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Strain Rate Sensitivities of Face-Centred-Cubic Metals Using Molecular Dynamics Simulation |
| QIN Kun1,2, YANG Li-Ming2, HU Shi-Sheng1 |
| 1CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 2300272Mechanics and Materials Science Research Centre, Faculty of Engineering, Ningbo University, Ningbo 315211 |
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| Cite this article: |
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QIN Kun, YANG Li-Ming, HU Shi-Sheng 2008 Chin. Phys. Lett. 25 2581-2584 |
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Abstract We use dislocation theory and molecular dynamics (MD) simulations to investigate the effect of atom properties on the macroscopic strain rate sensitivity of fcc metals. A method to analyse such effect is proposed. The stress dependence of dislocation velocity is identified as the key of such study and is obtained via 2-D MD simulations on the motion of an individual dislocation in an fcc metal. Combining the simulation results with Orowan's relationship, it is concluded that strain rate sensitivities of fcc metals are mainly dependent on their atomic mass rather than the interatomic potential. The order of strain rate sensitivities of five fcc metals obtained by analysing is consistent with the experimental results available.
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61.72.Bb
61.50.Ah
62.20.Fq
62.20.-x
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Received: 12 March 2008
Published: 26 June 2008
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| PACS: |
61.72.Bb
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(Theories and models of crystal defects)
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61.50.Ah
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(Theory of crystal structure, crystal symmetry; calculations and modeling)
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62.20.fq
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(Plasticity and superplasticity)
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62.20.-x
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(Mechanical properties of solids)
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