【摘要】 制备了YAl2稀土金属间化合物颗粒增强的镁锂基复合材料。利用透射电镜、高分辨电子显微镜及X射线衍射仪研究了YAl2p/MgLiAl复合材料热稳定性,结果表明,经过400℃30h热处理,YAl2颗粒与基体合金界面结合良好,没有明显的反应物。拉伸实验结果表明,热处理处理后YAl2p/MgLiAl复合材料的抗拉强度为220Mpa,延伸率为12%,分别比铸态提高了11%和20%。讨论了YAl2颗粒与镁锂合金的热力学相容性,表明YAl2颗粒与镁锂合金发生反应的热力学驱动力很小。更多还原

【Abstract】 The thermal stability of YAL2p/MgLiAl composites was studied by XRD,TEM,HREM and material tensile teat.The results show that,there are no detectable products on the interface after fabrication or subsequent heat treatment,and the interface between YAl2 and MgLiAl alloy is not weakened after the heat treatment.The tensile strength and elongation of the composite after being solution treated at 350℃ for 10h exceed those of the as-cast composite 11% and 20%,respectively.The Gibbs free energy was calculated to assess the thermodynamics driving force for the reaction of YAL2 and MgLiAl matrix.更多还原