Abstract: Cu-Al2O3 composite powder was obtained by ball milling, using Cu-Al alloy powder and CuO powder as the raw materials. The effect of milling time on powder particles’ morphology, size, phase, crystalline size and internal strains were observed and analyzed by scanning electron microscope (SEM), X-ray diffraction (XRD) and transmission electron microscope (TEM), etc. Meanwhile, powder microstructure evolution during ball milling was investigated, and the in-situ formation mechanism of Al2O3 nanoparticles was revealed. The result showed that the final product of ball milling was Cu and Al2O3.The process of in-situ formation of Al2O3 nanoparticles is controlled by diffusion. With the increase of milling time, the powder particles shape changed from ellipsoid to laminar and equiaxial, particle size first increased and then decreased, interlamellar spacing decreased continuously, the powder grains refined and the internal strain increased gradually. These changes provide a fast-track for atom diffusion. At the same time, the CuO particles in Cu-Al alloy powder formed numerous diffusion-reaction couples to reduce the reaction activation energy and promote the in-situ formation of Al2O3 nanoparticles.
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2020, Vol. 34 
