Effect of beta volume fraction on the dynamic grain growth during superplastic deformation of Ti3Al-based alloys
SCIE
SCOPUS
- Title
- Effect of beta volume fraction on the dynamic grain growth during superplastic deformation of Ti3Al-based alloys
- Authors
- Kim, JS; Nam, WJ; Lee, CS
- Date Issued
- 1998-01
- Publisher
- KOREAN INST METALS MATERIALS
- Abstract
- The superplastic deformation behavior of Ti3Al based (alpha(2)+beta) alloy was studied with respect to the volume fraction of alpha(2)/beta. Three alloys containing 21, 50 and 77% in volume fractions of beta exhibited large tensile elongations of over 500% at 970 degrees C with a strain rate of 2.5x10(-4) sec(-1). The largest elongation was observed in the alloy with 21% of beta. As the volume fraction of beta phase increased, the flow stress and correspondingly, the strain-rate sensitivity values decreased. Due to the higher diffusivity of Ti in beta phase than in alpha(2) phase, the increase in beta volume fraction from 21% to 77% accelerated the dynamic grain growth, and degraded the superplasticity of the Ti3Al-based alloys. The strain-based grain growth behavior was quantitatively analyzed and incorporated into a constitutive equation. The calculated flow curves are in agreement with the experimental ones in the stable deformation region.
- Keywords
- dynamic grain growth; superplasticity; Ti3Al; beta volume fraction; TI3AL
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/20621
- DOI
- 10.1007/BF03025974
- ISSN
- 1225-9438
- Article Type
- Article
- Citation
- METALS AND MATERIALS-KOREA, vol. 4, no. 5, page. 1041 - 1046, 1998-01
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- There are no files associated with this item.
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