中國有色金屬學報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 12 No. 4 August 2002 |
intense plastic deformation and subsequent
reaction sintering
HE Wen-xiong(賀文雄)1, LIU Zu-yan(劉祖巖)1
（1. Department of Materials Science and Engineering,
Harbin Institute of Technology, Harbin 150001, China；
2. College of Mechanical Engineering, South China University of Technology,
Guangzhou 510640, China）
Abstract:TiAl alloy was prepared by intense plastic deformation and subsequent reaction sintering. The effect of plastic deformation on the microstructure of sintered TiAl alloy was investigated using energy dispersive X-ray spectroscopy ( EDS), optical microscopy and transmission electron microscopy (TEM). The results show that the intense plastic deformation of reacting Ti and Al phases caused by high energy ball milling refines the as-sintered microstructure. The longer the milling time, the finer the grain size of γ and lamellar (α2+γ) phases. The finer grain size improves the properties of the TiAl alloy. It is also found that the volume fraction of lamellar (α2+γ) phases increases first, then decreases with increasing milling time. Based on the experimental results theoretical discussion was presented.
Key words: TiAl alloy；high energy ball milling；reaction sintering；microstructure
