Microstructure of TiAl alloy prepared by
intense plastic deformation and subsequent
reaction sintering
intense plastic deformation and subsequent
reaction sintering
(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)
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