用选区电子衍射结合约化胞程序分析的方法，发现在缓冷的ＴｉＮｉ合金中存在以（１／２）〈００１〉和（１／８）〈２１０〉超点阵衍射斑点为特征的亚稳相──ｘ相，它属于单斜晶系，其点阵常数为：ａ＝０．６６９ｎｍ，ｂ＝０．６０３ｎｍ，ｃ＝０．９５１ｎｍ和β＝９５°。
Thin foil samples of TiNi shape memory alloy,furnace cooled, were studied by selected area electron diffraction (SAD). Metastable x-phase, characterized by (1/2) <001> and (1/8) <210> superlattice diffraction spots,was newly discovered. It is confirmed by the combination of SAD and reduced cell program analyses that x-phase belongs to monoclinic crystal system. Its lattice parameters were determined to be:a=0.669 nm, b= 0.603 nm, c= 0.951 nm and β=95°.Correspondent:ZHAO Hingzhong, lecturer, Faculty of Metallic Materials, Department of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074
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