论文部分内容阅读
美国马里兰大学材料和核工程系教授S.Ankem著文论述了近年来有关钛合金变形特性的研究及其研究结果在钛合金选择和设计方面的重要性.对αTi-0.4Mn合金室温下拉伸和蠕变变形特性的研究表明,蠕变随晶粒尺寸的增大而增加.在粗晶(500μm)材料中观察到了随时间变化的孪生,认为粗晶材料较高的蠕变应变是由这种与时间相关的孪生引起的.能使孪生减少的任何合金元素对α钛都有利.高温下(923～1023K)的研究表明,流变应力随应变速率增加和温度降低而增加,其拉仲变形激活能接近于α钛的自扩散激活能.由此认为,其变形机制主要是攀
S.Ankem, a professor of materials and nuclear engineering at the University of Maryland, describes the research on the deformation behavior of titanium alloys in recent years and the importance of the results in the selection and design of titanium alloys. The tensile properties of αTi-0.4Mn alloy at room temperature And creep deformation characteristics show that the creep increases with the grain size increases.While twins that change with time are observed in coarse-grained (500μm) materials, the higher creep strain of the coarse-grained material is determined by Time dependent twinning of any alloying element that can reduce twinning is beneficial for alpha titanium. Studies at elevated temperatures (923-1023K) have shown that flow stress increases with increasing strain rate and decreasing temperature, The deformation activation energy is close to the self-diffusion activation energy of α-titanium, so the deformation mechanism is mainly that of climbing