Effect of Low Frequency Electromagnetic Casting on Microstructure and Properties of n-SiCp/2024 Aluminum Matrix Composite
GAO Wenlin1,2, BAI Yaofang3,WANG Hailong1,2, SUN Gang1,2, LU Zheng1,2
1 Beijing Institute of Aeronautical Materials, Beijing 100095; 2 Beijing Engineering Research Center of Advanced Aluminum Alloys and Application, Beijing 100095; 3 Beijing North Vehicle Group Corporation, Beijing 100072
Abstract: The research studied two different kinds of n-SiCp/2024 aluminum matrix composite ingots, with hot backward extrusion and T6 heat treatment, which were processed by low frequency electromagnetic casting (LFEC) and conventional semi-continuous casting (DC) respectively. The OM, TEM, and tensile test were adopted to study the microstructure and mechanical properties variations of the two different kinds of n-SiCp/2024 aluminum matrix composites. The research proved that there were segregations on part of the DC processed n-SiCp/2024 aluminum matrix composite ingots' surface. Most of them located near the grain boundaries in clumps, while only very little of them located within the grain. The LFEC processed n-SiCp/2024 aluminum matrix composite, however, had practically no n-SiCp in clumps and had a clear grain boundary, a uniform microstructure, and an obvious grain refining effect. LFEC process could refine the grain size of n-SiCp/2024 aluminum matrix composite ingots effectively, and its electromagnetic stirring relieved clumps of n-SiCp grain significantly. Compared with the conventional DC process, the LFEC process could improve both the strength and the ductility.
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2017, Vol. 31 
