Phase equilibria and composition dependence of martensitic transformation in Ni-Mn-Ga ternary system

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• 作者：Shuiyuan Yang ; Cuiping Wang ; Xingjun Liu ; ^{lxj@xmu.edu.cn}
• 关键词：A. Ternary alloy systems ; B. Phase diagrams ; B. Martensitic transformations ; D. Microstructure
• 刊名：Intermetallics
• 出版年：2012
• 期刊代码：36_09669795
• 类别：ms
• 出版时间：June, 2012
• 卷：25
• 期：Complete
• 页码：101-108
• 文件大小：2057 K

摘要

Phase equilibria of Ni-Mn-Ga ternary system at 800聽掳C, 900聽掳C and 1000聽掳C were experimentally investigated by the diffusion couples and equilibrated alloys. The results show that the bcc phase possesses a wide composition range at high temperature. And the liquid and bcc phases extend to the Ni-Mn side and the region of bcc phase becomes longer and narrower with increasing temperature. A new ternary intermetallic compound (Ni, Mn)₂Ga with the Mn₂Ge-type hexagonal structure is present at 800聽掳C, but it disappears at 900聽掳C and 1000聽掳C. Based on the obtained information of phase equilibria, the composition dependence of martensitic transformation on the composition region of Ni₂MnGa alloys was discussed. The present study may be useful for structural analysis and phase identification, as well as estimation of martensitic transformation temperatures of Ni-Mn-Ga alloys.