The binding energy of oxygen to a dislocation in tantalum
- 1 January 1966
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine
- Vol. 13 (121), 41-52
- https://doi.org/10.1080/14786436608211986
Abstract
The binding energy between an oxygen atom and a dislocation in tantalum has been determined experimentally by measuring the critical temperature, T c, a t which the discontinuous yield disappears on heating. Assuming that T c is the temperature at which the atmosphere is boiled off and estimating the saturation concentration, C s, of oxygen at a dislocation from the analysis of Cochardt, Schoek and Wiedersich, using a value for the lattice distortion surrounding an oxygen atom deduced from x-ray measurements, the binding energy V B is found from where C 0, is the concentration of oxygen at a large distance from the dislocation. As an example of the use to which a knowledge of the binding energy can be put, the theoretical shear strength of tantalum is estimated to be G/9·8 (G is the shear modulus) by a method which does not require the assumption of a specific law of interatomic forces.Keywords
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