Effect of Heat Treatment Temperature and Rolling on Microstructure and Mechanical Property of Powder Metallurgy Ti43Al9V(Y) Alloy in Electron Backscattering Diffraction

Abstract:

TiAl alloy is a high-temperature structural material that is highly sensitive to microstructure. Different hot working or heat treatment processes can refine the grain, release stress, and adjust the phase type and distribution. This study investigates the effect of heat treatment and rolling on the microstructure of powder metallurgy TiAl alloys in detail, resulting in TiAl alloys with high plasticity achieved through hot pack rolling. The heat treatment temperature was set between 1290°C and 1330°C, with a temperature interval of 10°C, a holding time of 30 minutes, and cooling with the furnace. Spheroidization of the grains occurred at 1310°C. Phase analysis of the TiAl alloy was conducted after heat treatment at 1290°C, 1310°C, and 1330°C. The microstructure of the TiAl alloy after heat treatment at 1290°C still consisted of γ phase and B2 phase, with no significant change in the content of γ phase and B2 phase. After heat treatment at 1310°C, numerous α₂ phases abruptly emerged in the microstructure. The TiAl sheet exhibits an elongation of 3.6% at room temperature, which increases to 65% at 700°C. The study investigated the phase transformation process, grain morphology, and microstructure evolution of powder metallurgy TiAl alloy under different heat treatment temperatures and rolling. The relationship between microstructure and temperature of powder metallurgy TiAl alloy was established using electron backscattering diffraction.

• Periodical: Materials Science Forum (Volume 1146)
• Pages: 21-28
• DOI: https://doi.org/10.4028/p-Pz8Fnd
• Online since: March 2025
• Authors: Yu Yong Chen, Dong Dong Zhang*, Tong Zheng He, Ping Sun, L. Y. Bao
• Keywords: Heat Treatment, Hot Pack Rolling, Powder Metallurgy, TiAl

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