On the generation of dislocations at misfitting particles in a ductile matrix
- 1 November 1969
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine
- Vol. 20 (167) , 1009-1022
- https://doi.org/10.1080/14786436908228069
Abstract
The nucleation of a shear dislocation loop from the interface of a misfitting spherical particle in a deformable matrix is considered. The equilibrium shapes and positions of the nucleated dislocation have been calculated. There are two critical levels of misfit. The lower critical level, which is dependent on the particle size, must be reached before nucleation can occur. Above the upper critical level, which is virtually independent of the particle size, nucleation will always occur. Experimental measurements of the critical misfit show that the upper critical level describes the spontaneous generation of dislocations at coherent particles, whereas the lower level describes their generation at incoherent particles. Possible reasons for this are discussed.Keywords
This publication has 10 references indexed in Scilit:
- The stress at which dislocations are generated at a particle-matrix interfacePhilosophical Magazine, 1969
- Observations of Dislocation Sources in an Aluminium-Copper-Silicon AlloyPhilosophical Magazine, 1968
- Loss of coherency of growing particles by the prismatic punching of dislocation loopsPhilosophical Magazine, 1968
- Radiation-induced coherency loss in a Cu–Co alloyPhilosophical Magazine, 1968
- Nucleation of Dislocations around Inclusions in Iron CrystalsTransactions of the Japan Institute of Metals, 1968
- A Determination of the Punching Stress at the Interface of Particles during Rapid QuenchingMetal Science Journal, 1968
- The self-stress of dislocations and the shape of extended nodesPhilosophical Magazine, 1964
- The energy and line tension of a dislocation in a hexagonal crystalJournal of the Mechanics and Physics of Solids, 1962
- The determination of the elastic field of an ellipsoidal inclusion, and related problemsProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1957
- An attempt to estimate the degree of precipitation hardening, with a simple modelProceedings of the Physical Society, 1940