商业纯钛拉压塑性变形行为与机理  

Plastic Deformation Behavior and Mechanisms of Commercial Pure Titanium under Tension and Compression

作　　者：陶智君[1] 李恒[1] 马俊[1] 杨恒[1] 杨合[1] 张晓丽 Tao Zhijun Li Heng Ma Jun Yang Heng Yang He Zhang Xiaoli(State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi＇an 710072, China)

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《稀有金属材料与工程》2017年第9期2470-2475,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金面上项目(51275415);国家自然科学基金优秀青年科学基金(51522509)

摘　　要：通过拉伸和压缩试验,获得了商业纯钛在不同温度和不同应变速率下的拉伸和压缩应力-应变关系,对比分析了拉压变形路径、变形温度和应变速率对商业纯钛塑性变形行为的影响;建立了Zener-Hollomon模型,获得了变形温度和应变速率对商业纯钛压缩变形加工硬化的作用规律及商业纯钛压缩变形加工图;基于电子背散射衍射技术,获得了商业纯钛晶粒取向分布,结合拉压变形特性阐明了商业纯钛拉伸塑性变形机理主要是滑移,压缩塑性变形机理主要分为滑移-孪生-滑移3个阶段。By tensile and compressive tests of commercial pure titanium（CP-Ti）,the relationships between tension and compressive stress-strain at various deformation temperatures and strain rates were obtained. Then,the influences of deformation temperatures,tension/compression loading paths and strain rates on the stress-strain relationships were investigated. With Zener-Hollomon model,the influencing rules of the temperatures and strain rates on work hardening were achieved and the compressive deformation processing map was constructed. Based on the EBSD analysis,the grain orientations of CP-Ti were obtained and the plastic deformation mechanisms for tension and compression were clarified： the slipping dominates the tension plastic deformation and the mechanism of compression plastic deformation is mainly slipping-twinning-slipping.

关 键 词：商业纯钛 拉压塑性变形 温度 变形机理 

分 类 号：TG146.23[一般工业技术—材料科学与工程]