Dislocation arrangements in aluminum deformed by repeated tensile stresses
Feltner, Charles E.
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https://hdl.handle.net/2142/111954
Description
Title
Dislocation arrangements in aluminum deformed by repeated tensile stresses
Author(s)
Feltner, Charles E.
Issue Date
1962-11
Keyword(s)
Dislocation
Aluminum
Stress
Abstract
Transmission electron microscopy is used to study the dislocation arrangements formed in aluminum at 78° and 300°K by the action of repeated tensile stresses. Although a pronounced macroscopic cyclic stress induced creep effect is observed, the dislocation pattern formed on the first cycle at 78°K is not grossly altered by the subsequent cycling. The dislocation density and cell size undergo a slight increase and decrease, respectively. Contrary to published results on the fatigue of aluminum under reversed stresses, the dislocation loop density in aluminum deformed by a repeated tensile stress is not significantly larger than the loop density produced by unidirectional straining.
The present information and additional results on the effect of cyclic straining on the low yield temperature phenomenon in FCC metals support a mechanism based on point deflect-dislocation interaction as a satisfactory explanation for cyclic stress induced creep.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
TAM R 236
1967-0532
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/111954
Sponsor(s)/Grant Number(s)
Aeronautical Systems Division, Wright-Patterson Air Force Base, Contract No. AF 33(616)-8177
Copyright and License Information
Copyright 1962 Board of Trustees of the University of Illinois
TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.
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