| TiAl裂纹形核和塑性变形关系的研究 |
| |
| 引用本文： | 许廷军,陆永浩,曾一民,乔利杰,王燕斌,褚武扬. TiAl裂纹形核和塑性变形关系的研究[J]. 金属学报, 2000, 36(6): 608-612 |
| |
| 作者姓名： | 许廷军 陆永浩 曾一民 乔利杰 王燕斌 褚武扬 |
| |
| 作者单位： | 北京科技大学材料物理与化学系,北京,100083 |
| |
| 基金项目： | 国家自然科学基金资助项目59895150,59725104 |
| |
| 摘 要： | 对层状结构ＴｉＡｌ在扫描电镜中原位拉伸，发现裂纹前端首先出现滑移带，只有当局部塑性变形发展和临界状态，位错塞积应力等于原子键合务时才会使微米尺寸卑贱 裂纹不连续形核，裂纹可沿滑移带形核，可沿其它是面形核，方扩展，新的不连续裂纺的阻力不为民增大
|
| 关 键 词： | TiAl 裂纹形核 塑性变形 |
| 文章编号： | 0412-1961(2000)06-0608-05 |
| 修稿时间： | 1999-09-11 |
STUDY OF RELATIONSHIP BETWEEN INITIATION OF MICROCRACKS AND PLASTIC DEFORMATION FOR TiAl ALLOY |
| |
| XU Tingjun,LU Yonghao,ZENG Yimin,QIAO Lijie,WANG Yanbin,CHU Wuyang. STUDY OF RELATIONSHIP BETWEEN INITIATION OF MICROCRACKS AND PLASTIC DEFORMATION FOR TiAl ALLOY[J]. Acta Metallurgica Sinica, 2000, 36(6): 608-612 |
| |
| Authors: | XU Tingjun LU Yonghao ZENG Yimin QIAO Lijie WANG Yanbin CHU Wuyang |
| |
| Abstract: | In situ extension of TiAl with fully lamellar structure in SEM indicated that slip bands appeared first at the loaded crack tip. When the localized plastic deformation deveopped to a critical exteot, microcracks initiated because the stress induced by pile-up dislocations reached to the cohesive strength. The microcracks could initiate along the slip bands since slip plane is one of cleavage planes or along the other cleavage planes. The resistance of microcrack initiation increased with crack growth. |
| |
| Keywords: | TiAl crack initiation plastic deformation |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
