基于纳米压入法Ti-13Mo-8Cr-6Sn-5Nb钛合金的应变率敏感性研究  

Investigation on strain rate sensitivity of Ti-13Mo-8Cr-6Sn-5Nb alloys by nanoindentation

作　　者：邢学刚 肖革胜[1] 王鹤峰 树学峰[1] XING Xuegang;XIAO Gesheng;WANG Hefeng;SHU Xuefeng(Institute of Applied Mechanics and Biomedical Engineering, Taiyuan University of Technology,Taiyuan 030024,China;College of Mechanics,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学应用力学与生物医学工程研究所,太原030024 [2]太原理工大学力学学院,太原030024

出　　处：《功能材料》2018年第9期9137-9140,9147,共5页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(11772217)

摘　　要：采用纳米压入法对钛合金室温应变率敏感性进行研究。通过控制加载阶段不同应变率达到最大压入深度,基于连续刚度测量原理,研究硬度及弹性模量的应变率敏感性,并观察压入应变率对于保载阶段材料蠕变位移的影响。结果表明,钛合金硬度表现出应变率敏感性,弹性模量对应变率不敏感。压痕保载阶段主要为位错运动主导的蠕变形式,蠕变应力指数随加载应变率增大而降低。Nanoindentation tests were conducted on titanium alloys to investigate the strain rate sensitivity at room temperature.The indenter was loaded to a fixed maximum load with different loading strain rate.The strain rate sensitivity of hardness and modulus was investigated based on continuous stiffness measurement,and the influence of strain rate on creep displacement was further studied.Results show that the titanium alloys exhibit great dependence on loading strain rate in terms of hardness while no obvious relationship can be observed between modulus and strain rate.In addition,dislocation motion is the main creep mechanism at holding stage,and creep stress exponent decreases with the increase of loading strain rate.

关 键 词：Β型钛合金 纳米压入 蠕变 应变率 应力指数 

分 类 号：O344.3[理学—固体力学]