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| Mechanical Behavious of Ti6Al4V Alloy during Low-temperature Superplastic Deformation |
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| 东北大学材冶学院 |
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Cite this article:
. Mechanical Behavious of Ti6Al4V Alloy during Low-temperature Superplastic Deformation. Chin J Mater Res, 2008, 22(3): 269-273.
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Abstract In this study, superplastic tensile tests were carried out for Ti-6wt%Al-4wt%V alloy at temperatures of 700℃～850℃with initial strain rates of 3×10-4～5×10-3s-1. The tensile results show that Ti6Al4V alloy exhibit good low temperature superplasticity. The elongation of 536% was obtained at 800℃ with an initial strain rate of 5×10-4s-1, and the elongation over 300% were obtained even at a temperature of 700℃ (with an initial strain rate of 5×10-4s-1). The strain rate sensitivity values m kept about 0.3 in the whole deformation temperature range, and the maximal m value was 0.55. At the temperature range of 800～850℃, the deformation activation energy was very close to self-diffusion activation energy of grain boundary, which shows the main deformation mechanism is grain boundary sliding controlled by grain boundary diffusion. Yet, at the temperature range of 700～750℃, the deformation activation energy was much higher than the self-diffusion activation energy of grain boundary. The reason may be dynamic recrystallization and active dislocations motion.
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Received: 17 August 2007
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