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ON THE NATURE OF STRAIN HARDENING IN FACE-CENTERED-CUBIC METALS
MATERIALS RESEARCH LAB UNIV OF CALIF BERKELEY
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The low temperature tensile and creep behaviors of single crystals of Cu were evaluated and analyzed in such a manner as to provide an estimate of the separate contributions of short and long range stress fields to strain-hardening. Furthermore, the average force-displacement diagram for thermally activated intersection of two dislocations was established. This diagram plus a knowledge of the variation of dislocation spacing and the long-range back stresses with strain permits an accurate prediction of creep rates. The calculated activation energy for intersection under conditions of a constant strain rate increases linearly with the absolute temperature as required by theory. Author
APPROVED FOR PUBLIC RELEASE