Influence of pressure on the solid state phase transformation of Cu–Al–Bi alloy

The solid state phase transformation of Cu–Al–Bi alloy under high pressure was investigated by x-ray diffraction, energy dispersive spectroscopy and transmission electron microscopy. Experimental results show that the initial crystalline phase in the Cu–Al–Bi alloy annealed at 750℃ under the pressures in the range of 0–6 GPa is \alpha-Cu solid solution (named as \alpha-Cu phase below), and high pressure has a great influence on the crystallisation process of the Cu–Al–Bi alloy. The grain size of the \alpha-Cu phase decreases with increasing pressure as the pressure is below about 3 GPa, and then increases (P >3 GPa). The mechanism for the effects of high pressure on the crystallisation process of the alloy has been discussed.