【摘要】 本文工作集中于SiC_w/Al复合材料的制备、材料的微观结构分析和高温瞬时拉伸试验三方面。结果表明,用高压铸造法制造SiC_w/Al复合材料是可行的。用该方法制得的复合材料造价低廉,界面结合良好,具有优良的室温、高温强度和足夠的塑性。更多还原

【Abstract】 The manufacturing process for the metal matrix composites of SiC whisker/aluminum alloy is being developed. The process consists of the fabrication of the whisker’s preform and the fabrication of the composite billet by liquid metal infiltration. In this way the composites with 17％ volume fraction of SiC whisker are manufactured. The microstructures of the as-fabricated composites have been examined. The whiskers in the as-fabricated composites are random which results in the isotropic mechanical properties of the composites. Both the tensile strength and the elastic modulus of the asfabricated composites were improved obviously compared to the material with no whisker and the marked strengthening effect by whiskers are observed. Experimental results show that the tensile strength of SiC whisker reinforced composites changes with the temperature in same tendency as that of the matrix alloy. SiC whisker reinforced composites appear good high-temperature tensile strength compared to the matrix. The bond between the whiskers and matrix is perfect.更多还原