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制备了碳纤维及ＳｉＣ晶须增强的Ｍｇ８Ｌｉ１Ａｌ 基复合材料。利用透射电镜、高分辨电子显微镜研究了Ｍｇ８Ｌｉ１Ａｌ／ＳｉＣｗ 复合材料的界面结构， 发现ＳｉＣ晶须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，ＳｉＣ晶须强化Ｍｇ８Ｌｉ１Ａｌ 合金使抗拉强度提高５０％ ， 固溶时效处理使Ｍｇ８Ｌｉ１Ａｌ／ＳｉＣｗ 复合材料的抗拉强度提高到２７８ ＭＰａ， 比铸态提高了４１－３％ 。讨论了碳纤维、Ａｌ２Ｏ３ 纤维、ＳｉＣ晶须与镁锂合金的热力学相容性， 表明ＳｉＣ 晶须与镁锂合金发生反应的热力学驱动力很小。
Preparation of carbon fiber and SiC whisker reinforced Mg8Li1Al-based composite material. The interfacial structure of Mg8Li1Al / SiCw composites was studied by transmission electron microscopy and high resolution electron microscopy. It was found that SiC whiskers bonded well with the matrix alloy without obvious reactants. Tensile test results show that the tensile strength of SiC whisker reinforced Mg8Li1Al alloy is increased by 50%, and the solution tensile strength of Mg8Li1Al / SiCw composite is increased to 278 MPa by solution aging treatment, which is 41-3% higher than that of as-cast. The thermodynamic compatibility of carbon fiber, Al2O3 fiber and SiC whisker with Mg-Li alloy was discussed. The thermodynamics driving force of SiC whisker and Mg-Li alloy was very low.