An electron-microscopical investigation on the martensitic transformation in TiNi
An electron-microscopical investigation on the martensitic transformation in TiNi
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DOI：
10.1007/bf00554765
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发表时间：
1974
影响因子：
4.5
通讯作者：
S. Zijlstra;J. Beijer;J. A. Klostermann
中科院分区：
文献类型：
--
作者：
S. Zijlstra;J. Beijer;J. A. Klostermann
等原子TiNi马氏体的形态的电子显微镜研究揭示了至少两种类型的马氏体：孪晶板状马氏体和波状马氏体。据我们所知，后者从未在文献中报道过。在薄箔中，室温下或在+100° C ~液氮温度之间的温度循环下，片状马氏体可在几周内转变为波状马氏体。借助于显微镜上的录像系统，动态地研究了向波状马氏体的转变。这揭示了波状马氏体和高温相之间的不规则边界的逐步迁移。从B2相到波状马氏体的转变之前，形成具有CsCl（B2）结构的三倍晶格参数的超结构。在温度循环过程中，相变对冷却速率非常敏感，如果冷却速率太高，甚至可以完全抑制相变。相变特性不受样品热历史的影响。
An electron-microscopical investigation of the morphology of equiatomic TiNi martensite has revealed at least two types of martensite: the twinned plate martensite and a wavy martensite. To our knowledge the latter has never been reported in the literature before. In a thin foil, the plate martensite can be transformed into the wavy martensite within a few weeks at ambient temperature or by temperature cycling between +100° C and liquid nitrogen temperature.The transformation into the wavy martensite has been studied dynamically with the aid of a video-recording system attached to the microscope. This revealed the step-wise migration of the irregular boundary between the wavy martensite and the high temperature phase. The transformation from the B2 phase to the wavy martensite is preceded by the formation of a superstructure having three times the lattice parameter of the CsCl (B2) structure. The transformation is very sensitive to the cooling rate during temperature cycling and can even be totally suppressed if the cooling rate is too high. The transformation characteristics are not affected by the thermal history of the sample.