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研究了ＮｉＴｉ（Ｘ）合金中第二相与Ｒ 相变的关系问题．结果表明： 如果合金中第二相与基体存在共格关系，且在［１１１］Ｂ２方向存在优先拉应力场， ＮｉＴｉ（Ｘ）合金中的Ｒ相变即可发生，否则只能诱发马氏体相变
The relationship between the second phase and the R phase transformation in NiTi (X) alloy was investigated. The results show that R phase transformation can occur in NiTi (X) alloy if there is a coherent relationship between the second phase and the matrix in the alloy and the preferential tensile stress field in the [111] B2 direction. Otherwise, martensite Phase change