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Study of the Microstructure of AZ31B Magnesium Alloy Under High Strain Rate Deformation

机译:高应变率变形下AZ31B镁合金的微观组织研究

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In order to investigate the microstructure evolution under high strain rate deformation of magnesium alloy, AZ31B magnesium alloy was impacted by Split Hopkinson Pressure Bar within the strain rates of 496s"' to 2120s"1, then the specimens were observed by optical microscopy. The results show that when the strain rate are relatively low (496s"'-964s"1), the microstructure is predominated by high density of twinning, while increase the strain rate to 2120s"1 the volume fraction of twins is decreased. This implies that at relatively lower strain rate the deformation mechanism of AZ31B magnesium alloy under impact loading is twinning; increasing the strain rate the prismatic slip and pyramidal slip may be active besides twinning.
机译:为了研究镁合金在高应变率变形下的微观组织演变,在496s“'至2120s” 1的应变率下,Split Hopkinson压力棒对AZ31B镁合金进行了冲击,然后用光学显微镜观察了样品。结果表明,当应变速率较低时(496s“-964s” 1),孪晶的高密度占主导地位,而当应变速率提高至2120s“ 1时,孪晶的体积分数降低。这意味着在较低的应变速率下,AZ31B镁合金在冲击载荷下的变形机理是孪生的;增加应变速率,除了孪晶外,棱柱滑动和角锥滑动也可能是活跃的。

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