Title of article :
Dynamic manifestation of point defects on flow stress and the role of grain boundary as vacancy sinks
Author/Authors :
Saimoto، نويسنده , , S.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2008
Pages :
4
From page :
67
To page :
70
Abstract :
The early dislocation mechanics prediction of point-defect generation during deformation and its possible effect on the flow stress were examined using polycrystalline aluminum in which the grain boundaries were sealed and non-sealed with iron solutes. The up- and down-changes of the strain rate clearly demonstrate that vacancy mobility dramatically affects the dislocation-defect response as a function of temperature. The vacancy-pinning effect is detectable at 195 K and reaches a maximum at 246 K. At higher temperatures, thermally assisted unpinning is observed and the dynamic effects of supersaturated vacancies are still effective at 300 K. The up-change results can determine the effective single-obstacle dislocation–dislocation strain rate sensitivity and the associated activation distance.
Keywords :
Thermally activated plastic flow , strain rate sensitivity , Dislocation-defect analysis
Journal title :
MATERIALS SCIENCE & ENGINEERING: A
Serial Year :
2008
Journal title :
MATERIALS SCIENCE & ENGINEERING: A
Record number :
2155177
Link To Document :
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