Effects of accommodated grain boundary sliding on triple junction nanovoid nucleation in nanocrystalline materials |
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| Affiliation: | 1. Department of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing, Jiangsu 210009, China;2. Department of Mechanical Engineering, Wuhan Institute of Technology, Wuhan, Hubei 430070, China;3. School of Energy and Power Engineering, North China Electric Power University, Baoding, Hebei 071003, China;1. Department of Biosystems and Agricultural Engineering, Michigan State University, East Lansing, MI 48824, USA;2. Environmental Management and Byproduct Utilization Laboratory, USDA, Beltsville, MD 20705, USA;1. CEAS, The Mill, University of Manchester, Oxford Road, Manchester M13 9PL, UK;2. Department of Chemical & Biomolecular Engineering, University of Melbourne, Parkville VIC 3010, Australia;1. Department of Materials Science and Engineering EEBE, Universidad Politécnica de Catalunya, C/Eduard Maristany 10-14, 08019 Barcelona, Spain;2. Instituto de Física Rosario, Consejo Nacional de Investigaciones Científicas y Técnicas-CONICET, Ocampo y Esmeralda, 2000 Rosario, Argentina;1. College of Materials Science and Engineering, Chongqing University, Chongqing, China;2. State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing, China;3. School of Mechatronics Engineering, East China Jiaotong University, Nanchang, China;1. The University of Tokyo, Japan;2. Osaka University, Japan |
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| Abstract: | A theoretical model is suggested to investigate the effect of grain boundary (GB) sliding with GB diffusion accommodation on triple junction nanovoids nucleation in deformed nanocrystalline materials. Within our description, at high strain rate, nanovoids are nucleated due to GB sliding which is non-accommodated at comparatively low temperature and effectively accommodated by GB diffusion process at elevated temperature. In this paper, the corresponding energy characteristics of the pile-up of GB dislocations caused by GB sliding and GB diffusion are calculated, respectively. Then, the nucleation of nanovoid at triple junctions is studied and the equilibrium radius of nanovoid is obtained. Calculation results show that: the nucleation and the equilibrium radius of the triple junction nanovoid both depend significantly on the shear stress, the length of the pile-up and the GB structures; the accommodated GB sliding results in the suppression of nanovoid generation, and thereby promotes the ductility deformation behavior in a nanocrystalline material. |
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| Keywords: | Void nucleation Nanocrystalline materials Dislocations Grain boundaries |
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