近年来,新型钛基无镍合金以其良好的生物相容性、耐腐蚀性、低弹性模量、高相变温度等特性成为了形状记忆合金领域的研究重点.采用X射线衍射(XRD)、金相光学显微镜(OM)、透射电镜(TEM)、差示扫描量热分析(DSC)、压缩应力-应变实验等方法系统研究了TixZr100-x(x=20,30,50,70,80)合金的微观组织结构、相变特性、力学性能及形状记忆效应.结果表明:二元钛锆合金是一种典型的高温形状记忆合金,室温下为具有孪晶结构的单一hcp-α'马氏体相,晶格常数和晶胞体积都会随Zr原子含量增加而增大;合金具有从△母相到hcp-α'马氏体的可逆相变,相变温度随Zr原子含量增加先降低后增大,在Zr含量50％附近,马氏体相变开始温度最低,约为520 ℃;合金的屈服强度随Zr原子含量增加而增大,在Zr含量50％附近达到最大值(955 MPa),然后随Zr含量增加而下降;不同成分合金均具有形状记忆效应,其中Ti70 Zr30合金的记忆效应最大,为1.7％.
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