Atomic modelling of strengthening mechanisms due to voids and copper precipitates in α-iron
- 1 October 2003
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine
- Vol. 83 (31-34) , 3623-3641
- https://doi.org/10.1080/14786430310001603364
Abstract
Recently a model has been developed by Osetsky and Bacon to study edge dislocations moving over large distances on the atomic scale. It permits investigation of motion of a dislocation under different conditions of applied shear stress with constant or variable strain rate and temperature, and in the presence of obstacles. In this paper we apply the model to study the motion of an infinite straight but flexible edge dislocation through a row of either voids or coherent copper precipitates in bcc iron. Stress–strain curves, energy barrier profile and strength characteristics of obstacles and other dislocation configuration information have been obtained from the modelling and compared with continuum treatments. Some specific atomic-scale mechanisms associated with strengthening due to voids and precipitates over a range of size have been observed and discussed.Keywords
This publication has 19 references indexed in Scilit:
- Computer simulation of the core structure of the screw dislocation in α-iron containing copper precipitates:: I. structure in the matrix and a precipitateActa Materialia, 2002
- The peak- and overaged states of particle strengthened materials: computer simulationsActa Materialia, 2001
- Atomistic Simulations of Interactions between Cu Precipitates and an Edge Dislocation in a B.C.C. Fe Single CrystalPhysica Status Solidi (b), 2000
- Atomic scale modelling of edge dislocation movement in the alpha-Fe-Cu systemModelling and Simulation in Materials Science and Engineering, 2000
- Study of defect annealing behaviour in neutron irradiated Cu and Fe using positron annihilation and electrical conductivityJournal of Nuclear Materials, 2000
- Computer simulation of point defect properties in dilute Fe—Cu alloy using a many-body interatomic potentialPhilosophical Magazine A, 1997
- Microstructural developments in neutron-irradiated mild steel submerged-arc weld metalJournal of Nuclear Materials, 1993
- SimpleN-body potentials for the noble metals and nickelPhilosophical Magazine A, 1987
- A TEM study of neutron-irradiated ironJournal of Nuclear Materials, 1982
- The effect of dislocation self-interaction on the orowan stressPhilosophical Magazine, 1973