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Article

The Effect of Strain Rate on the Deformation Processes of NC Gold with Small Grain Size

1
Key Laboratory of Automobile Materials, Ministry of Education, and College of Materials Science and Engineering, Jilin University, Changchun 130012, China
2
Department of Material Science and Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
3
Department of Physics and Astronomy, University of Missouri, Columbia, MO 65211-7010, USA
4
State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130012, China
*
Author to whom correspondence should be addressed.
Crystals 2020, 10(10), 858; https://doi.org/10.3390/cryst10100858
Received: 13 August 2020 / Revised: 13 September 2020 / Accepted: 17 September 2020 / Published: 24 September 2020
(This article belongs to the Special Issue Crystal Plasticity at Micro- and Nano-scale Dimensions)
The strength of nanocrystalline (NC) metal has been found to be sensitive to strain rate. Here, by molecular dynamics simulation, we explore the strain rate effects on apparent Young’s modulus, flow stress and grain growth of NC gold with small size. The simulation results indicate that the apparent Young’s modulus of NC gold decreases with the decrease of strain rate, especially for strain rates above 1 ns−1. The rearrangement of atoms near grain boundaries is a response to the decrease of apparent Young’s modulus. Indeed, the flow stress is also sensitive to the strain rate and decreases following the strain rate’s decrease. This can be found from the change of strain rate sensitivity and activation volume with the strain rate. Temperature has little effect on the activation volume of NC gold with small grain size, but has an obvious effect on that of relatively large grain size (such as 18 nm) under low strain rate (0.01 ns−1). Finally, grain growth in the deformation process is found to be sensitive to strain rate and the critical size for grain growth increases following the decrease of strain rate. View Full-Text
Keywords: strain rate; molecular dynamics simulation; strain rate sensitivity; activation volume; grain growth strain rate; molecular dynamics simulation; strain rate sensitivity; activation volume; grain growth
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MDPI and ACS Style

Liu, J.; Fan, X.; Shi, Y.; Singh, D.J.; Zheng, W. The Effect of Strain Rate on the Deformation Processes of NC Gold with Small Grain Size. Crystals 2020, 10, 858. https://doi.org/10.3390/cryst10100858

AMA Style

Liu J, Fan X, Shi Y, Singh DJ, Zheng W. The Effect of Strain Rate on the Deformation Processes of NC Gold with Small Grain Size. Crystals. 2020; 10(10):858. https://doi.org/10.3390/cryst10100858

Chicago/Turabian Style

Liu, Jialin, Xiaofeng Fan, Yunfeng Shi, David J. Singh, and Weitao Zheng. 2020. "The Effect of Strain Rate on the Deformation Processes of NC Gold with Small Grain Size" Crystals 10, no. 10: 858. https://doi.org/10.3390/cryst10100858

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