Abstract
Aluminum boron carbide composite strip was prepared by semi-solid stirring and rheo-rolling, and the effects of process parameters on microstructure of A356–5wt.%B4C composite strip were studied. The results showed that the distribution of B4C particles in the matrix became homogeneous, and the average diameter of α-Al and its roundness decreased with the increase of the stirring speed and the stirring time as well as the decrease of the stirring temperature. The average diameter of the primary α-Al grain increased with the increase of the roll speed. When the stirring speed was 500 rpm, the stirring time was 20 min, the stirring temperature was 853 K (580 °C), and the roll speed was 0.2 m/s, the microstructure of A356–5wt.%B4C composite strip was mainly composed of spherical or rosette α-Al grains, and the distribution of B4C particles was homogeneous. The hardness of A356–5wt.%B4C composite strip was 98 HV, and the ultimate tensile strength and elongation were 186 MPa and 1.8%, respectively. The hardness was improved by 25% comparing with casting alloy A356. The ultimate tensile strength and elongation were improved, respectively, by 28.3% and 5.9%.
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