The activation areas for creep deformation |
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| Authors: | N. Balasubramanian J. C. M. Li |
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| Affiliation: | (1) Henry Krumb School of Mines, Columbia University, New York, USA;(2) E. C. Bain Laboratory for Fundamental Research, US Steel Corporation, Monroeville, Pennsylvania, USA;(3) Present address: Materials Research Centre, Allied Chemical Corporation, Morristown, New Jersey, USA |
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| Abstract: | The activation areas for creep deformation are collected and examined in the light of many material and deformation variables. The activation area is A*= (kT/b) ( In  / *)T where k is Boltzmann's constant, T the absolute temperature, b the Burgers vector,  the steady state creep rate, and * the effective shear stress. It is found that within a factor of 5, there is a general correlation between activation area and stress for all metals, alloys, semiconductors and ionic crystals. A jog-limited dislocation motion with a distribution of jog spacings is suggested as a possible mechanism for this behaviour. Some limitations for the jog mechanism are discussed. |
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