中文摘要：

结合拉伸实验数据和断口形貌分析发现,中低温下工业纯钛的拉伸应力-应变曲线随着温度的升高和应变速率的降低不断降低,拉伸行为存在温度软化与应变速率强化现象,并且拉伸行为的温度敏感性强于应变速率敏感性。基于工业纯钛强度参量随着温度和应变速率的变化规律得到了定量的工业纯钛强度参量与温度和应变速率的关系式。为了定量地描述工业纯钛中低温拉伸应力-应变曲线的温度与应变速率敏感性,对Arrhenius方程、Johnson Cook（JC）方程和Modified Zerilli-Armstrong（MZA）方程在工业纯钛中低温拉伸行为的应用进行比较发现,Arrhenius方程的预测精度最高,MZA方程次之,而JC方程的预测精度最低。

英文摘要：

Based on the tensile experimental data and fracture morphology analysis,it was found that with temperature increasing and strain rate decreasing,the stress-strain curve declined. The tensile behavior of CP-Ti was temperature softening and strain rate hardening,and temperature sensitivity of tensile behavior was higher than strain rate sensitivity. Based on the variation of strength parameters of CP-Ti with temperature and strain rate,the correlation equations of strength parameters,temperature and strain rate were obtained. In order to select a reasonable constitutive equation to describe the temperature and strain rate sensitivities of stress strain curve of CP-Ti,the applications of Arrhenius equation,Johnson Cook（ JC）equation and Modified Zerilli-Armstrong（ MZA） equation on the tensile behavior of CP-Ti at low and intermediate temperatures were compared. It was found that,the Arrhenius equation had the highest prediction accuracy;MZA equation had the second highest prediction;JC equation had the lowest prediction accuracy.