Atomic segregation at twin boundaries in a Mg-Ag alloy. (15th March 2020)

• Record Type: Journal Article
• Authors: Chen, X.F.; Xiao, L.R.; Ding, Z.G.; Liu, W.; Zhu, Y.T.; Wu, X.L.
• Is Part Of: Scripta materialia. Number 178(2020)
• Page Start: 193
• Page End: 197
• Publication Date: 2020-03-15
• Subjects: Segregation -- Twin boundary -- Magnesium alloy -- HAADF-STEM; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.11.025
• Languages: English
• ISSNs: 1359-6462

Abstract

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.