Equilibrium and metastable phases in a designed precipitation hardenable Mg-3Gd-3Nd-0.6Zr alloy

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• 作者：Qiaowang Chen^a ; ^b ; Aitao Tang^a ; ^{tat@cqu.edu.cn} ; Junhua Ye^a ; Longlong Hao^a ; Yurong Wang^a ; Tiejun Zhang^b
• 关键词：Magnesium alloys ; Age hardening ; Precipitation ; EBSD ; High&ndash ; angle annular dark&ndash ; field scanning transmission electron microscopy (HAADF&ndash ; STEM)
• 刊名：Materials Science and Engineering: A
• 出版年：2017
• 出版时间：16 February 2017
• 年：2017
• 卷：686
• 期：Complete
• 页码：26-33
• 全文大小：2719 K
• 卷排序：686

文摘

A precipitation hardenable Mg–3Gd–3Nd–0.6Zr alloy was designed by thermodynamic calculations firstly and then investigated by experiment. In the as–cast alloy, the solution of Nd atoms into equilibrium Mg5Gd phase facilitated its formation and increased its lattice constant. After a two–step solution and a two–step aging treatment, the alloy showed remarkable age–hardening response, which was caused by the formation of massive fine β1 precipitates. It is quite possible that the β1 phase is a continuous solid solution with metastable Mg3Nd and Mg3Gd phases.