The sintering densification, microstructure and mechanical properties of Ti–48Al–2Cr–2Nb by a small addition of Sn–Al powder

Journal of Materials Research and Technology

Wei Xu¹  Tailong Hui²  Yu Pan²  Muhammad Arif Mughal²  Ce Zhang²  Xin Lu²  Jiazhen Zhang³  Shuaihua Zhang⁴ 

[1] Beijing Xinghang Electro-mechanical Equipment Co Ltd, Beijing, 100074, China;Beijing Advanced Innovation Center for Materials Genome Engineering, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China;Institute of Artificial Intelligence, University of Science and Technology Beijing, Beijing, 100083, China;Institute of Engineering Technology, National Engineering Research Center for Advanced Rolling Technology, National Engineering Research Center for Flat Rolling Equipment, University of Science and Technology Beijing, Beijing, 100083, China;

关键词: Titanium aluminide;    Liquid sintering;    Wettability;    Microstructure;    Mechanical properties;   

DOI  :  

来源: DOAJ

【 摘 要 】

TiAl alloys are difficult to obtain high density through traditional pressing and sintering process. Sn is a promising liquid-phase sintering addition for TiAl alloys; however, the further studies have elaborated that the liquid phase sintering of Sn is limited due to poor wettability between TiAl and melt Sn. Based on it, this study adopts Sn–Al powder addition instead of pure Sn powder. The results describe that a small amount of active Al enhanced the wettability of the Sn droplets to the TiAl matrix, thereby further promoting the liquid phase sintering effect of the addition of Sn. The sample sintered at 1320–1350 °C has a density excess of 95%, near γ or duplex microstructure with small proportion of lamellar colonies. Through subsequent non-encapsulation HIP, the fine-grained structure is maintained at the same time to reach full density, which enables the as-sintered samples to obtain moderate tensile properties at room temperatures (UST = 520 ± 5 MPa, YS = 401 ± 7 MPa, EL = 1.33 ± 0.1).

【 授权许可】

Unknown