ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
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 $$\dot \in $$ /∂τ*) T where k is Boltzmann's constant, T the absolute temperature, b the Burgers vector, $$\dot \in $$ the steady state creep rate, and τ * 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00550006
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