 | | Mechanics of Solids
A Journal of Russian Academy of Sciences | | Founded
in January 1966
Issued 6 times a year
Print ISSN 0025-6544
Online ISSN 1934-7936 |
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| In English (Mech. Solids): | | 4810 |
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| A.Yu. Kuksin and A.V. Yanilkin, "Dislocation Nucleation and Motion in Metals and Alloys at High-Rate Deformation: Molecular Dynamic Simulation," Mech. Solids. 50 (1), 44-51 (2015) |
| Year |
2015 |
Volume |
50 |
Number |
1 |
Pages |
44-51 |
| DOI |
10.3103/S0025654415010057 |
| Title |
Dislocation Nucleation and Motion in Metals and Alloys at High-Rate Deformation: Molecular Dynamic Simulation |
| Author(s) |
A.Yu. Kuksin (Joint Institute for High Temperatures, Russian Academy of Sciences, ul. Izhorskaya 13-2, Moscow, 125412 Russia; Moscow Institute of Physics and Technology (State University), Institutskii per. 9, Dolgoprudny, Moscow Region, 141700 Russia, alexey.kuksin@gmail.com)
A.V. Yanilkin (Joint Institute for High Temperatures, Russian Academy of Sciences, ul. Izhorskaya 13-2, Moscow, 125412 Russia; Moscow Institute of Physics and Technology (State University), Institutskii per. 9, Dolgoprudny, Moscow Region, 141700 Russia) |
| Abstract |
Molecular dynamic simulation was used to calculate the critical stresses necessary for dislocations to nucleate and move in the dynamic friction mode and determine the coefficients of dislocation phonon friction in metals with point defects and Guinier-Preston (GP) zones (in the Al-Cu alloy) taken into account. The temperature dependencies of the critical stresses required to overcome the GP zones in Al at different speeds of dislocation motion were analyzed to distinguish the thermofluctuation and dynamic (weakly depending on T) contributions to the yield strength at high-rate deformations. It was noted that the dislocation nucleation stresses strongly decrease with increasing temperature in the defect-free case and the stresses of dislocation heterogeneous nucleation on GP clusters remain nearly unchanged. |
| Keywords |
dislocations, Guinier-Preston clusters, phonon friction, high-rate deformation, molecular dynamics |
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|
| Received |
17 July 2014 |
| Link to Fulltext |
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