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The contributions of grain size, dislocation density and twinning to the strength of a magnesium alloy processed by ECAP

机译:ECAP处理的镁合金的晶粒尺寸,位错密度和孪晶对强度的贡献

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摘要

A ZK60 magnesium alloy was processed by equal-channel angular pressing (ECAP) for up to 8 passes at 473 K and the evolution of strength and microstructural parameters were determined using hardness testing and X-ray line profile analysis. The results show the subgrain size and twin boundary density increase between 1 and 2 passes and then decrease, the dislocation density continuously decreases up to 8 passes and the measured microhardness remains reasonably constant between 1 and 8 passes of ECAP. The results are interpreted using a model based on the additive effects of the dislocation density and an average size factor incorporating the effects of both the twin and the subgrain boundaries.
机译:ZK60镁合金在473 K下通过等通道角压(ECAP)加工了8次,强度和微观结构参数的变化通过硬度测试和X射线线轮廓分析确定。结果表明,在1和2遍之间,亚晶粒尺寸和孪晶边界密度增加,然后减小,位错密度连续降低,直至8遍,并且测得的显微硬度在ECAP的1和8遍之间保持合理的常数。使用基于位错密度和结合了孪晶和亚晶界的影响的平均尺寸因子的加和效应的模型来解释结果。

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