期刊
ACTA MATERIALIA
卷 228, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2022.117764
关键词
Shape memory alloy; Molecular dynamics; Interatomic potential; Nanowire; Quasi-linear elasticity
资金
- European Research Council (ERC) under the European Union [865855]
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT [NRF-2019M3D1A1079214, NRF-2019M3E6A1103984, NRF-2019R1F1A1040393]
- Stuttgart Center for Simulation Science (SimTech)
- National Supercomputing Center [KSC-2020-CRE-0332]
- European Research Council (ERC) [865855] Funding Source: European Research Council (ERC)
The influence of pre-strain and temperature on the superior properties exhibited by an Nb nanowire embedded in a NiTi shape memory alloy is investigated using molecular dynamics simulations. Plastic deformation in the embedded Nb nanowires is found to play a crucial role in the observed phenomena of quasi-linear elasticity, slim hysteresis, and reduction in Young's modulus. A descriptor correlating Young's modulus evolution during pre-straining is proposed, and simulations suggest that the desired Young's modulus can be achieved through appropriate pre-straining for a wide range of application temperatures.
The influence of pre-strain and temperature on the superior properties exhibited by an Nb nanowire em-bedded in a NiTi shape memory alloy (SMA) are investigated via molecular dynamics simulations. To this end, a new Nb-Ni-Ti ternary interatomic potential based on the second nearest-neighbor modified embedded-atom method (2NN MEAM) is developed and employed. The origin of the unique phenom-ena of quasi-linear elasticity, slim hysteresis, and reduction in Young's modulus observed for pre-strained nanowire-SMA composites is uncovered. The results demonstrate the importance of plastic deformation in the embedded Nb nanowires and reveal how the deformation facilitates the just-mentioned, unprece-dented phenomena. A simple and straightforwardly obtainable descriptor to correlate and monitor the Young's modulus evolution during pre-straining is proposed. Furthermore, our simulations suggest that the desired Young's modulus can be obtained for a wide range of application temperatures through ap-propriate pre-straining. (c) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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