Microstructure and Tensile Property of (SiCp+Al2O3f)/2024Al Composites Fabricated by Vacuum Pressure Infiltration and Hot Pressing Sintering:a Comparative Study
XU Hui, ZHAO Yang, REN Shubin, QU Xuanhui
Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083
Abstract: In this paper, (40%SiCp+10%Al2O3f)/2024Al composites were fabricated by vacuum pressure infiltration method and hot pressing sintering method. The resultant two kinds of composites exhibit the room-temperature tensile strength of 364 MPa and 310 MPa, and compactness of 98.78% and 96.42%, respectively. SiC particles aggregation in the hot-pressing sintered compo-sites was revealed by metallographic observation. The comparative TEM analysis confirmed the presence of micropores at the interface of hot-pressing sintered composites which results in compactness decrement, and meanwhile, the favorable matrix-reinforcement interface bonding of the vacuum pressure infiltration composites. This mainly contributes to the better mechanical properties of the vacuum pressure infiltration composites as compared to the hot-pressing sintered ones.
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2018, Vol. 32 
