Journal
INTERNATIONAL JOURNAL OF PLASTICITY
Volume 155, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2022.103317
Keywords
CuFe alloys; Nano-precipitates; Dislocations; MD simulations
Funding
- National Key R&D Program of China [2021YFB3400800]
- National Natural Science Foundation of China [51901177]
- China Postdoctoral Science Foundation [2019M653596]
- Natural Science Foundation of Shaanxi Province [2021JC-06, 2019TD-020]
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Molecular dynamics simulations were used to study the interaction mechanisms between dislocations and nano-precipitates in CuFe alloys. The simulations revealed that nano-precipitates can both promote twinning deformation and dislocation gliding away from themselves, as well as prevent dislocations from moving towards them. A hybrid model was developed to demonstrate the strengthening effects of nano-precipitates, with an optimized size obtained.
Molecular dynamics (MD) simulations are employed to study the interaction mechanisms between dislocations and nano-precipitates in CuFe alloys. On one hand, the critical shear stress to activate nucleation of dislocations around alpha-Fe nano-precipitates is substantially reduced, which promotes twinning deformation and dislocation gliding away from the nano-precipitates. On the other hand, nano-precipitates could also prevent dislocations from moving towards themselves. A hybrid model is developed to demonstrate the strengthening behaviors with an enhancing efficiency factor (beta) introduced. Large alpha-Fe nano-precipitates lead to high strengthening efficiency, but an optimized size is obtained owing to the softening effect of large nano-precipitates. Moreover, the strengthening effects of nano-precipitates will disappear if the loading speed exceeds a critical value.
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