Iranian Journal of Manufacturing Engineering

Iranian Journal of Manufacturing Engineering

Investigation of the hot deformation behavior of Ti-48Al-2Cr-2Nb intermetallic with duplex initial microstructure

Document Type : Original Article

Authors
Hossein Rezaei 1
Maryam Morakabati 1
Amir Momeni 2
1 Faculty of Materials and Manufacturing Technologies, Malek Ashtar University of Technology, Tehran, Iran
2 Faculty of Metallurgy and Material Engineering, Hamedan University of Technology, Hamedan, Iran
10.22034/ijme.2025.487610.2024
Abstract
The purpose of the present study is to investigate the hot flow behavior of Ti-48Al-2Cr-2Nb intermetallic with duplex initial microstructure. Hot compression tests were conducted at temperatures of 1000, 1050, 1100, and 1150 °C and strain rates of 0.001, 0.01, and 0.1 s-1. The peak stress decreased with increasing deformation temperature and decreasing strain rate. The highest strain rate sensitivity coefficient for hot deformation was 0.33 at 1100°C and strain rate of 0.001 s-1, while the lowest value was below 0.13 in the strain rate range of 0.1 s-1 and temperatures from 1000 to 1100°C. The activation energy was calculated to be 166 kJ/mol, and the stress exponent was 3.4. During hot deformation of this intermetallic at temperatures of 1000 and 1050°C, lamellae bending along with dynamic recrystallization were the dominant softening mechanisms. Increasing the temperature and reducing the strain rate led to an increase in the recrystallization fraction and recrystallized grain size. As the deformation temperature increased to 1100°C, due to approaching the temperature range of the α2/α transformation, the possibility of recrystallization through nucleation decreased, and phase decomposition became the dominant softening mechanism. During deformation at 1150°C, the dominant softening mechanism changed to occur through the formation of shear bands. Based on the energy consumption efficiency criteria, temperature of 1100°C and strain rate of 0.001 s-1 were proposed as the optimal hot deformation conditions for the Ti-48Al-2Cr-2Nb intermetallic with an efficiency of 48.8%.
Keywords
Ti-48Al-2Cr-2Nb
Hot Deformation
Duplex Structure
Strain Rate Sensitivity
Dynamic Recrystallization
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