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 α-Cu solid solution （named as α-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 α-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.