本文对SiC_w/6061Al复合材料的组织与性能进行了研究,结果表明,压铸法可以制备出高强度、高模量的各向同性复合材料,挤压使复合材料的强度由压铸态的582MPa提高到639MPa,并使材料变为各向异性,这可以由晶须的定向排列和基体的高密度位错得到解释。复合材料的抗高温性能要比基体高150℃,透射电镜观察还发现,层错是SiC晶须中常见的一种面缺陷。
The SiC_w/6061Al composite prepared by squeeze casting has a combi-nation of superior room temperature specific strength and modulus together with ex-cellent thermal properties. The extrusion can make an improvement on the strengthand ductility of the composite from 582 MPa as squeeze casted up to 639 MPa, andon the transformation from isotropic to the anisotropic structure. This seems to beexplained by the orientation of whiskers and the densification of dislocations inmatrix. TEM observation indicates that the stacking fault is the usual planar defecton the SiC_w surface.
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