Preparation process of high toughness magnesium alloy

Abstract

The invention relates to a preparation process of a high toughness magnesium alloy and belongs to the field of metal materials. The process specifically comprises the following steps: (1) preheating amold to 100-400 DEG C; (2) pouring magnesium alloy melt into the preheated mold to condense the magnesium alloy, specifically, in the integral process, a rotary magnetic field can be applied at the same time, and the magnetic field strength is 0.5-5T; (3) insulating the condensed magnesium alloy at 390-420 DEG C for 6-48 h for solution treatment; and (4) quenching the magnesium alloy after solution treatment to obtain the high toughness magnesium alloy. According to the process method, the tissues and mechanical properties of the magnesium alloy are obviously improved by applying the rotary magnetic field and the solution treatment, the demand on actual applications is met, the process is simple, and actual applications are facilitated. The preparation process provided by the invention issuitable for relatively more types of magnesium alloys, the mechanical properties of the magnesium alloy are improved obviously, and the actual application demand can be met.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a preparation process of a high-toughness magnesium alloy. Background technique [0002] Compared with traditional structural materials, magnesium alloy has high specific strength, good rigidity, good impact resistance and wear resistance, good resistance to electromagnetic wave interference, good electromagnetic shielding, and low manufacturing energy consumption, especially during thermal processing. Therefore, it is known as the "green" engineering material in the 21st century. However, due to its low plasticity, magnesium alloy materials are difficult to plastically deform at room temperature. This shortcoming makes it less widely used than other metal materials. [0003] Patent [CN201010003724] discloses an AZ series magnesium beryllium rare earth alloy material and its preparation method. The process is to add RE and Be to the AZ series alloy, and perform rolling...

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Problems solved by technology

However, due to its low plasticity, magnesium alloy materials are difficult to plastically deform at room temperature. This shortcoming makes its application less extensive than other metal materials.

[0003] Patent [CN201010003724] discloses an AZ series magnesium beryllium rare earth alloy material and its preparation method. The process is to add RE and Be to the AZ series alloy, and perform rolling and T4 heat treatment. The tensile strength reaches 300-360MPa, The elongation rate reaches 8-20%. This process obviously improves the mechanical properties, but it needs to process and add rare earth elements, which is expensive and cumbersome; the patent [CN201410294856] discloses a homogenization annealing process to improve the comprehensive properties of AZ91 magnesium alloy. The process is to homogenize the AZ91 magnesium alloy at 390°C for 16 hours and then cool it. The tensile strength reaches 140-175MPa and the elongation reaches 3-4.5%. This process is simple, but the mechanical properties The improvement is not obvious; the patent [CN201610397649] provides a high-fluidity, high-strength and toughness cast magnesium alloy material, its composition includes Mg, Zn, Ce, Nd, Ag, Zr, Fe, Ni, Cu, and its process is carried out after smelting Solution and aging treatment, the tensile strength reaches 300-350MPa, and the elongation reaches 8%-11%. The smelting process of this process is cumbersome, and precious metals such as Ce and Ag need to be added, and the operation is complicated; the patent [CN201610398539] provides A high-strength and toughness casting magnesium alloy heat treatment method is proposed. The alloy used is magnesium-rare earth-zirconium-zinc (silver) magnesium alloy. Set it to 0.14-0.155MPa, and set the solution treatment temperature to 500-510°C. After heat preservation, exhaust, nitrogen gas and quenching with engine oil, the tensile strength can reach 350MPa, and the elongation can reach 11%. This process is relatively simple. But there are few types of magnesium alloys

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