초미세 결정립 순-Ti의 미세조직 및 상온 인장 물성
- Title
- 초미세 결정립 순-Ti의 미세조직 및 상온 인장 물성
- Other Titles
- Mechanical Behavior ; Microstructure and Tensile Properties of Ultra-Fine Grained Pure-Ti
- Author
- 신동혁
- Keywords
- Pure-Ti; Ultra-fine grain; Dislocation bow-out; Strain hardening; Dynamic recovery
- Issue Date
- 2005-08
- Publisher
- 대한금속재료학회
- Citation
- 대한금속·재료학회지, v. 43, No. 8, Page. 524-532
- Abstract
- A study was made to investigate microstructural evolution and mechanical properties of ultra-fine grained (UFG) pure-Ti produced by equal channel angular (ECA) pressings. The deformed structures were analyzed by finite element method and transmission electron microscopy with the increment of straining. After 4 isothermal ECA pressings, initial coarse grains (30 μm) were significantly refined to ~0.3 μm with homogeneous distribution of microstructure which was resulted from 180˚ rotation of the sample between pressings. UFG pure-Ti exhibited the considerable improvement in yield strength while losing strain hardening capacity as compared to coarse grained microstructure at ambient temperature, which was mainly attributed to ultra-fine grain microstructure with non-equilibrium grain boundaries. Such high strength and unusual strain hardening behavior of UFG pure-Ti were discussed in relation with two dislocation models based on dislocation bow-out and dynamic recovery associated with trapped lattice dislocations.
- URI
- http://kiss.kstudy.com/thesis/thesis-view.asp?key=2464518https://repository.hanyang.ac.kr/handle/20.500.11754/111312
- ISSN
- 1738-8228; 2288-8241
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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