Influence of Al content on martensitic transformation behavior in Zr₅₀Cu_{50鈭?span style='font-style: italic'>x}Al_x

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• 作者：F.Q. Meng^a ; ^b ; ^{meng.fanqiang@nims.go.jp} ; K. Tsuchiya^a ; ^b ; F.X. Yin^a ; S. Ii^a ; Y. Yokoyama^c
• 关键词：Glasses ; Metallic ; Martensitic transformation ; Thermal stability ; Martensitic structure ; Calorimetry
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：5 May, 2012
• 卷：522
• 期：Complete
• 页码：136-140
• 文件大小：1728 K

摘要

Influence of Al content on martensitic transformation temperature in ZrCu phase was investigated by differential scanning calorimetry for a series of Zr₅₀Cu_50鈭?em>xAl_x alloys. The crystallographic structure of the martensite was predominantly a monoclinic Cm, which is a superstructure of B19鈥? Microstructural observations revealed that a higher Al content above 6 mol%led to a pronounced formation of Zr₂Cu and 蟿₅ phases forming complex eutectic microstructures. The electron probe microanalysis indicated that the Al atoms in ZrCu phase substitute the Cu atoms up to 6 mol%and the excess Al atoms exist mainly in the 蟿₅ phase. The increasing Al content from 0 to 6 mol%induced a decrease in the martensitic transformation start temperature, M_s, from 446 K to 311 K, and in the reverse martensitic transformation start temperature, A_s, from 537 K to 468 K. But M_s remained almost constant when the Al content is over 6 mol%. Thus, the substitution of the Cu atoms by the Al atoms in ZrCu phase led to the decrease in M_s and A_s.