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X-Ray Analysis of Fatigue Softening in Cold Worked Copper

Published online by Cambridge University Press:  06 March 2019

Roy G. Baggerly  and
Regis M. N. Pelloux
Roy G. Baggerly
Affiliation:
The Boeing Co., Materials Research Unit, Commercial Airplane Division, Seattle, Washington (Now at Univ. of Washington, Seattle, Washington)
Regis M. N. Pelloux
Affiliation:
The Boeing Co., Solid State Physics Laboratory, Boeing Scientific Research Laboratories, Seattle, Washington
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Abstract

The recovery and recrystallization of cold rolled copper during reverse bending fatigue at room temperature has been studied with x-ray diffraction, optical microscopy and transmission electron microscopy techniques. Recovery of x-ray line breadth was recorded as a function of number of cycles at all strain amplitudes investigated. Recrystallization was observed to take place only at small strain amplitudes (life of 106 to 107 cycles). The rate of nucleation of the recrystallized grains increases with increasing strain amplitude and is a linear function of the number of cycles. The formation and growth of the grains was confined to regions near the surface of the specimen. Since comparable thermal recovery occurs at approximately 435°F it is concluded that the dynamic generation and migration of numerous point defects during fatigue is responsible for the room temperature recrystallization.

Type
Research Article
Information
Advances in X-Ray Analysis , Volume 12: Seventeenth Annual Conference on Applications of X-ray Analysis, August 21-23, 1968 , 1968 , pp. 236 - 248
Copyright
Copyright © International Centre for Diffraction Data 1968

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