Microstructures of Ti50-0.5xNi50-0.5xCux Alloys
Jinshu Xuebao/Acta Metallurgica Sinica(2006)
Abstract
By observation and analysis of the microstructures of Ti50-0.5xNi50-0.5xCux alloys, the effect of the Cu content on microstructures was investigated. When x = 2, the alloy mainly consists of NiTi (B2) phase and there is no CuNiTi phase. When x = 5, there is a little of CuNiTi phase in the microstructure before heat treatment. When x ≥ 10, network-like CuNiTi phase with big size forms. Heat treatment influences the microstructure. When x ≥ 5, a lot of needle-like CuNiTi phase precipitates and distributes dispersedly in NiTi phase after proper heat treatment. The precipitation of CuNiTi phase lowers the transformation temperature.
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Key words
Heat treatment,Microstructure,Shape memory,Ti-Ni-Cu
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