Development of Constitutive Relationship for the Hot Deformation of Ti-47Al-2Cr-2Nb-0.2W Alloy

Abstract:

The high temperature deformation behaviors of Ti-47Al-2Cr-2Nb-0.2W alloy were investigated by isothermal compressive tests, performed at temperatures between 1000 and 1150 , strain rates between 0.001s-1 and 1s-1. The stress-strain curves of IM alloy exhibited an obvious work hardening peak followed by a broad flow softening at high strain rates(≥0.1s-1) while work hardening could hardly be seen from the stress-strain curves at low strain rates(≤0.01s-1). Also, the constitutive equation of the alloy had been established to describe the flow behavior. The apparent activation energy of hot deformation was calculated to be 351.61kJ/mol. The size of the recrystallized grain increased with increasing temperature and with decreasing strain rate, namely with decreasing the Zener-Hollomon parameter Z. It is necessary to select proper Z, that is, to strictly control the deformation parameters in order to obtain a homogeneous and fine microstructure.

• Periodical: Advanced Materials Research (Volumes 156-157)
• Pages: 625-632
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.156-157.625
• Online since: October 2010
• Authors: Hui Wang, Yong Liu, Wei Zhang, Li Wang, Bin Liu
• Keywords: Constitutive Relationship, Dynamic Recrystallization (DRX), High Temperature Deformation, Titanium Aluminide

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