High-strength and high-plasticity magnesium alloy material and preparation method thereof

Abstract

The present invention relates to a high-strength and high-plasticity magnesium alloy material and a preparation method thereof. The alloy material comprises the following components, by weight: 0.5-3.Swt% of Nd, 0.2-1.2wt% of Ga, 1.5 -4.5wt% of Zr, 0.1-1.0wt% of Zn; impurity elements comprising no more than 0.02wt% of Al, no more than 0.05wt% of Mn, no more than 0.01wt% of Fe, no more than 0.05wt% of Si, no more than 0.001wt% of Cu, no more than 0.001wt% of Ni and no more than 0.05v% of other impurity elements; and the balance of Mg. The preparation method comprises steps of: heating pure magnesium and pure Zn in an industrial line-frequency induction melting furnace to higher than 400 DEG C and introducing argon at 1-2.0L / min for protection; heating to 720+/-10 DEG C; insulating for 15-30 m to completely melt the metal materials; insulating for 20min after melting; successively adding a piece of Mg-Nd intermediate alloy and a piece of Mg-Ga intermediate alloy; insulating for 10-15 min after melting; adding a piece of Mg-Zr intermediate alloy; and insulating for 3-5 min after melting. The invention has the following advantages: raw materials have wide sources; and the high-strength and high-plasticity magnesium alloy material, with mechanical properties at room temperature reaching Rm no less than 350MPa and A no less than 12%, is prepared through alloying scientific formula design of Zn, Nd, Ga and Zr, and rolling and heat treatment.

Description

technical field [0001] The invention relates to a high-strength and high-plasticity magnesium alloy material and a preparation method thereof, and belongs to the technical field of non-ferrous metal alloys and preparation thereof. Background technique [0002] Magnesium alloy material is currently the lightest metal material in engineering applications, with small specific gravity, high specific strength, high specific stiffness, good electrical and thermal conductivity, good shock absorption, good electromagnetic shielding, easy cutting, easy recycling, etc. With these advantages, it is widely used in aviation, aerospace, automobiles, ships, and electronic information products, and has become the most promising metal material in the 21st century. At present, the most widely used ones are AZ91D magnesium alloy used in the foundry industry, and deformed magnesium alloys AZ31, AZ61, AZ80, ZK60 used in profiles and plates. However, the existing magnesium alloy materials have l...

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Problems solved by technology

However, the research results of these universities, research institutes and enterprises have common shortcomings, that is, the rare earth content in magnesium alloy is relatively high, basically reaching more than 20%, and the plasticity is poor, basically below 5%.

The high content of rare earth elements leads to high material cost and poor market competitiveness; poor plasticity limits its application field and scope

The combination of these factors has led to the fact that these materials are still in the laboratory stage, and it is difficult to produce in large quantities. At the same time, magnesium alloys with high strength and high plasticity have yet to be further developed.

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