TC4-DT钛合金疲劳裂纹扩展及裂纹尖端塑性区  

Fatigue Crack Propagation and Crack Tip Plasticity Zone of TC4-DT Titanium Alloy

作　　者：郭萍[1,2] 赵永庆[1,2] 洪权[2] 曾卫东[1] 

机构地区：[1]西北工业大学,陕西西安710072 [2]西北有色金属研究院,陕西西安710016

出　　处：《稀有金属材料与工程》2014年第6期1479-1482,共4页Rare Metal Materials and Engineering

基　　金：国家重点基础研究发展计划"973"项目(2007CB613807)

摘　　要：研究了TC4-DT钛合金不同组织的疲劳裂纹扩展行为,观察了疲劳裂纹在不同显微组织中的裂纹扩展路径,分析了不同显微组织的裂纹尖端塑性区变形情况,并与理论计算结果进行了对比。结果表明,疲劳裂纹在片层组织中扩展路径曲折,且片层组织的裂纹尖端塑性区较双态组织的大,理论计算的裂纹尖端塑性区的范围较实际测量的范围小得多。The fatigue crack propagation behavior of different microstructures in TC4-DT titanium alloy was studied, and the crack propagation path in different microstructures was observed. The crack tip plasticity zone of different microstructures was analyzed, and was compared with the theoretical calculation results. The results reveal that fatigue crack propagation path is zigzag and the crack tip plasticity region is bigger in lamellar microstructure compared with the bi-modal microstructure. The crack tip plasticity region of theoretical calculation is much smaller than the actually measured range.

关 键 词：损伤容限钛合金 显微组织 裂纹扩展 裂纹尖端塑性区 

分 类 号：O346.1[理学—固体力学]