Unit cell determination in CuZr martensite by electron microscopy and X-ray diffraction
Unit cell determination in CuZr martensite by electron microscopy and X-ray diffraction
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DOI：
10.1016/s1359-6462(97)00003-1
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发表时间：
1997-05
影响因子：
6
通讯作者：
D. Schryvers;G. Firstov;J. Seo;J. Humbeeck;Y. Koval’
中科院分区：
文献类型：
--
作者：
D. Schryvers;G. Firstov;J. Seo;J. Humbeeck;Y. Koval’
与其他几种二元合金化合物一样，化学计量的CuZr具有CsCl型bcc基结构的B2相。在本系统中，该相在715 ℃和935 ℃之间表现为线性化合物.快速冷却到低于140 ℃将该相转变成至少两种单斜结构，其已经显示出具有马氏体特性，这对于B2相合金并不罕见，包括形状记忆行为。单斜相的晶胞尺寸，一个约为另一个尺寸的两倍，以前建议的基础上，粉末X-射线衍射和有限的电子显微镜结果。目前的调查的目的是确认或纠正这些晶胞的广泛的选区电子衍射（SAED），高分辨率电子显微镜（HREM）和现有的X射线衍射数据的改进的拟合程序。还将讨论母相和产物相之间的晶体学关系。
As several other binary alloy compounds, stoichiometric CuZr has a B2 phase with a CsCl type bcc based structure. In the present system this phase appears as a line compound between 715 C and 935 C. Rapid cooling to below 140 C transforms this phase into at least two monoclinic structures which have been shown to have martensitic characteristics, not unusual for B2 phase alloys, including shape memory behavior. Unit cell dimensions for both monoclinic phases, one about twice the size of the other, were previously suggested on the basis of powder X-ray diffractometry and limited electron microscopy results. The aim of the current investigation was to confirm or correct these unit cells by extensive selected area electron diffraction (SAED), high resolution electron microscopy (HREM) and improved fitting procedures of the existing X-ray diffraction data. The crystallographic relation between parent and product phases will also be discussed.