Ti_(50-0.5x)Ni_(50-0.5x)Cu_x合金的微观组织

MICROSTRUCTURES OF Ti_(50-0.5x)Ni(50-0.5x)Cu_x ALLOYS

通过对Ti50-0．5xNi50-0．5xCux(x=2,5,10,15)合金微观组织的观察和分析,得出了Cu含量对合金组织的影响规律．当x=2时,合金组织主要是NiTi(B2)相,没有CuNiTi相形成;当x=5时,合金组织中开始出现少量的CuNiTi相;当x≥10时,合金组织中有呈网状分布的大尺寸的CuNiTi相．热处理会影响合金的微观组织．当x≥5时,经适当热处理后合金的NiTi相上有大量弥散分布的CuNiTi相析出．CuNiTi相析出促使合金的相变温度向低温方向移动．

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.