A kind of preparation method and product of magnesium alloy with good room temperature plasticity

Abstract

The invention discloses a method for preparing a magnesium alloy with good room temperature plasticity, which comprises the following steps: taking Mg ingot with a purity of 99.9wt.%, Zn ingot with a purity of 99.9wt.%, Mg-30Y master alloy and Mg- The 30Zr intermediate alloy is put into the crucible for melting to obtain the alloy liquid; then the casting temperature is controlled, and the alloy liquid is cast into the graphite mold of the vacuum directional solidification equipment, and the insulation sleeve is kept warm; the pull-down is carried out by controlling the pulling speed of the pull-down system to promote casting The alloy grows on a specific preferential growth crystal plane, and finally solidifies to obtain a magnesium alloy. The method of the invention prepares a columnar grain structure in which the primary arms grow in parallel, the longitudinal grain boundaries are relatively straight, there is no transverse grain boundary, and there is a specific grain orientation, the preferential growth crystal plane is the growth direction, and the primary arm spacing is about 50 μm. The magnesium alloy σb is 188MPa at room temperature, and the elongation is as high as 24%.

Description

technical field [0001] The invention relates to a preparation method and product of a magnesium alloy with good room temperature plasticity, and specifically belongs to the technical field of alloy preparation. Background technique [0002] Lightweight has huge economic, environmental and social benefits to the automotive industry, high-speed railways, aerospace and other fields. Magnesium alloys, as the lightest metal structural materials, have great potential for lightweighting, and have attracted great interest and widespread attention from scholars all over the world from application development to basic research. [0003] Magnesium has a hexagonal close-packed (HCP) crystal structure, and its plastic deformation mechanism is basal plane, cylindrical plane, cone sliding and cone twinning. Base only at room temperature Two independent slip systems are activated, and there is no sufficient independent deformation mechanism that can coordinate the C-axis deformation, and ...

AI Technical Summary

Problems solved by technology

The most common twinning mechanism in magnesium alloys is stretch twins, compression twins and Secondary twins, in the research on twins in recent years, researchers mainly focus on The effect of tensile twinning and tensile twinning on the deformation and mechanical properties of magnesium alloys, but there are few research reports on the effects of compression twinning and secondary twinning on room temperature deformation and mechanical properties of magnesium alloys

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