Mobility of pinned twin boundaries during mechanical loading of extruded binary Mg-1Zn alloy
Mobility of pinned twin boundaries during mechanical loading of extruded binary Mg-1Zn alloy
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DOI：
10.1016/j.matchar.2018.02.034
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发表时间：
2018-05-01
影响因子：
4.7
通讯作者：
Bohlen, Jan
中科院分区：
文献类型：
--
作者：
Drozdenko, Daria;Dobron, Patrik;Bohlen, Jan
等温时效（即溶质偏析和析出）对双相Mg-1wt机械加载过程中{10 - 12}孪晶界迁移率的影响。研究了%Zn合金。沿孪晶边界的偏析导致钉住效应，因此，基于孪晶边界迁移的孪晶生长和收缩受到限制。利用扫描电子显微镜对其微观结构变化，特别是孪晶活动的发展进行了跟踪。在反向加载期间，孪生体积分数的减少（去孪生）是通过(i)在已经存在的孪晶片内形成新的孪晶形核或（ii）固定孪晶边界的迁移来实现的，类似于不进行热处理的情况。在脱晶过程中，没有观察到晶粒的取向对加载方向的影响。
The influence of isothermal aging, i.e. solute segregation and precipitation, on the mobility of {10 - 12} twin boundaries during mechanical loading of a binary Mg-1wt.%Zn alloy was investigated. Segregation along twin boundaries leads to a pinning effect and therefore, twin growth and shrinkage based on twin boundary migration are restricted. The development of microstructure changes, especially the twinning activity, is tracked by using scanning electron microscopy. During reverse loading, a reduction of the twinned volume fraction (detwinning) is realized either by (i) nucleation of new twins inside already existing twin lamellae or by (ii) migration of pinned twin boundaries, similarly to the case, when no heat treatment is applied. No effect of the orientation of the grain with respect to the loading direction during detwinning was observed.