Measurement of Plastic Zone at Fatigue Crack Tip by Microhardness and Nanoindentation Technique
Plastic zone at fatigue crack tip played an important role in crack propagation. In this study, the specimens were taken from titanium alloy after fatigue test. Mechanical polishing and chemical polishing both were adopted in order to remove the deformation layer and gain smooth surface. On the basis of the characteristic of the fracture surface,specimen thickness and the stress state, the plastic zone was calculated in theory. Then the microhardness test and the nanoindentation test were carried out to assess mechanical properties at small scales that indirectly showed the characteristic of plastic zone. A large array of mirohardness and nanoindentation imprints were taken on the surface of material near the crack tip. The exact positions of the indentations were checked with Scanning Electron Microscope and the distance between each indentation and the crack was measured. The numerical value of hardness were various at plastic zone and elastic zone. Boundary of plastic zone corresponded with obvious changing of hardness. Basing on the hardness changing,the size of plastic zone near crack tip was obtained in the rough
Titanium (Ti) alloy plastic zone crack tip microhardness nanoindentation
Liu Cuiyun Yang Han Wen Shizhen Ma Chaoli Li Huanxi
Key Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education, School of Materials Science and Engineering ,Beihang University, Beijing 100191 ,China
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
1124-1127
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）