纳米晶材料
材料科学
原子探针
合金
晶界
原子单位
透射电子显微镜
位错
再分配(选举)
材料的强化机理
Atom(片上系统)
纳米晶
扫描透射电子显微镜
变形机理
铝
化学物理
冶金
凝聚态物理
复合材料
纳米技术
微观结构
嵌入式系统
量子力学
计算机科学
物理
法学
政治
政治学
作者
Yulin Chen,Manping Liu,Lipeng Ding,Zhihong Jia,Shuangfeng Jia,Jianbo Wang,M. Yu. Murashkin,Р. З. Валиев,Hans Jørgen Roven
标识
DOI:10.1016/j.matchar.2023.112706
摘要
Exploring the redistribution mechanism of Mg from the perspective of experimental observation has been a long-term yet challenging attempt in Al-Mg alloys. Here we demonstrate a simple but effective approach to obtain non-uniform Mg solute distribution (i.e., Mg-enriched/depletion zones) around typical grain boundaries (GBs) in a nanocrystalline Al-8 Mg alloy. This abnormal segregation was detected by both high-angle annular dark-field scanning transmission electron microscopy and atom probe tomography. The results show that local strain and GB migration during deformation leads to spatially inhomogeneous Mg solute distribution around the GBs. Both the non-uniform distribution and the broadened GBs can hinder GB migration and dislocation motion, thus enhance the strength. An inhomogeneous solute distribution mechanism of Mg atoms is proposed based on the extensive investigations. This study may help with developing new strengthening mechanisms of nanocrystalline materials.
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