纳米压痕法分析ECAP变形工业纯钛的力学性能  

Nanoindentation Study on Mechanical Properties of Commercially Pure Ti Processed by ECAP

作　　者：刘晓燕[1] 赵西成[1] 杨西荣[1] 贾江平 

机构地区：[1]西安建筑科技大学,陕西西安710055 [2]西安陕鼓动力股份有限公司,陕西西安710075

出　　处：《稀有金属材料与工程》2017年第3期669-674,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51474170);陕西省教育厅专项基金(14JK1390)

摘　　要：采用等径弯曲通道变形(Equal Channel Angular Pressing,ECAP)技术制备了不同晶粒尺寸的超细晶工业纯钛,通过纳米压痕测试技术对ECAP变形工业纯钛的力学性能进行研究,讨论了加载应变速率和晶粒尺寸对工业纯钛硬度测试结果的影响,进一步分析了ECAP变形工业纯钛的应变硬化能力和残余应力。结果表明:随着加载应变速率的增大和晶粒尺寸的减小,工业纯钛的硬度值增加。硬度-位移曲线表现出具有硬化效应的压痕尺寸效应(Indentation Size Effect,ISE)。纳米压痕形貌表明:ECAP变形工业纯钛的应变硬化能力降低,存在残余压应力。Ultrafine grained commercially pure Ti with different grain sizes was prepared by Equal Channel Angular Pressing（ECAP）. The mechanical properties of the commercially pure Ti were investigated by a nanoindentation technique. The effects of loading strain rate and grain size on the nanoindentation measurement of commercially pure Ti were discussed. Strain hardening capacity and residual stress of commercially pure Ti were analyzed. The results indicate that the hardness of commercially pure Ti increases with the loading strain rate increasing and the grain size decreasing. The hardness-dislocation curves exhibit the Indentation Size Effect（ISE） with the incorporated hardening effect. The indentation morphology shows that commercially pure Ti processed by ECAP has low strain hardening capacity and compressive residual stress compared to the coarse-grained sample.

关 键 词：等径弯曲通道变形 工业纯钛 纳米压痕法 连续刚度测量 力学性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]