대한기계학회논문집A (Transactions of the Korean Society of Mechanical Engineers A)

대한기계학회 (The Korean Society of Mechanical Engineers)
권호 표지

알루미늄 고용체 합금의 고온변형 거동에 관한 연구

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김호경
Kim, Ho-Gyeong

  • 발행 : 1997.01.01

초록

The creep characteristics of an Al-5wt.% Ag alloy including the stress exponent, the activation energy for creep and the shape of the creep curve were investigated at a normalized shear stress extending from $ 10^{-5}{\;}to{\;}3{\times}10^{-4}$ and in the temperature range of 640-873 K, where silver is in solid solution. The experimental results shows that the stress exponent is 4.6, the activation energy is 141 kJ/mole, and the stacking fault energy is $180{\;}mJ/m^2$, suggesting that the creep behavior of Al-5 wt.% Ag is similiar to that reported for pure aluminum, and that under the current experimental conditions, the alloy behaves as a class II(metal class). The above creep characteristics obtained for Al-5 wt.% Ag are discussed in the light of prediction regarding deformation mechanisms in solid solution alloys.

키워드

이중전단형 시편;응력지수;정상상태 크리프속도;활성화에너지;적층결함에너지;표준화크리프속도;class II 합금;평형 기준식

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