Phase equilibrium and martensitic transformation in near equiatomic TiPd alloys
Phase equilibrium and martensitic transformation in near equiatomic TiPd alloys
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DOI：
10.1016/j.msea.2006.01.120
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发表时间：
2006-11
期刊：
影响因子：
6.4
通讯作者：
T. Yamamuro;Y. Morizono;J. Honjyo;M. Nishida
中科院分区：
文献类型：
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作者：
T. Yamamuro;Y. Morizono;J. Honjyo;M. Nishida
通过不同成分的固溶处理和时效试样的马氏体转变行为和扩散偶方法，通过实验确定了TiPd化合物的均匀范围，然后重新研究了Ti侧TiPd二元系的相图。 Pd 一侧的 TiPd 化合物的相界几乎恒定在约 50.5at.% Pd。另一方面，Ti 侧的 Ti 含量从 873K 左右时的 50.6at.% Ti 延伸到 1073K 时的约 51.8at.% Ti。从扩散偶实验中，我们认识到在 30at.% Pd 附近存在 A2(bcc) 到 B2 的有序无序转变，而不是 β-Ti 和 TiPd 双相区域。还证实Ti3Pd化合物是通过β-Ti和Ti2Pd之间的包晶反应形成的。根据这些结果，我们提出了 TiPd 二元系统的新相图。
The homogeneity range of the TiPd compound is experimentally determined from martensitic transformation behaviors of solution treated and aged specimens with various compositions and diffusion couple method, and then the phase diagram of TiPd binary system in Ti side is reinvestigated. The phase boundary of TiPd compound on the Pd side is almost constant at about 50.5at.% Pd. On the other hand, that on the Ti side extends from 50.6at.% Ti at around 873K to about 51.8at.% Ti at 1073K. From the diffusion couple experiments, it is recognized that there is an A2(bcc) to B2 order–disorder transformation around 30at.% Pd instead of a β-Ti and TiPd duplex phase region. It is also confirmed that the Ti3Pd compound is formed by a peritectoid reaction between β-Ti and Ti2Pd. From these results, we propose a new phase diagram of the TiPd binary system.