室温动态等径角挤压CP-Ti的变形孪晶研究  

An Investigation of Deformation Twinning in Commercially Pure Titanium during Dynamic Equal Channel Angular Pressing at Room Temperature

作　　者：冯永智 卢磊[1] 钟政烨 FENG Yongzhi;LU Lei;ZHONG Zhengye(Key Laboratory of Advanced Technologies of Materials,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学教育部先进材料与技术重点实验室,成都610031

出　　处：《有色金属工程》2020年第7期20-25,39,共7页Nonferrous Metals Engineering

基　　金：四川省科技计划资助项目(2019YFG0445)。

摘　　要：室温下运用动态等径角挤压(D-ECAP)技术实现了工业纯钛(CP-Ti)在L型模具内的高应变率剪切变形,结合电子背散射衍射(EBSD)技术研究了CP-Ti动态剧烈塑性变形过程中的孪生行为。结果表明,D-ECAP变形在CP-Ti中激发了大量的一次{1122}和{1012}孪晶,同时生成了少量的一次{1121}、{1011}、{1123}和{1124}孪晶。在单个晶粒内部,一次{1122}压缩孪晶和一次{1012}拉伸孪晶分别存在四种和两种孪晶变体,以一次{1122}压缩孪晶和一次{1012}拉伸孪晶为基体可进一步激发二次{1122}-{1121}、{1122}-{1012}和{1012}-{1122}孪晶以及三次{1122}-{1012}-{1122}和{1012}-{1122}-{1012}孪晶,其中二次{1122}-{1012}和{1012}-{1122}孪晶均存在两种孪晶变体。High strain rate shear deformation of commercially pure titanium(CP-Ti)in an L-shaped die was achieved with dynamic equal channel angular passing(D-ECAP)at room temperature.The deformation twinning behaviors of CP-Ti after D-ECAP was analyzed with electron backscatter diffraction.The results show that massive primary{1122}and{1012}twins are activated,simultaneously,while a small number of primary{1121},{1011},{1123}and{1124}twins are observed in the deformed CP-Ti.In a single grain,primary{1122}compression twin and{1012}extension twin can exist in the form of four and two kinds of twin variants,respectively.Secondary{1122}-{1121},{1122}-{1012}and{1012}-{1122}twins as well as tertiary{1122}-{1012}-{1122}and{1012}-{1122}-{1012}twins can be further activated in the primary{1122}compression and{1012}extension twins.Both secondary{1122}-{1012}and{1012}-{1122}twins exist in the form of two kinds of twin variants.

关 键 词：动态等径角挤压变形 工业纯钛 变形孪晶 

分 类 号：TG146.23[一般工业技术—材料科学与工程]