발간논문

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Vol.39, No.2, 199 ~ 206, 2001
Title
Deformation Behavior of Al-Mg/B4C and Al-Mg/TiC Composites Fabricated by Pressureless Infiltration Technique
김종민Jong Min Kim,맹덕영Duck Young Maeng,홍순익Sun Ig Hong,권훈Hoon Kwon
Abstract
Deformation behaviors of Al-MgB₄C and Al-Mg/TiC composites fabricated by pressureless infiltration technique were studied in the temperature range between 298K and 773K. The strength decreased similarly for Al-MgB₄C and Al-Mg/TiC composites, but the ductility of Al-Mg/B₄C was higher and reached to 150% at 773K. The stress exponents and the activation energy for high temperature deformation were observed to be 7∼8 and 180∼220 KJ/mole respectively. The relatively high stress exponent and high activation energy can be explained in terms of dynamic solution-dislocation interaction in the matrix of Al-Mg composites. The activation volume for high temperature deformation of Al-Mg matrix composites increased from 50-80b³ at 573K to 200-800b³ at 773K. The rate controlling mechanism of the deformation for Al-Mg matrix composites was well explained by the dislocation trough model in which the segregation of alloying elements on dislocation determines the activation length.
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