工业纯钛室温ECAP变形的组织和性能  

Microstructure and Properties of Commercial Pure Titanium Processed by ECAP at Room Temperature

作　　者：王成[1] 赵西成[1] 杨西荣[1] 王幸运[1] 

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055

出　　处：《材料科学与工程学报》2009年第3期476-479,共4页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(50874086);陕西省教育厅专项基金资助项目(07JK307);西安建筑科技大学重大科技项目创新基金项目(ZX0506)

摘　　要：采用BC方式等径弯曲通道变形(Equal Channel Angular Pressing,简称ECAP)对工业纯钛进行了8道次室温变形,研究了变形道次对显微组织和力学性能的影响。结果表明,铁素体组织随变形道次的增加逐渐演变为等轴状大角度晶界的超细晶组织;试验材料的硬度和强度随变形道次的增加而增加,伸长率曲线以第3道次为临界点,第3道次前材料伸长率曲线随挤压道次的增加而下降,而3道次后,曲线开始上升,材料伸长率增大。Commercial purity titanium was successfully processed by equal channel angular pressing （ECAP） of eight passes with Bc route at room temperature, and the influences of ECAP pass on microstructures and mechanical properties were examined. The results indicate that the initial uniphase ferrite microstructure gradually developed into equiaxed ultrafinegrained microstructure with high angle boundaries as the pass number increased. The hardness and strength of the test material increased with the increasing pass number. The extensibility curve took the third pass as its critical point. In the first three passes, the extensibility curve of the material went down as the pass number increased. But after the third pass, the curve began to rise, the extensibility of the material increased.

关 键 词：等径弯曲通道变形 工业纯钛 超细晶组织 细化机理 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]