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Internal Stress Evaluation by Attenuation Measurements during Room Temperature Creep in 5N Aluminium

  • A. Vincent
  • S. Djeroud
  • R. Fougeres

Abstract

It is generally well established that the resolved shear stress, due to an applied tensile stress which is large enough in order to induce long-range dislocation movements, can be divided in two components: the first one, τeff., originates from short-range stress obstacles which can be overcome with the help of thermal energy and the second one is due to long-range stress obstacles for which thermal activation is not effective; this latter component leads to the so called “internal stress” (τi). In the past, from relaxation /1/ or creep /2/ tests, various methods have been proposed in order to determine this internal stress. More recently, some evaluations of τi have been carried out by measuring the dislocation loop radius of curvature during T.E.M. observations /3/.

Keywords

Point Defect Internal Stress Dislocation Loop Ultrasonic Attenuation Applied Tensile Stress 
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Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • A. Vincent
    • 1
    • 2
  • S. Djeroud
    • 2
  • R. Fougeres
    • 2
  1. 1.Groupes d’Etudes de Métallurgie Physique et de Physique des Matériaux (UA CNRS 341)France
  2. 2.Laboratoire de Traitement du Signal et d’UltrasonsVilleurbanne CedexFrance

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