Phenomenological Consideration on the Change from the Non-thermoelastic to the Thermoelastic Type of Martensitic Transformations in Fe 3 Pt Alloy
Phenomenological Consideration on the Change from the Non-thermoelastic to the Thermoelastic Type of Martensitic Transformations in Fe 3 Pt Alloy
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Fe 3 Pt 合金马氏体相变从非热弹性型向热弹性型转变的唯象思考
DOI：
10.2320/matertrans1960.18.864
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发表时间：
1977
影响因子：
1.2
通讯作者：
T. Tadaki
中科院分区：
文献类型：
--
作者：
T. Tadaki
本文利用Wechsler、Lieberman和Read的理论和最近积累的晶体学数据，对Fe-Pt合金在Fe-Pt组份附近的非热弹性和热弹性马氏体相变进行了晶体学唯象计算。计算的（112）相变孪晶的惯习面法线、形状应变方向和相对孪晶宽度并不因马氏体相变类型而有很大差异。总形状应变和晶格不变剪切的大小较小的热弹性型转变。特别是，总形状应变的惯习面的法向分量是小得多的热弹性类型的转变，大约由一个数量级。奥氏体和马氏体晶格之间的取向关系接近西山的转变成为热弹性。由此得出结论，两种类型的马氏体相变之间的显着差异存在于总形状应变的法向分量的大小。通过比较热弹性Fe-Pt马氏体与非热弹性Fe-Al-C马氏体的晶体学与前者的非常相似，这一结论也是合理的。
Phenomenological calculations have been carried out on the crystallographies of nonthermoelastic and thermoelastic martensitic transformations in Fe-Pt alloys near the composition Fe-Pt, using the theory developed by Wechsler, Lieberman and Read and the crystallographic data recently accumulated. The calculated habit plane normals, directions of the shape strain, and relative twin widths of (112) transformation twins are not greatly different by the type of martensitic transformations. The magnitudes of total shape strain and lattice invariant shear are smaller for the thermoelastic type transformation. Particularly, the normal component of the total shape strain to the habit plane is much smaller for the thermoelastic type transformation roughly by one order of magnitude. The orientation relationship between the austenite and martensite lattices approaches the Nishiyama's as the transformation becomes thermoelastic. It is thus concluded that the distinct difference between the two types of martensitic transformations exists in the magnitude of the normal component of the total shape strain. This conclusion is also rationalized by a comparison of the thermoelastic Fe-Pt martensite with a non-thermoelastic Fe-Al-C martensite whose crystallographies are very similar to those of the former martensite.