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首页> 外文期刊>Philosophical Magazine Letters >The effects of yttrium on the {10-12} twinning behaviour in magnesium alloys: a molecular dynamics study
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The effects of yttrium on the {10-12} twinning behaviour in magnesium alloys: a molecular dynamics study

机译：钇对镁合金中{10-12}孪生行为的影响：分子动力学研究

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摘要

{10-12} twinning is one of the most important deformation modes in magnesium alloys. It is supposed that with high density of {10-12} twin boundaries, magnesium alloys might show exceptional mechanical properties. In this work, the effects of randomly distributed yttrium (Y) on the {10-12} twinning behaviour in magnesium alloys are investigated. Addition of Y makes it easier to activate {10-11} < 11-23 > dislocations and {10-12} twins, compared with pure Mg. Two types (type I and type II) of bi-crystal were constructed to investigate the Y effects on the migration of {10-12} twin boundaries. For the type I bi-crystals, the tensile stress is parallel to the [0001] lattice vector of the matrix. In this case, Y atoms facilitate the migration of {10-12} twin boundary. For the type II bi-crystals, the tension direction is set as the bisector of the angle between [-1011] and [10-10] lattice vector of the matrix. In this case, owing to the activation of basal slip, {10-12} twin could be consumed by sequential basal stacking faults. In other words, the effect of Y on the migration of {10-12} twin boundaries depends on the loading direction.
机译：{10-12} Twinning是镁合金中最重要的变形模式之一。假设具有高密度的{10-12}双界，镁合金可以显示出卓越的机械性能。在这项工作中，研究了随机分布的钇（Y）对镁合金中的{10-12}孪晶行为的影响。与纯mg相比，添加y使得{10-11} <11-23>脱位和{10-12}双胞胎更容易。构建双晶的两种类型（I型和II型）以研究对{10-12}双界限的迁移的y效应。对于I型Bi晶体，拉伸应力平行于基质的晶格载体。在这种情况下，Y原子有助于迁移{10-12}双边界。对于II型Bi晶体，张紧方向被设定为基质的[10-10]晶格载体之间的角度的分角。在这种情况下，由于基底滑移的激活，{10-12}可以通过顺序基底堆叠故障消耗。换句话说，Y对{10-12}双界的迁移的影响取决于装载方向。

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