摘要
对纯钛圆柱样品进行准静态压缩试验,研究纯钛在准静态条件下的微观结构和织构演变及其变形机制。结果发现:准静态压缩纯钛中均形成了{2110}、{1211}和{2211}3种类型形变孪晶,微观结构演变经历了形变孪晶细化晶粒、孪晶达到饱和和晶粒破碎细化阶段。织构演变也经历了初始双峰织构转变为圆环状分布、圆环状分布转变为基面织构和基面织构增强3个阶段。微观结构和织构演变分析表明,准静态压缩纯钛的变形机制是:低应变阶段(ε≤0.3)以形变孪生为主,孪生饱和后(ε>0.3)转变为以位错滑移为主,其孪生饱和临界应变为0.3。
The cylindrical pure Ti specimens were subjected to quasi-static compression （QSC）. The microstructure and texture evolution and its deformation mechanism of QSC pure Ti were investigated. The results show that there are three types of deformation twins （{10 1 2},{1121}and{1122}twinning） in all samples. The microstructure evolution can be divided into some stages, including deformation twin refining grains, twins reaching saturation and grain refining. The texture evolution also experiences the following stages：the initial bimodal texture transforms to ring-like distribution at lower strain levels, and then the ring-like distribution transforms to basal texture and gradually increases at higher strains. According to the analysis of microstructure and texture evolution, it is shown that deformation twinning is dominant at lower strain levels （ε≤0.3）, however, dislocation slip plays a major role when strain exceeds 0.3. The critical strain of deformation twinning reaching saturation in QSC pure Ti is 0.3.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2014年第9期2315-2321,共7页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(51071183
50890170
51271208)
关键词
纯钛
准静态压缩
微观结构
织构
pure titanium
quasi-static compression
microstructure
texture
