Mcrostructure of TiAl alloy prepared by intense plastic deformation and subsequent reaction singering

TiAl alloy was prepared by intense plastic deformation and subsequent reaction sintering.The effect of plasetic 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 caued 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 th volume fraction of lamellar(α2 γ)phases increases first,then decreases with increasing milling time.Based on the experimental results theoretical discussion was presented.