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One of the difficulties of applying shape memory alloys to real applications is dealing with how applied stress affects the transformation temperatures and phase sequence. This paper presents stress-temperature phase transformation diagrams of the type described by Todoroki, Tamura and Suzuki [1]. The data employed to construct these diagrams relates to a previous study of binary NiTi alloys that have varied alloy compositions, prior cold work and heat treatment temperatures [2]. The diagrams presented in this paper graphically display how phase sequence as well as transformation temperatures vary with processing and alloying parameters. In addition, it is shown that the stress-temperature diagrams change after repeated thermal transformations against applied stress. Increasing M, temperatures and decreasing A, temperatures result in narrower thermal hysteresis and loss of the intermediate R-phase.

Stress/temperature phase diagrams as a tool for shape memory alloy selection and processing