발간논문

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Vol.39, No.5, 511 ~ 521, 2001
Title
Mechanical Behaviors : Effect of Matrix Composition on High Temperature Creep Properties of 20 vol. % SiCp / Al Alloy Composites Manufactured by the Pressureless Infiltration Method
송명훈Myong Hun Song,권훈Hoon Kwon,김용석Yong Suk Kim
Abstract
High temperature creep behaviour of 20 vol.% SiC particle reinforced 5052 Al, 6061 Al and 7075 Al alloy matrix composites was studied at temperatures of 633, 663, and 693K under the applied stress range of 25∼100 ㎫. The composites were manufactured by the pressureless infiltration technique. The composites showed high apparent stress exponent and activation energy. The 7075 Al matrix composite showed the highest creep strength at 633K, while at 693K the 5052 Al matrix composite had the highest creep resistance. The creep strength of the 7075 Al matrix composite decreased rapidly with increase of the temperature. True stress exponent of the composites was measured as 5 and major creep mechanism of the composites was found to be lattice self-diffusion of the matrix alloy. Different temperature-dependence of the composites` creep strength and the threshold stress (including its origin) were attributed to different amount of precipitates and aluminum nitrides in the matrix alloys.
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