following components in percentage by weight: 3.0-4.0 wt% of Al, Zn: 1.0-2.0 wt%, Nd: 0.5 to 1.0wt%, Zr: 0.5-1.0 wt%, Mn: 0.2-0.4 wt%, impurities: <0.2wt%, the balance being Mg.

Preferably, the first and second electrodes are formed of a metal,

the magnesium alloy suitable for the section comprises the following components in percentage by weight: al: 3.0 wt%, Zn: 1.0wt%, Nd:0.6 wt%, Zr: 0.6wt%, Mn: 0.3 wt%, impurities: <0.2wt%, the balance being Mg.

The magnesium alloy suitable for the section comprises the following components in percentage by weight: al: 3.5 wt%, Zn: 1.5 wt%, Nd:0.7 wt%, Zr: 0.6wt%, Mn: 0.3 wt%, impurities: <0.2wt%, the balance being Mg.

The magnesium alloy suitable for the section comprises the following components in percentage by weight: al: 4.0 wt%, Zn: 2.0 wt%, Nd:1.0 wt%, Zr: 0.6wt%, Mn: 0.3 wt%, impurities: <0.2wt%, the balance being Mg.

The preparation method of the magnesium alloy suitable for the section bar comprises the following steps:

1) after the materials are mixed according to the mass percentage of the alloy, the mixture is smelted into the alloy;

2) the magnesium alloy product with high strength, high toughness and good corrosion resistance is prepared by adopting the processes of extrusion at 400 ℃ of 350 and drawing at 180 ℃ of 150.

The inventor develops a novel Mg-Al-Zn alloy system alloy aiming at the problem that the corrosion resistance and the mechanical property of the existing wrought magnesium alloy can not be considered at the same time. The novel alloy forms an Mg-Nd precipitated phase and Zr mass points by adding elements Nd and Zr, causes hard and fine crystal cores, plays a role in refining crystal grains, plays a role in fine-grain strengthening and second-phase strengthening in the deformed magnesium alloy, and improves the mechanical property of the alloy. The corrosion potential of the Mg-Nd precipitated phase and Zr mass point is higher, and the corrosion resistance of the alloy is greatly improved by the synergistic effect of the Mg-Al phase and the Mg-Zn phase, so that the corrosion resistance and the mechanical property of the novel wrought magnesium alloy are stronger than those of the Mg-Al-Zn alloy with the same components.

The wrought magnesium alloy design of this patent adds alloy elements such as a small amount of Nd and Zr on low almag's basis, on guaranteeing that alloy deformation processing degree of difficulty and cost increase are not many, further improves the intensity and the corrosion resisting capability of alloy.

Drawings

FIG. 1 shows the metallographic morphology of the general AZ31 alloy (FIG. a), the magnesium alloys of examples 1-3 (FIGS. b, c and d) and the Mg-3Zn-1Al-Zr alloy in CN201310160069.6 (FIG. e). Wherein, the drawing a is the AZ31 alloy after deformation, the drawing b is the alloy of the embodiment 1, the drawing c is the alloy of the embodiment 2, the drawing d is the alloy of the embodiment 3, and the drawing e is the metallographic morphology of the Mg-3Zn-1Al-Zr alloy.

Detailed Description

The technical solution of the present invention is described in detail below. The embodiments of the present invention are provided only for illustrating a specific structure, and the scale of the structure is not limited by the embodiments.

Mechanical property test after deformation processing, part 1 of metal material tensile test: room temperature test method GB/T228.1-2010

Self-corrosion Rate test of metals and alloys Corrosion atmospheric Corrosion determination of the Corrosion Rate of Standard specimens used to evaluate Corrosion