研究了Ti-29Nb-13Ta-4.6Zr(质量分数,%)医用钛合金中α"马氏体相的形成及其对杨氏模量和力学性能的影响.对于β单相区固溶处理(1023,1123和1223 K分别热处理1.8,3.6,14.4和28.8 ks)并在冰水中淬火样品,X射线衍射和内耗测量表明:α"马氏体相的体积含量随固溶温度和固溶时间变化.这主要归因于晶粒尺寸对β相的稳定性和马氏体起始转变温度(Ms)的影响:当晶粒小于临界尺寸(约40 μm)时,由于马氏体起始转变温度较低,导致相转变被抑制;当晶粒大于临界尺寸时,α"马氏体相的体积含量随晶粒尺寸的增加而迅速增加;随着晶粒进一步长大,α"马氏体相的体积含量反而减少.实验结果还表明:相对于β相,α"马氏体相具有高塑性、低强度、低硬度和相近的杨氏模量.
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