TC4钛合金在中低温下(超)塑性及微观组织研究

Research on(Super) Plasticity and Microstructure of TC4 Alloy at Medium-low Temperature

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. The changes of macrostructure and mierostructure were studied. Uniaxial tensile tests of TC4 alloy sheet at medium-low temperature （550-700 ＊C） and different tensile speeds were done. Through analyzing elongation of the material and the true stress-true strain curves, mechanism of the material from ordinary plastic deformation to superplastic deformation was explored. The results show that the effect of deformation temperature and tensile speeds on the true stress of the material is obvious. The higher the deformation temperature is, or the smaller the tensile speed is, the smaller the stress of the material is, and the better the plasticity is. In this state, the material has a better plastic processing performance.