Mechanical and Microstructural Analysis on the Superplastic Deformation Behavior of Two-Phase Ti-6Al-4V Alloy

Ji Sik Kim, Young Won Chang, Chong Soo Lee

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12 Scopus citations

Abstract

Present investigation has been made to study the superplastic deformation behavior of Ti-6Al-4V alloy based on the theory of inelastic deformation, and to analyze the boundary sliding characteristics by the use of transmission electron microscopy. The flow curves obtained by load relaxation tests at 600 °C and 800 °C are fitted well with the inelastic deformation theory. It has been found that the deformation mode for the fine grained microstructures (3 μm) is a type of iso-stress mode, while that of coarse grained microstructures (11 μm) is a mixed type of both iso-stress and iso-strain rate modes. The density of dislocations observed near the grain boundaries is higher along α/β phase boundaries than the α/β grain boundaries, which confirms that the sliding resistance of α/β is lower than that of α/β.

Original languageEnglish
Pages (from-to)771-777
Number of pages7
JournalMetals and Materials International
Volume4
Issue number4
DOIs
StatePublished - 1998

Keywords

  • Boundary sliding mode
  • Deformation mode
  • Super plasticity
  • Ti-6Al-4V alloy

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