High temperature deformation behavior of powder metallurgy TiAl based alloys

Xin Lu, Shu Chao Wang, Hong Min Zhu, Xuan Hui Qu

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The high temperature mechanical properties and deformation behavior of powder metallurgy Ti-47.5Al-2.5V-1.0Cr alloy were investigated in a temperature range of 600 to 1050°C and a strain rate range of 0.002 to 0.2 s-1. The results show that during the hot deformation the yield strength of the TiAl based alloy decreases, whereas the ductility tends to rise with increasing deformation temperature and decreasing strain rate. The interrelations of peak flow stress, strain rate and deformation temperature can be described by Arrhenius' equation modified by a hyperbolic sine function, which indicates that the hot compression deformation is controlled by thermal activation. Under the deformation condition of 800 to 1050°C/0.002 to 0.2 s-1, the strain sensitivity of the alloy is 0.152, whereas the deformation activation energy of high temperature deformation is 376 kJ · mol-1.

Original languageEnglish
Pages (from-to)1181-1185
Number of pages5
JournalBeijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing
Volume32
Issue number9
Publication statusPublished - 2010 Sep 1
Externally publishedYes

Keywords

  • Activation energy
  • Deformation
  • High temperature properties
  • Intermetallics
  • Powder metallurgy
  • TiAl based alloys

ASJC Scopus subject areas

  • Engineering(all)

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