발간논문

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Vol.35, No.9, 1226 ~ 1233, 1997
Title
The Effect of Fabrication Process on Tensile Properties of The Eletroless Coated SiC Particle Reinforced Al-based Composites
서병권 , 이두면 , 장갑돈 , 이지환 Byoung Kwon Suh , Doo Myun Lee , Gap Don Jang , Chi Hwan Lee
Abstract
The effect of extrusion on tensile properties of the Ni-P coated SiC particle reinforced Al composites has been studied. The X-ray diffraction and DTA analysis revealed that the amorphous Ni deposits is crystallized into brittle Ni₃P intermetallic compound and Ni crystallite. After hot presssing, the tensile strength and elongation of composites reinforced with Ni-P coated SiC particle were decreased comparing with the uncoated SiC particle reinforced composites. It was suggested that the Ni₃P compound layer in Ni-P deposits acts as a crack initiation site during tensile loading. After hot extrusion, the tensile strength of the Ni-P coated composites was higher than that of uncoated composites, because Ni₃P intermetallic compound layers in Ni-P deposits were pulverized and then dispersed to the matrix by plastic deformation of Al matrix during hot extrusion. It is obviously shown that the micro-vickers hardness of the Ni-P coated composites is higher than that of uncoated composites. This is due to the disperssion of Ni₃P compound in AI matrix during extrusion process.
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