Dislocation Kink-Pair Energetics and Pencil Glide in Body-Centered-Cubic Crystals
Open Access
- 31 July 2001
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 87 (7), 075505
- https://doi.org/10.1103/physrevlett.87.075505
Abstract
When body-centered-cubic crystals undergo plastic deformation, the slip planes are often noncrystallographic. By performing atomistic simulation on the activation pathway of dislocation jumps in bcc iron, we show that the main reason for bcc crystals to exhibit this phenomenon is that one type of kink pair has significantly lower energy than all the other types on the same slip plane. Dislocation motion therefore cannot continue on the same slip plane, and the dislocation has to cross slip onto an intersecting slip plane after each atomic jump. Thus in the long run, the average slip plane would be zigzag and noncrystallographic.This publication has 9 references indexed in Scilit:
- Atomistic simulation of kink-pairs of screw dislocations in body-centred cubic ironActa Materialia, 2000
- Atomistic Determination of Cross-Slip Pathway and EnergeticsPhysical Review Letters, 1997
- Reversible work transition state theory: application to dissociative adsorption of hydrogenSurface Science, 1995
- Dislocation Dynamics and PlasticityPublished by Springer Science and Business Media LLC ,1991
- Analytic embedded atom method model for bcc metalsJournal of Materials Research, 1989
- On kinked screw dislocations in the b.c.c. lattice—I. The structure and peierls stress of isolated kinksActa Metallurgica, 1983
- The effect of shear stress on the screw dislocation core structure in body-centred cubic latticesProceedings of the Royal Society of London. Series A - Mathematical and Physical Sciences, 1973
- The influence of core structure on dislocation mobilityPhilosophical Magazine, 1969
- The distortion of iron crystalsProceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character, 1926