1 Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093; 2 Anhui Yingliu Co., Ltd., Hefei 230000
Abstract: The main difficulties of preparing the B4C reinforced Al matrix composite are uniform distribution and interfacial bonding of B4C particles in Al matrix. In this study, the composite powder of B4C/Al was fabricated by high-energy ball milling. The effects of rotational speed and milling time on structural evolution and uniform distribution of B4C/Al composite powder were investigated. The results indicate that as the rotational speed up, the composite powder gain more energy from collision with the ball. In addition, the reinforced particles are broken instantly, which lead to large plastic deformation of Al matrix. With the extension of mil-ling time, the broken B4C particles are gradually uniformly distributed in Al matrix and bond with the matrix. This is conducive to uniform distribution and interfacial bonding of the powder. During process of milling, brittle fracture of B4C particles happen along the edge. When the shape of Al powder change from spherical to lamella, B4C particles are embedded in Al matrix, forming a composite powder where B4C reinforcements are wrapped in the flaky Al matrix powder. When the rotational speed is 600/800 r/min (alternating speed with alternating frequency of 1 min) and the milling time is 2 h, the size of B4C/Al composite powder is refined, and B4C particles are uniformly distributed in Al matrix with strong interfacial bonding.
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2018, Vol. 32 
