A deformed magnesium alloy plate with good strength and plasticity matching and its preparation method

Abstract

The invention discloses a deformed magnesium alloy sheet with good matching of strength and plasticity and a preparation method, which comprises the following steps: S1, cryogenic treatment + low-speed rolling + annealing, cryogenic treatment of non-basal texture deformed magnesium alloy sheet for 0.5~ 2h, after the cryogenic treatment is completed, low-speed rolling is carried out, and then placed in the air to naturally return to room temperature, and then recovery annealing treatment and quenching are carried out; S2, cryogenic treatment + high-speed rolling + annealing, the deformed magnesium alloy sheet after S1 treatment is deep Cold treatment is carried out for 0.5~2h. After the cryogenic treatment is completed, high-speed rolling is carried out, and then it is placed in the air to naturally return to room temperature, and then recovery annealing treatment and quenching are carried out to obtain a deformed magnesium alloy sheet with good matching strength and plasticity. It can significantly improve the strength by introducing a large number of parallel or intersecting {10-12} tensile twins inside the sheet while retaining the non-basal texture characteristics of the deformed magnesium alloy sheet, and finally realize the non-basal texture. The strength and plasticity of the deformed magnesium alloy sheet are well matched.

Description

technical field [0001] The invention relates to the technical field of metal plate rolling, in particular to a deformed magnesium alloy plate with good strength and plasticity matching and a preparation method thereof. Background technique [0002] Under the background of reducing the weight of components to achieve low carbon dioxide emissions, wrought magnesium alloy sheets with low density, high specific strength and specific stiffness have huge market demand and application prospects in the automotive industry and aerospace fields. However, due to the hexagonal close-packed crystal structure of wrought magnesium alloy sheets, the independent slip system at room temperature is limited, which makes the plastic deformation ability of wrought magnesium alloy sheets at room temperature poor. In addition, wrought magnesium alloy sheets tend to form a strong basal texture during processing and preparation, which leads to difficulties in subsequent forming and processing, which ...

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Problems solved by technology

However, the study by Denghui Song et al. in "Denghui Song et al. Improved stretch formability of AZ31 sheet via texturecontrol by introducing a continuous bending channel into equal channel angular rolling, Journal of Materials Processing Technology" showed that the special non-based material prepared by ECAR-CB-A process The surface-textured AZ31 magnesium alloy sheet shows a significant decrease in strength in terms of mechanical properties, and its yield strength is only about 74MPa when stretched along the rolling direction RD, which is significantly lower than the yield strength of the commonly used base surface-textured AZ31 magnesium alloy sheet strength

[0004] It is well known that the reduction of the strength of the magnesium alloy sheet will restrict the application range of its formed parts, which means that although the special non-basal texture can significantly improve the plastic deformation ability of the sheet at room temperature, it basically eliminates the effect of the basal texture on the plastic deformation of the sheet at room temperature. However, if the strength of the plate cannot be effectively improved, high-performance magnesium alloy plates with matching strength and plasticity cannot be prepared, and thus cannot meet the needs of industrial applications.

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