Effects of pores on shear bands in metallic glasses: A molecular dynamics study |
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| Affiliation: | 1. Centre for Material and Fibre Innovation, Deakin University, Waurn Ponds, VIC 3217, Australia;2. Key Lab for Liquid Structure and Heredity of Materials of Ministry of Education, Shandong University, Jinan 250061, China;3. Department of Mechanical and Aerospace Engineering, Monash University, Clayton, VIC 3800, Australia;4. School of Engineering, Deakin University, Waurn Ponds, VIC 3217, Australia;1. Herbert Gleiter Institute of Nano Science, School of Materials Science and Engineering, Nanjing University of Science and Technology, 200 Xiaolingwei Avenue, Nanjing 210094, PR China;2. School of Materials Science and Engineering, Nanjing University of Science and Technology, 200 Xiaolingwei Avenue, Nanjing 210094, PR China;1. Laboratoire de Mécanique de Sousse (LMS), ENISo, Technopole de Sousse, University of Sousse, Tunisia;2. Al Imam Mohammad Ibn Saud Islamic University (IMSIU), Othman Ibn Affan Street, P.O. Box 5701, Riyadh 11432, Saudi Arabia;1. Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, A-8700, Leoben, Austria;2. Laboratory for Microstructures, Institute of Materials, Shanghai University, Shanghai, 200444, China;3. Department Materials Physics, Montanuniversität Leoben, Jahnstraße 12, A-8700, Leoben, Austria;1. Science and Technology Division, Corning Incorporated, Corning, NY 14831, USA;2. Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA |
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| Abstract: | The effects of nanoscale pores on the strength and ductility of porous Cu46Zr54 metallic glasses during nanoindentation and uniaxial compression tests are modelled and investigated using molecular dynamics (MD) simulations. In the MD simulations, atomistic amorphous samples were digitally prepared through fast quenching from the liquid states of copper and zirconium alloy. In both of the nanoindentation and uniaxial compression simulations, shear transformation zones and shear bands are observed through the local deviatoric shear strains in the samples. The results show that the existence of pores causes strain concentrations and greatly promotes the initialization and propagation of shear bands. Importantly, only pores reaching critical size can effectively facilitate the formation of multiple shear bands. It is also observed that hardening occurs through pore annihilation and the shear band stops in porous metallic glasses. |
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