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首页> 外文期刊>Materials Science and Engineering >Excellent superplastic properties achieved in Mg-4Y-3RE alloy in high strain rate regime
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Excellent superplastic properties achieved in Mg-4Y-3RE alloy in high strain rate regime

机译：高应变率制度的Mg-4Y-3RE合金中达到优异的超塑性。

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摘要

This study is focused on high strain rate superplasticity of commercial magnesium alloy Mg-4Y-3RE (WE43) in ultrafine-grained condition prepared by equal channel angular pressing (ECAP). Attaining microstructure with the average grain size of ～340 nm and high density of secondary phase particles provided a possibility to significantly decrease temperature during the deformation at strain rates of 10~(-2) s~(-1) and 10~(-1) s~(-1) in comparison with previous studies. Consequently, extent of negative effect of grain growth was partially suppressed and the investigated alloy did exhibit exceptionally high deformability with a maximum elongation of -1230% at strain rate of 10~(-2) s~(-1) and at two temperatures: 350 °C and 400 °C. Increase in the strain rate to 10~(-1) s~(-1) resulted in maximum elongation of ～1000% at the temperature of 400 °C. The microstructural analysis after the deformation showed that the microstructure was fine-grained even after large deformation and plasticity-controlled growth of cavities did occur only at the temperature of 450 °C. The optimization of ECAP processing resulted in very weak texture and, therefore, the deformability should be more isotropic in comparison with strongly textured materials usually investigated in this regard.
机译：该研究专注于通过等于沟道角压（ECAP）制备的超细粒化条件的商业镁合金Mg-4Y-3Re（We43）的高应变率超塑性。达到〜340nm的平均晶粒尺寸和高密度的二次相粒子的微观结构提供了在10〜（-2）S〜（-1）和10〜（-1）的应变率下的变形期间显着降低温度。 ）S〜（-1）与之前的研究相比。因此，部分抑制了晶粒生长的负面影响的程度，研究的合金具有出差高易变形性，最大伸长率为-1230％，以10〜（2）S〜（-1）和两个温度： 350°C和400°C。将应变率的增加至10〜（-1）S〜（-1），导致在400℃的温度下最大伸长率〜1000％。变形后的微观结构分析表明，即使在大量变形和腔室的塑性控制生长下也仅在450℃的温度下发生微观结构。 ECAP处理的优化导致质地非常弱，因此，与通常在这方面的强烈纹理的材料相比，可变形性应更加各向同性。

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