The effect of solute cloud formation on the second order pyramidal to basal transition of 〈c+a〉 edge dislocations in Mg-Y solid solutions
The effect of solute cloud formation on the second order pyramidal to basal transition of 〈c+a〉 edge dislocations in Mg-Y solid solutions
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DOI：
10.1016/j.scriptamat.2020.02.033
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发表时间：
2020-06
影响因子：
6
通讯作者：
Daniel Utt;A. Stukowski;M. Ghazisaeidi
中科院分区：
文献类型：
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作者：
Daniel Utt;A. Stukowski;M. Ghazisaeidi
用蒙特卡罗/分子动力学混合方法研究了溶质偏析对模型镁Y合金中<；c+a>；刃位错金字塔向基面转变的影响。虽然随机的溶质分布对这种不期望的转变没有明显的影响，但位错周围的溶质云减缓并有效地防止了这种转变，对于Mg-3at%Y合金。与Y扩散到位错所需的时间尺度进行了比较，表明Y和其他快速扩散元素的偏析可以阻止这种滑行到固位的转变，并稳定<；c+a>；位错的锥形滑移。
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.