Abstract We study the effect of solute segregation on pyramidal to basal transformation of 〈 c + a 〉 edge dislocations in a model Mg-Y alloy, using a hybrid Monte Carlo/Molecular Dynamics method. While a random solute distribution has no appreciable effect on this undesirable transition, a solute cloud around the dislocation slows and effectively prevents it in case of Mg-3 at % Y alloy. Comparing with the time scale required for diffusion of Y to the dislocation, suggests that segregation of Y and other fast diffusing elements can be engineered to prohibit this glissile to sessile transition, and stabilize the pyramidal glide of 〈 c + a 〉 dislocations.

中文翻译：

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溶质云的形成对 Mg-Y 固溶体中〈c+a〉边缘位错的二阶锥体到基底转变的影响

摘要 我们使用混合蒙特卡罗/分子动力学方法研究溶质偏析对模型 Mg-Y 合金中 〈 c + a 〉边缘位错的金字塔形到基底转变的影响。虽然随机溶质分布对这种不希望的转变没有明显影响，但在 Mg-3 at % Y 合金的情况下，位错周围的溶质云会减慢并有效地阻止它。与 Y 扩散到位错所需的时间尺度相比，表明 Y 和其他快速扩散元素的分离可以被设计来阻止这种滑动到固着的转变，并稳定 < c + a > 位错的金字塔形滑动。