通过对片层取向与单轴应力方向呈不同角度的Ti-45Al-8Nb(原子分数,%)合金多孪晶合成(PST)晶体进行压缩实验,获得了室温压缩性能,分析了断口形貌及断裂失效的原因,并对Nb的强化作用进行了分析.PST晶体片层取向平行或垂直于应力方向时,剪切变形沿垂直于片层界面的方向前进;而当片层取向与生长方向夹角为45°时,剪切变形沿平行于片层界面的方向前进.0°取向PST晶体屈服强度最高,可达1296 MPa; 45°取向PST晶体塑性最好,压缩塑性应变约为1.1%,但屈服强度最低仅为847 MPa.Nb可以细化片层组织,提高位错运动的分切应力并降低层错能,使室温屈服强度显著提高.
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