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On the stress sensitivity parameter in high temperature creep of Al-3 wt% Mg

  • A. R. Ali
  • F. M. Mansy
  • G. Said
Condensed Matter
  • 29 Downloads

Abstract

Stress dependence of creep rates, internal and effective stress, as well as the apparent instantaneous strain associated with sudden stress changes during the steady-state creep of Al-3 wt% Mg were studied. The transition in stress exponentn is attributed to the change in the stress dependence of dislocation density and does not necessarily correspond to the change in the creep mechanism. The effective stress exponentn* is considered as the identifying parameter for the process controlliag the creep mechanism. The absence of the instantaneous plastic strain upon stress changes during creep shows that creep is mainly controlled by viscous glide motion of dislocations.

Keywords

Applied Stress Effective Stress Creep Rate Stress Change Stress Exponent 
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Copyright information

© with the authors 1981

Authors and Affiliations

  • A. R. Ali
    • 1
  • F. M. Mansy
    • 1
  • G. Said
    • 2
  1. 1.Department of Physics, Faculty of ScienceUniversity of CairoCairoEgypt
  2. 2.Department of Physics, Faculty of Education, El-FayoumUniversity of CairoCairoEgypt

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