| Citation: | QIU Xiangru, WU Guoqing, PAN Yingcai, et al. Effect of hot extrusion on structure and properties of YAl2p/Mg-14Li-3Al composites[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(12): 2547-2553. doi: 10.13700/j.bh.1001-5965.2016.0900(in Chinese)
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YAl2p/Mg-14Li-3Al composites with different volume fraction were fabricated by stir casting, and then the as-cast ingots were extruded as composite thin-walled tubes with the defined experimental parameters. Effects of hot extrusion deformation on microstructure and mechanical properties of YAl2p/Mg-14Li-3Al composites were investigated by optical microscope, scanning electronic microscope, tensile tests and so on. The results show that hot extrusion deformation can effectively improve the YAl2p distribution and the mechanical properties of the composites. In addition, the grains of matrix are significantly refined after hot extrusion. For as-extruded YAl2p/Mg-14Li-3Al composites with volume fraction of 1%, compared with as-cast condition, the tensile strength and the yield strength are both improved by over 60%, and the ductility is improved. In the process of hot extrusion, the extrusion pressure peak of the composite is improved slightly compared with Mg-14Li-3Al alloy, and the time of the peak pressure of the composite lags behind the alloy.
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