Differences between the R-phase and the commensurate phase in iron-doped Ti-Ni shape memory alloys
Differences between the R-phase and the commensurate phase in iron-doped Ti-Ni shape memory alloys
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DOI：
10.1080/14786430802353409
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发表时间：
2008-01-01
影响因子：
1.6
通讯作者：
Mori, Hirotaro
中科院分区：
文献类型：
--
作者：
Choi, Mi-Seon;Yamamoto, Takuya;Mori, Hirotaro
Ti-44Ni-6Fe(At.%)合金最近被报道表现出类二级非公度-公度相变。现已研究了Ti-Ni合金中的(C)相和R相是否为同一相。研究了一系列Ti-(50-x)Ni-(X)Fe(At)合金的相变行为。%)合金，其中x=2.0、4.0、5.0、5.5、5.7、6.0。当x=5.7时，相变温度、相变熵变和相变应变随x的增加而不断减小，产物相明显为R相。然而，在x=5.7和x=6.0之间，这些值有明显的不连续性。此外，电子衍射实验还表明，C相的卫星反射强度明显弱于R相。这些结果强烈地表明C相与R相是不同的。
A Ti-44Ni-6Fe (at. %) alloy was recently reported to exhibit a second order-like incommensurate-commensurate transformation. Whether or not the commensurate (C) phase and the R-phase in Ti-Ni alloys are the same phase has now been investigated. Transformation behaviour was examined in a series of Ti-(50-x)Ni-(x)Fe (at. %) alloys with x = 2.0, 4.0, 5.0, 5.5, 5.7, 6.0. Transformation temperature, entropy change and the transformation strain decrease continuously as x increases up to x = 5.7, where the product phase is apparently the R-phase. However, there is an obvious discontinuity in these values between x = 5.7 and x = 6.0. In addition, electron diffraction experiments have revealed that the intensity of satellite reflections of the C-phase is obviously weaker than that of the R-phase. These results strongly suggest that the C-phase is different from the R-phase.