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Atomic segregation at twin boundaries in a Mg-Ag alloy
Scripta Materialia ( IF 5.3 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.scriptamat.2019.11.025
X.F. Chen , L.R. Xiao , Z.G. Ding , W. Liu , Y.T. Zhu , X.L. Wu

Abstract Segregation of solute atoms at twin boundaries (TBs) plays a critical role in mechanical properties and thermal stability of magnesium alloys. Here, segregation structures at {10 1 ¯ 1}, {10 1 ¯ 2} and {10 1 ¯ 3} TBs are characterized in a Mg-Ag alloy by means of the atomic resolution high-angle annular dark-field technique based on scanning transmission electron microscopy. Of particular finding is the unique complex segregation at {10 1 ¯ 3} TBs, where Ag atoms occupy both substitutional and interstitial sites. By contrast, Ag atoms only substitutionally segregate at {10 1 ¯ 1} and {10 1 ¯ 2} TBs. Calculation simulation of segregation energy and three-dimensional structure of TBs helps understanding of hybrid segregation.

中文翻译:

Mg-Ag 合金中孪晶边界处的原子偏析

摘要 溶质原子在孪晶界(TBs)的偏析对镁合金的力学性能和热稳定性起着至关重要的作用。在这里,通过基于原子分辨率的高角度环形暗场技术,在 {10 1 ¯ 1}、{10 1 ¯ 2} 和​​ {10 1 ¯ 3} TBs 处的偏析结构在 Mg-Ag 合金中被表征扫描透射电子显微镜。特别的发现是 {10 1 ¯ 3} TBs 处独特的复杂偏析,其中 Ag 原子同时占据置换位点和间隙位点。相比之下,Ag 原子仅在 {10 1 ¯ 1} 和 {10 1 ¯ 2} TBs 处发生置换分离。TBs的偏析能和三维结构的计算模拟有助于理解混合偏析。
更新日期:2020-03-01
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