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首页> 外文期刊>Philosophical Magazine Letters >Strengthening and microstructure modification associated with moving twin boundaries in hcp metals
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Strengthening and microstructure modification associated with moving twin boundaries in hcp metals

机译：与hcp金属中移动双晶界相关的强化和微结构改性

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The interaction of a moving {10 (1) over bar2} twin boundary with clusters of self-interstitial atoms and vacancies, containing up to 35 point defects, has been studied by atomic computer simulation in a model crystal of alpha-zirconium. Conservative movement of the boundary has been achieved by glide of twinning dislocations of edge character under applied shear stress. Several reactions were observed, the result depending on cluster orientation and location relative to the glide plane of the twinning dislocation. They include: (i) restriction of twin boundary mobility; (ii) change of cluster orientation and shape; (iii) glissile cluster drag by the boundary without contact; and (iv) total or partial absorption of a cluster by the twin boundary and cluster drag, together with simultaneous glide along the interface. It is concluded that the applied shear stress for motion of twin boundaries is raised by interaction with point defect clusters. Furthermore, moving twin boundaries act as defect sinks or recombination centres and provide a means for removing defects from regions of radiation damage.
机译：通过原子计算机模拟在α-锆的模型晶体中研究了移动的{10（1）在bar2}孪晶边界上与自填隙原子和空位簇（最多包含35个点缺陷）的相互作用。边界的保守运动是通过在施加切应力的作用下边缘特征的孪生位错的孪生滑移而实现的。观察到几个反应，结果取决于簇取向和相对于孪生位错滑行平面的位置。它们包括：（i）限制双边界流动; （ii）改变簇的方向和形状; （iii）易碎团簇不受边界的拖曳; （iv）团簇被孪生边界和团簇阻力全部或部分吸收，同时沿界面同时滑动。结论是，与点缺陷簇的相互作用提高了双边界运动所施加的切应力。此外，移动的孪晶边界充当缺陷汇或复合中心，并提供了从辐射损伤区域去除缺陷的手段。

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