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利用搅拌铸造法制备出不同体积分数的YAl2p/Mg-14Li-3Al复合材料,然后将其挤压成薄壁管材,通过金相显微镜、扫描电镜和万能试验机等手段研究了热挤压变形对复合材料显微组织及力学性能的影响。结果表明,通过热挤压变形,YAl2p增强体颗粒的分散性得到改善,复合材料的显微组织明显细化,力学性能显著提升。其中挤压态1vol%YAl2p/Mg-14Li-3Al复合材料与铸态相比,抗拉强度和屈服强度均提高了60%以上,塑性得到改善。在挤压的过程中,复合材料的挤压力峰值与Mg-14Li-3Al合金相比略有增加,且挤压力峰值达到的时间存在滞后的现象。
YAl2p / Mg-14Li-3Al composites with different volume fractions were prepared by stirring casting method and then extruded into thin-walled tubes. The effects of hot extrusion deformation on the properties of YAl2p / Mg-14Li-3Al composites were studied by means of metallographic microscope, scanning electron microscopy and universal testing machine Effect of Composite Microstructure and Mechanical Properties. The results show that the dispersibility of YAl2p reinforced particles is improved by hot extrusion deformation, the microstructure of the composite is obviously refined and the mechanical properties are significantly improved. The tensile strength and yield strength of the 1vol% YAl2p / Mg-14Li-3Al composites increased by more than 60% compared with the as-cast ones, and the plasticity improved. During the extrusion process, the peak extrusion pressure of the composites increased slightly compared with that of the Mg-14Li-3Al alloy, and there was a hysteresis in the peak of the extrusion pressure.