论文标题
通过镁合金中的无扩散攀爬溶质软化和空置产生
Solute softening and vacancy generation by diffusion-less climb in magnesium alloys
论文作者
论文摘要
使用分子动力学模拟观察到了MG-AL合金中<a>边缘位错的活跃室温扩散。关于棱柱形和锥体I平面的脱位爬过基底平面，以克服溶质障碍物。这种平面脱位运动使高电阻金字塔I滑行软化，并显着降低了位错迁移率的各向异性，并可以帮助改善MG的延展性。流动应力以溶质浓度线性缩放。位错主要沿负方向爬升，攀登角度为0.01cal，在10-4的阶段产生了非常高的空置浓度。
Active room temperature diffusion-less climb of the <a> edge dislocations in model Mg-Al alloys was observed using molecular dynamics simulations. Dislocations on prismatic and pyramidal I planes climb through the basal plane to overcome solute obstacles. This out-of-plane dislocation motion softens the high resistance pyramidal I glide and significantly reduces the anisotropy of dislocation mobility, and could help improve the ductility of Mg. The flow stress scales linearly with solute concentration, cAl. Dislocations climb predominantly in the negative direction, with climb angle on the order of 0.01cAl, producing very high vacancy concentration on the order of 10-4.
