对TC4钛合金的塑性以及微观组织进行了分析,研究了宏观组织与微观组织的变化。对TC4钛合金板材在中低温区(550~700℃)、不同拉伸速度下进行了单向拉伸试验。通过对材料伸长率及真应力-真应变曲线的分析,探索了材料从普通塑性变形到超塑性变形的变形机理。结果表明,变形温度和拉伸速度对材料真应力影响明显,变形温度越高,拉伸速度越小,材料真应力越小,塑性越好,在该状态下有更好的塑性加工性能。 The plasticity and microstructure of TC4 titanium alloy were analyzed and the changes of macrostructures and microstructures were studied. TC4 titanium alloy sheet in the low temperature zone (550 ~ 700 ℃), different tensile speed under the unilateral tensile test. Through the analysis of material elongation and true stress - true strain curve, the deformation mechanism of material from ordinary plastic deformation to superplastic deformation was explored. The results show that the deformation temperature and the tensile velocity have obvious effects on the true stress of the material. The higher the deformation temperature is, the smaller the tensile velocity is. The smaller the true stress of the material is, the better the plasticity is and the better plasticity is.