Characterization of TiAl Prealloyed Powders for Electron Beam Additive Manufacturing

Author of the article:FAN Zizhao1 , LI Jinshan1 , CHEN Wei2 , YANG Yang2 , GAO Wenqiang1 , TANG Bin1

Author's Workplace：1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China; 2. AVIC Manufacturing Technology Institute, Beijing 100024, China

Key Words：TiAl; electrode induction gas atomization method; selective electron beam melting technology; prealloyed powders; morphology

Abstract：Ti-48Al-2Cr-2Nb and Ti-47.5Al-6.8Nb-0.2W prealloyed powders were prepared by crucible-free electrode induction gas atomization (EIGA), and the characteristics of the powders were compared. The results show that the two kinds of TiAl prealloyed powders have good sphericity and the particle size distribution conforms to a normal distribution. The gas content of both powders is low, of which the content of oxygen is consistent, while the contents of nitrogen and hydrogen in Ti-47.5Al-6.8Nb-0.2W prealloyed powder are high. The microstructure morphology of the powders shows dendritic crystallines, and the XRD analysis shows that the main phase of the Ti-48Al-2Cr-2Nb prealloyed powder is the γ phase, while the main phase of the Ti-47.5Al-6.8Nb-0.2W prealloyed powder is the α2 phase.