발간논문

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Vol.35, No.8, 977 ~ 987, 1997
Title
Hot Workability and Static Softening of SiCp / Al-12Si Composites
고병철 , 유연철 Byung Chul Ko , Yeon Chul Yoo
Abstract
Hot workability and static softening of the 10vol.% SiC_p reinforced Al-12Si matrix composites and Al-12Si matrix alloy were studied by hot torsion tests at temperatures from 270 to 520℃, and strain rates from 1.2×10^(-3) to 2.16×10^(-1)/sec, respectively. Detailed analyses of flow curves and deformed microstructures were made to identify the hot restoration mechanism of the composites and the critical strain (ε_0) for the DRX (dynamic recrystallization) was evaluated from the work hardening rate and peak stress. The critical deformation condition for minimizing damage of the SiC_p reinforcements and Si precipitates of the composites could be obtained from the relationship between Zener-Hollomon parameter (Z=εexp(Q/RT) and peak stress (σ_p). Isothermal interrupted deformation was also performed to investigate the effect of static softening on the hot ductility of the composites. During the isothermal interrupted-deformation, the ductility of the composites was more enhanced by introducing the SRV (static recovery) than SRX (static recrystallization) and grain growth.
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