【摘要】 用Ｘ射线衍射仪分析了Ｔｉ６４％Ｃｒ（摩尔分数）合金在经过不同的热处理后的相结构，使用ＴＥＭ分析了该合金的亚结构。结果表明：Ｌａｖｅｓ相ＴｉＣｒ２的Ｃ１４→Ｃ１５相变速度很慢，室温下得到的是Ｃ１４和Ｃ１５混合相结构。Ｃ１５ＴｉＣｒ２的亚结构由细微的孪晶组成，这些孪晶是在Ｃ１４→Ｃ１５相变过程中由于产生了切变而形成的。Ｌａｖｅｓ相ＴｉＣｒ２的Ｃ１４→Ｃ１５相变是切变型相变，通过热处理引进过饱和空位和残余应力可以加快ＴｉＣｒ２的Ｃ１４→Ｃ１５相变速度。更多还原

【Abstract】 After different heat treatments, the phase structures of the Ti 64%Cr(mole fraction) alloy were analyzed using X ray diffraction, and its substructure was observed by TEM. The results showed that C14→C15 transformation of the Laves phase TiCr 2 is so sluggish that mixed structures of C14 and C15 exist at ambient temperature. The substructure of C15 TiCr 2 consists of microtwins, which are caused by shearing deformation in C14→C15 transformation. C14→C15 transformation of Laves TiCr 2 belongs to shear type. Supersaturated vacancies or residual stress, produced by the heat treatment, can enhance C14→C15 transformation of TiCr 2.更多还原