Effects of α/β volume fraction on the superplastic deformation behavior of Ti-6Al-4V alloy

J. S. Kim, Y. W. Chang, C. S. Lee

Research output: Contribution to conferencePaperpeer-review

2 Scopus citations

Abstract

Present investigation has been made to study the superplastic deformation behavior of Ti-6Al-4V alloy with respect to the variation of α/β volume fraction. The results have been analyzed by the theory of inelastic deformation which consists of two mechanisms, i.e., the grain matrix deformation and the phase/grain boundary sliding. Grain matrix deformation is found to be dominant at 600 °C and well described by the plastic state equation when a permeability parameter, p, is 0.15. Phase boundary sliding becomes dominant at 800 °C and also consistent with the viscous flow equation with Mg = 0.5. The flow stress curves for the fine grained structures (3 μm) are well agreed with the iso-stress model, while those for large grained materials are the mixed mode of iso-stress and iso-strain rate modes. The largest elongation obtained in the 48% β structure is primarily attributed to the phase boundary sliding occurring predominantly in the microstructure.

Original languageEnglish
Pages141-150
Number of pages10
StatePublished - 1997
EventProceedings of the 1997 TMS Annual Meeting - Orlando, FL, USA
Duration: 9 Feb 199713 Feb 1997

Conference

ConferenceProceedings of the 1997 TMS Annual Meeting
CityOrlando, FL, USA
Period9/02/9713/02/97

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