발간논문

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Vol.28, No.5, 443 ~ 453, 1990
Title
High Temperature Deformation Behavior of Sic Whisker Reinforced Al - Cu - Mg Alloy composite
김태수Tae Soo Kim, 김동훈Tong Hoon Kim
Abstract
The effect of SiC whisker reinforcement on the high temperature tensile properties and deformation behavior of Al-Cu-Mg alloys was investigated using high temperature tensile test and scanning electron microscopy. The tensile strength of the SiC whisker reinforced composites was not greater than that of the matrix alloys without whisker and decreased more rapidly with increasing temperature. Whereas the tensile stength of matrix alloys decreased abruptly above the incipient melting temperature, that of the composites decreased continuously at that temperature and above without abrupt change. The elongation-to-failure of the extruded Al-Cu-Mg-SiC_w composites increased with increasing temperature and reached the maximum value near the incipient melting temperature of matrix alloys. Addition of Mg to Al-Cu-SiC_w composites increased the elongation-to-failure at the incipient melting temperature of matrix alloys and above. The elongation-to-failure of the rolled Al 2024-20SiC_w composite near the incipient melting temperature of matrix alloy increased with increasing strain rate and reached the maximum strain of 100% at a strain rate 0.2s^(-1) Fractographs for the composites revealed that the final fracture at low strain rates was mainly due to the elongation of matrix and that at high strain rate was mainly due to the whisker-matrix sliding. An theoretical approach was suggested to explain the high temperature deformation behavior of the composite. Predictions by the proposed model for the strain rate sensitivity and fracture mode transition with stain rates were well consistent with the experimental results.
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