발간논문

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Vol.38, No.1, 98 ~ 105, 2000
Title
Pesearch Paper / Composite Materials : High Temperature Deformation Behaviour of SiCp / Al 6061 Composites
박두현Do Hyun Park,고병철Byung Chul Ko,유연철Yeon Chul Yoo
Abstract
The high temperature deformation behavior of 15 vol.% SiC_p/Al6061 composites has been studied in the temperature range of 300-550℃ and in the strain rate range of 0.1-3.0/sec by employing the concept of deformation efficiency from the stress-strain data as a function of temperature(T) and strain rate(ε˙). The strain rate sensitivity(m) of the composites is evaluated and calculated the deformation efficiency(η)[η= 2ｍ/(ｍ+1)] to obtain deformation maps, which were obtained from the values of deformation efficiency. The composite reinforced with 8㎛ SiC_p exhibited a domain of dynamic recrystallization(DRX) with a peak efficiency of 40% at the temperature range of 450∼500℃ and the strain rate range of 0.2∼0.5/sec. On the other hand, the composite reinforced with 1 ㎛ SiC_p showed the DRX domain, which was moved to lower temperature of 370-430℃. These materials undergo microstructural instabilities at -370℃ under the high strain rates of 1.0 and 3.0/sec as predicted by the continuum instability criterion. The characteristic of these results has been investigated with the help of microstructural observation.
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