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Low-Temperature Superplasticity of Ultra-fine-grained Ti-6Al-4V Processed by Equal-Channel Angular Pressing

Title
Low-Temperature Superplasticity of Ultra-fine-grained Ti-6Al-4V Processed by Equal-Channel Angular Pressing
Author
신동혁
Keywords
Material Transaction; Total Elongation; ECAP Pass; Superplastic Defor
Issue Date
2006-02
Publisher
MINERALS METALS MATERIALS SOC
Citation
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, v. 37A, No. 2, Page. 381-391
Abstract
The low-temperature superplasticity of ultra-fine-grained (UFG) Ti-6Al-4V was established as a function of temperature and strain rate. The equiaxed-alpha grain size of the starting material was reduced from 11 to 0.3 mu m (without a change in volume fraction) by imposing an effective strain of similar to 4 via isothermal, equal-channel angular pressing (ECAP) at 873 K. The ultrafine microstructure so produced was relatively stable during annealing at temperatures up to 873 K. Uniaxial tension and load-relaxation tests were conducted for both the starting (coarse-grained (CG)) and UFG materials at temperatures of 873 to 973 K and strain rates of 5 X 10(-5) to 10(-2) s(-1). The tension tests revealed that the UFG structure exhibited considerably higher elongations compared to those of the CG specimens at the same temperature and strain rate. A total elongation of 474 pct was obtained for the UFG alloy at 973 K and 10(-4) s(-1). This fact strongly indicated that low-temperature superplasticity could be achieved using an UFG structure through an enhancement of grain-boundary sliding in addition to strain hardening. The deformation mechanisms underlying the low-temperature superplasticity of UFG Ti-6Al-4V were also elucidated by the load-relaxation tests and accompanying interpretation based on inelastic deformation theory.
URI
https://link.springer.com/article/10.1007/s11661-006-0008-zhttps://repository.hanyang.ac.kr/handle/20.500.11754/107644
ISSN
1073-5623; 1543-1940
DOI
10.1007/s11661-006-0008-z
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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