Fabrication and Properties of Gas Atomized Gamma Titanium Aluminide Powders and PM Processing

Abstract:

Pre-alloyed gamma titanium aluminide powders were fabricated by argon gas atomization. The powder was hot isostatic pressed (HIP) at 1200°Cand 150MPa for 3h to obtain full density compact. The properties of the powders and the HIP’ed compacts were investigated in this work. The microstructure of the powder exhibited dendrite and cellular mixed image, resulted from rapid solidification and independent of particle size. The microstructural transition from cell to dendrite could be readily represented in a droplet or the droplets of different size. The transition was the result of the decrease of undercooling. XRD analysis result showed that the powder consisted of α₂ phase and γ phase, coarse powder was mostly γ phase, while fine powder mostly α₂ phase. After HIP, the near gamma microstructure showed an average γ-TiAl grains of approximately 6μm.

• Periodical: Materials Science Forum (Volume 898)
• Pages: 328-333
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.898.328
• Online since: June 2017
• Authors: Na Liu*, Zhou Li, Wen Yong Xu, Liang Zheng, Yang Liu
• Keywords: Gas Atomization, Hot Isostatic Pressing (HIP), Powder Metallurgical, Titanium Aluminide

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