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在－１９６℃下对钛进行了拉伸和低周循环变形，观察分析了变形后试样的微观组织结果表 明，工业纯钛在－１９６℃拉伸变形后，强度比在室温下拉伸变形有了明显的提高，塑性也有明显的增加； 在－１９６℃下循环变形时，循环应力－应变曲线位于－１９６℃静拉伸应力一应变曲线的上方，显示出明显 的循环硬化特征微观组织观察表明，一１９６℃拉伸及循环变形试样中存在着大量的李晶，且孪晶数量随 着循环应变幅及循环周次的增加而增加．在工业纯钛－１９６℃下的拉伸及循环变形中孪生起重要作用．
Tensile and low-cycle deformation of titanium were carried out at -196 ℃. The microstructure of the samples after deformation was observed and analyzed. The results show that the tensile strength of the pure titanium after tensile deformation at -196 ℃ is lower than that at room temperature With obvious improvement, the plasticity also increased obviously. Cyclic stress-strain curve at -196 ℃ is located above the static strain-strain curve of -196 ℃, showing obvious cyclic hardening characteristic microstructure observation It shows that there is a large amount of Li crystal in a sample of 196 ℃ stretching and cyclic deformation, and the number of twins increases with the increase of cyclic strain amplitude and cycle. Twinning plays an important role in the tensile and cyclic deformation of industrial pure titanium at -196 ℃.