| Abstract |
| High-temperature deformation behavior of extra-low interstitial Ti-6Al-4V alloy with initially equiaxed microstructure (d = 5 μm) was investigated with the variations of temperature and strain rate in this study. Thin striped beta-phase of the starting material was uniformly distributed throughout the microstructure by imposing beta-annealing followed by hot cross-rolling processes (ε = 1). A series of uni-axial tension tests was carried out at temperatures of 800℃ to 950℃ and strain rates of 10(-4) s(-1) to 10(-2) S(-1). The tension tests evidenced that the present samples showed significantly higher elongation as compared to conventional ELI grade Ti-6Al-4V alloy at the same temperature and strain rate. It was mainly attributed to increased alpha/beta interface area resulting from the breakdown of beta-phase. A total elongation-to-failure of 1898% was obtained at temperature of 850℃ and strain rate of 10(-3) S(-1). In addition, a predominant deformation mechanism operating at high-temperature was suggested by using both microstructure and activation energy. |
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| Key Words |
| ELI grade Ti-6Al-4V, Beta-phase, Superplasticity, Strain rate sensitivity, Activation energy |
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