Effect of twin boundary on crack propagation behavior in magnesium binary alloys; Experimental and calculation studies

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• 作者：Hidetoshi Somekawa^a ; ^{somekawa.hidetoshi@nims.go.jp} ; Tomohito Tsuru^b ; ^c ; ^{tsuru.tomohito@jaea.go.jp}
• 关键词：Magnesium alloy ; Twin boundary ; Solute atom ; First-principles ; Crack propagation
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：15 March 2017
• 年：2017
• 卷：130
• 期：Complete
• 页码：114-118
• 全文大小：1258 K
• 卷排序：130

文摘

The impact of alloying elements on crack propagation and atomistic phenomenon at {101¯2}-type twin boundaries in magnesium was investigated via both experiments and calculations. The alloying elements clearly affected the crack propagation behavior. Cracks were difficult to propagate along matrix-deformation twinning interfaces in alloys that had high fracture toughness. In such magnesium alloys, the solute atoms, e.g., silver, manganese and zinc atoms, create adhesive interactions between magnesium atoms. Closed-shell and covalent-like bonding of these types of solute atoms would influence strong adhesion, which impedes the nucleation of a new surface at the twin boundary.