Strain rate dependence of tension and compression behavior in nano-polycrystalline vanadium nitride |
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| Affiliation: | 1. College of Aerospace Engineering, Chongqing University, Chongqing 400044, China;2. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China;3. International Iberian Nanotechnology Laboratory (INL), Avenida Mestre Jose Veiga, Braga 4715-330, Portugal;1. International Center for New-Structured Materials (ICNSM), Laboratory of New-Structured Materials, State Key Laboratory of Silicon Materials, and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, PR China;2. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada;3. State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, PR China;4. Hangzhou Workers Amateur University, Hangzhou 310027, PR China;5. Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996, USA;1. Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123, USA;2. Department of Mechanical & Materials Engineering, University of Nebraska-Lincoln, NE 68588, USA;3. Department of Materials Science and Engineering, China University of Petroleum-Beijing, Beijing 102249, China;4. Department of Electrical & Computer Engineering, Texas A&M University, College Station, TX 77843-3128, USA;5. School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA;6. School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA;1. College of Aerospace Engineering, Chongqing University, Chongqing 400044, China;2. Chongqing Key Laboratory of Heterogeneous Materials Mechanics, Chongqing University, Chongqing 400044, China;3. Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan;1. College of Aerospace Engineering, Chongqing University, Chongqing 400044, China;2. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China;3. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;4. Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan;1. Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Kowloon, Hong Kong SAR, China;2. Key Laboratory of Low Dimensional Materials and Application Technology, Ministry of Education, Xiangtan University, Hunan 411105, China;3. Department of Mechanical Engineering, Curtin University, Perth, WA 6845, Australia |
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| Abstract: | We performed molecular dynamics (MD) uniaxial tension and compression simulations of nano-polycrystalline (npc) vanadium nitride (VN) with different strain rates to investigate strain rate effects and tension-compression asymmetry in npc VN. The Zener's familiar anisotropy index A of the polycrystalline VN model is 0.957, very closed to 1.0, demonstrating its elastic isotropy. The Young's modulus increases with the increase of strain rate. The yield strain, yield stress and flow stress increase in power form with the increase of strain rate. As the strain rate varies in the range between 5E8 and 1E9 s−1, strain rate effect becomes insignificant, and the corresponding loading can be regarded as quasistatic or low strain rate loading. Tension-compression asymmetry was observed and analyzed systematically. The elastic tension-compression asymmetry should be ascribed to the higher friction in compression, the asymmetry of interatomic potential, and the effect of cutoff distance in a MD simulation. While the plastic tension-compression asymmetry should mainly result from the different kinds of atomic interaction, intergranular fracture and dislocation glide. No distinct grain boundary sliding was found. |
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| Keywords: | Nano-polycrystalline VN Strain rate Tension-compression asymmetry Molecular dynamics simulation |
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