Deformation behavior of dual-phase LTSP Ti3Al based alloy

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)71-76
Journal / PublicationKey Engineering Materials
Volume340-341
Online published15 Jun 2007
Publication statusPublished - 2007
Externally publishedYes

Conference

TitleThe 8th Asia-Pacific Symposium on Engineering Plasticity and Its Applications (AEPA2006)
LocationNagoya University
PlaceJapan
CityNagoya
Period25 - 29 September 2006

Abstract

Ti3Al based alloys have been widely reported for their admirable superplasticity in the temperature range of 900-1000°C. However, the superplastic behavior of temperature lower than 900°C was seldom reported. Dual phase (α2+β) Ti3Al-10Nb alloy has shown superior superplastic elongation of 1500% at 960°C and 2×10-4 s -1. In this paper, it aims to investigate the superplastic behavior at lower temperature (700-900°C). The relationship of texture characteristics, phase transformation phenomena, and deformation mechanism at lower temperature (below 900°C) are studied. The optimum low-temperature superplastic condition with an elongation of 333% was occurred at 850°C and 5×10-4 s-1. With abundant hexagonal α2' laths formed inside the β grains, the major accommodation process via dislocation slip across the β grains is impeded. It leads to premature failure and lower tensile elongations at lower temperature. Moreover, with the minor operating of grain rotations and grain boundary sliding, the texture intensity decreases significantly at temperature 850°C.

Research Area(s)

  • phase transformation, superplastic deformation, texture