Document Type : Original Research Article
Authors
1
PhD Student in Materials Engineering, Faculty of Materials and Manufacturing Technologies, Malek Ashtar University of Technology, Tehran, Iran
2
Faculty of Material & Manufacturing Technologies, Malek Ashtar University of Technology, Tehran, Iran
3
Assistance Professor, Faculty of Metallurgy and Material Engineering, Hamedan University of Technology, Hamedan, Iran
10.22034/frj.2025.481523.1201
Abstract
The aim of the present study is to investigate the occurrence of the α2 to α phase transformation during hot compressive deformation of Ti-48Al-2Cr-2Nb intermetallic. To this end, hot compression tests were performed on samples of the intermetallic at temperatures of 1000, 1050, 1100, and 1150°C, with a constant strain rate of 0.01 s⁻¹. After hot deformation at 1000 and 1050°C, tall peaks of the γ phase, along with relatively shorter peaks of the α2 phase, were observed in the X-ray diffraction analysis results. With the increase in deformation temperature to 1100 and 1150°C, the α2 phase peaks disappeared, and peaks of the α phase emerged. After hot deformation at 1000 and 1050°C, bent and broken lamellae, along with some recrystallized grains, were observed in the microstructure. However, with the increase in hot deformation temperature to 1100°C, the onset of transformation led to the decomposition of the α2 phase, creating decomposed regions rich in the γ phase, thus increasing the amount of this phase in the microstructure. Therefore, based on the above results, it can be concluded that the ordering transformation begins in the temperature range of 1050 to 1100°C and completes in the range of 1100 to 1150°C.
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