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Journal of Materials Science

, Volume 46, Issue 18, pp 6018–6028 | Cite as

Deformation behavior and microstructure evolution in multistage hot working of TA15 titanium alloy: on the role of recrystallization

  • X. G. FanEmail author
  • H. Yang
  • P. F. Gao
Article

Abstract

Interrupted compression tests of TA15 titanium alloy with initially equiaxed microstructure were carried out at deformation temperatures between 1173 to 1273 K and strain rates between 0.001 to 0.1 s−1 to investigate the deformation behavior and microstructure evolution under multistage deformation. The TA15 alloy exhibits significant flow softening in both β and (α + β) working. It is found that the flow softening relates to dynamic recrystallization of β phases under current experimental conditions. In multistage β working, metadynamic recrystallization is the main softening mechanism during inter-pass holding. The grain refinement by metadynamic recrystallization leads to the decrease in peak stress upon reloading. In multistage (α + β) working, static recrystallization is the main softening mechanism during inter-pass holding. The static recrystallization kinetics increases with temperature and strain rate. The inter-pass holding has little influence on the morphology of the primary α phases. The β grain size is determined by spacing of primary α phases, which is more affected by working temperature but less dependent on strain rate and inter-pass holding time.

Keywords

Multistage deformation TA15 titanium alloy Flow stress Microstructure Recrystallization 

Notes

Acknowledgements

The authors would like to gratefully acknowledge the support of Natural Science Foundation for Key Program of China (No. 50935007) and National Basic Research Program of China (No. 2010CB731701).

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.State Key Laboratory of Solidification Processing, School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’anPeople’s Republic of China

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