발간논문

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Vol.35, No.9, 1137 ~ 1146, 1997
Title
Load Relaxation Behavior of Pure Al
신광섭 , 하태권 , 장영원 Kwang Sup Shin , Tae Kwon Ha , Young Won Chang
Abstract
The purpose of this study is to investigate the effect of barrier structure on the dislocation motion, which is in turn believed to determine the permeability parameter p of plastic equation of state. It has also been intended to verify whether there exists a mechanical equation of state for Al single and poly crystals. A series of load relaxation tests was conducted on A1 single and poly crystals. In addition, tests at various temperatures were performed to investigate the temperature effect on the flow behavior. The test results are then analyzed using the recently proposed internal variable theory which has been successfully applied to many other materials. It has been confirmed in this study that the mechanical equation of state does exist in both single and poly crystals of Al. The permeability parameter p was obtained as a constant, p = 0.15 for polycrystalline Al as in the other studies on cubic materials, while that of single crystal was obtained as p = 0.23. As the test temperature increased, the flow curves appeared to shift into the lower stress and faster strain rates region.
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