Author
D.J Mazey
Bio: D.J Mazey is an academic researcher. The author has contributed to research in topics: Critical resolved shear stress & Slip (materials science). The author has an hindex of 1, co-authored 1 publications receiving 45 citations.
Papers
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TL;DR: In this paper, a number of prismatic dislocation loops have been observed in thin films obtained from copper foils which have been water quenched from 1055°C. The spacing of the loops is consistent with the theory of Bullough and Newman, which enables a value of the critical resolved shear stress to be estimated.
49 citations
Cited by
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TL;DR: In this article, a new theory of work hardening in dispersion-hardened single crystals is described, which is based on the fact that, if the particles do not deform plastically, and the interface between particle and matrix does not fracture, then secondary slip must occur locally round each particle when the crystal is deformed, even though the crystal may appear to deform by single slip.
Abstract: A new theory of work hardening in dispersion-hardened single crystals—by which we mean soft crystals containing hard non-deforming particles of a second phase—is described. It is based on the fact that, if the particles do not deform plastically, and the interface between particle and matrix does not fracture, then secondary slip must occur locally round each particle when the crystal is deformed, even though the crystal may appear to deform by ‘single slip’. The density of secondary dislocations rises steeply with strain, and acts as a forest impeding the movement of primary glide dislocations. The theory predicts a relation between stress and strain (eqn. (9)) which is in good agreement with experimental results. Fracture of the particle-matrix interface, and the importance of the strength of this interface, are discussed.
528 citations
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TL;DR: In this article, the displacement damage through heavy ion irradiation was studied on two tungsten grades (coarse grained Tungsten (CGW) and nanocrystalline and ultrafine grained (NCW) using different displacement per atom rates and different irradiation temperatures (RT and 1050 K).
78 citations
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TL;DR: In this paper, the influence of concurrent phase transformation on the deformation of Armco iron and electrolytic vacuum cast (EVC) iron was studied under compressive and torsional stresses from 200 to 1085 psi.
66 citations
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TL;DR: In this article, it was shown that the annealing behavior of copper quenched from high temperature is similar to that of silver, provided that care is taken in both cases to avoid contamination by oxygen.
Abstract: It is shown, using electrical resistance measurements and transmission electron microscopy, that the annealing behaviour of copper quenched from high temperature is similar to that of silver, provided that care is taken in both cases to avoid contamination by oxygen. To achieve this, copper was quenched from an atmosphere of carbon monoxide. The results obtained under these conditions suggest that the divacancy is the principal defect retained in copper after quenching from high temperatures. The temperatures at which stacking-fault tetrahedra anneal out in silver and gold were studied by transmission microscopy. In silver, tetrahedra are stable up to at least 930°c. The stability of tetrahedra in gold depends on their size, being greater the larger the tetrahedra. Finally it has been shown that dislocation loops, not tetrahedra, predominate as the clustered vacancy defect in gold if, after quenching from high temperature to 0°c, the gold is rapidly upquenched to 100°c.
60 citations
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TL;DR: In this article, the long-range elastic interactions between dislocations and loops, both prismatic and shear, have been calculated for an isotropic medium, from the energy of interaction.
Abstract: The long-range elastic interactions between dislocations and loops, both prismatic and shear, have been calculated for an isotropic medium. From the energy of interaction the magnitude and directio...
52 citations