Densification and microstructure of the gas-atomized Cu-15%Ga alloy powder by cross-roll rolling.

Abstract

In this study, the gas-atomized Cu-15%Ga alloy powder was consolidated by cross-roll rolling using copper can without crack and oxidation, where the roll axis was tilted by 5 degrees against TD in the RD-TD plane. Microstructures of formed Cu-15%Ga alloy were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) and optical microscopy (OM). Density of the cross-roll rolled specimens was measured using Archemeded method. Also, the porosity was examined by an image analyzer. The porosity of the cross-roll rolled samples with rolling reduction of 60% was approximately 6.7 times lower than that of the CR-rolled samples at 40% at a rolling temperature to 850 degrees C. The specimen obtained with 5 degrees of cross-roll rolling degree and 60% of rolling reduction ratio at 850 degrees C was above 99% to the theoretical density and an average grain size was 19.2 μm.