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A Study on the High Temperature Deformation Behavior of a Solid Solution Aluminium Alloy

알루미늄 고용체 합금의 고온변형 거동에 관한 연구

  • Kim, Ho-Gyeong (Dept.of Automotive Engineering, Seoul National University of Technology) ;
  • 김호경 (서울산업대학교 자동차공학과) ;
  • Published : 1997.01.01

Abstract

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.

Keywords

Double Shear Geometry Specimen;Stress Exponent;Steady State Creep Rate;Activation Energy;Stacking Fault Energy;Normalized Creep Rate;Class II Alloy;Deformation Cirterion