Effect of void size and Mg contents on plastic deformation behaviors of Al-Mg alloy with pre-existing void: Molecular dynamics study
Ning Wei(魏宁)1, Ai-Qiang Shi(史爱强)1, Zhi-Hui Li(李志辉)2,3,†, Bing-Xian Ou(区炳显)4, Si-Han Zhao(赵思涵)1, and Jun-Hua Zhao(赵军华)1,‡
1 Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology, Jiangnan University, Wuxi 214122, China; 2 China Aerodynamics Research and Development Center, Mianyang 621000, China; 3 National Laboratory for Computational Fluid Dynamics, Beijing 100191, China; 4 National Graphene Products Quality Supervision and Inspection Center, Special Equipment Safety Supervision Inspection Institute of Jiangsu Province, Wuxi 214174, China
Abstract The plastic deformation properties of cylindrical pre-void aluminum-magnesium (Al-Mg) alloy under uniaxial tension are explored using molecular dynamics simulations with embedded atom method (EAM) potential. The factors of Mg content, void size, and temperature are considered. The results show that the void fraction decreases with increasing Mg in the plastic deformation, and it is almost independent of Mg content when Mg is beyond 5%. Both Mg contents and stacking faults around the void affect the void growth. These phenomena are explained by the dislocation density of the sample and stacking faults distribution around the void. The variation trends of yield stress caused by void size are in good agreement with the Lubarda model. Moreover, temperature effects are explored, the yield stress and Young's modulus obviously decrease with temperature. Our results may enrich and facilitate the understanding of the plastic mechanism of Al-Mg with defects or other alloys.
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11502217), the Fundamental Research Funds for the Central Universities (Grant Nos. 2452015054, 2452017122, and JUSRP121042), the China Postdoctoral Science Foundation (Grant Nos. 2015M570854 and 2016T90949), the Projects of the Manned Space Engineering Technology (Grant No. 2020-ZKZX-5011), Development of Large-Scale Spacecraft Flight and Reentry Surveillance and Prediction System, the Open Fund of Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education (NUAA) (Grant No. INMD-2019M08), and Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology (Grant Nos. FMZ202001 and FMZ202009).
Ning Wei(魏宁), Ai-Qiang Shi(史爱强), Zhi-Hui Li(李志辉), Bing-Xian Ou(区炳显), Si-Han Zhao(赵思涵), and Jun-Hua Zhao(赵军华) Effect of void size and Mg contents on plastic deformation behaviors of Al-Mg alloy with pre-existing void: Molecular dynamics study 2022 Chin. Phys. B 31 066203
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