Influence of Hot Extrusion on the Microstructure, Tensile and Wear Properties of Mg–5Sb–xSiC Hybrid Composites

다국어 초록 (Multilingual Abstract)

The structure, hardness, tensile and wear behavior of Mg–5Sb–xSiC hybrid composites experimented where the amountof SiC particles were 1, 3, and 5 wt% SiCp before and after applying hot extrusion process. Micron size SiC particles wereadded to Mg–5Sb alloy via stir casting technique to form both Mg3Sb2and SiC particles in the as-cast microstructures.
Although SiC addition reduced the grain size of the Mg–5%Sb in-situ metal matrix composite (MMC), no improvement wasobserved on ultimate tensile strength (UTS) and the ductility (EL.%) in the as-cast state. The use of the extrusion processled to a remarkable fracturing of Mg3Sb2intermetallic along the extrusion direction, grain refinement, and reduction in thesize of SiC clusters. The optimal amount of SiC was found to be 3 wt%, which reduced the grain size from ~ 827 to ~ 4 μmand promoted the UTS amounts from 120 to 244 MPa for as-cast and hot extruded composites. Besides, the enhancementof yield strength of extruded MMCs was rationalized depending on the grain size compared to the as-cast condition. Thefractography of the as-cast composites revealed more cleavage planes in contrast with hot extruded composites, which provedmuch more dimples. It was also found that the use of hard SiC particles in hybrid composite improved wear properties justin the extruded state. According to observations, in various sliding test conditions, the abrasive, oxidation and delaminationare mostly operated in combination.

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