Effect of phase interactions on crystal stress evolution over crystal orientation space under elastoplastic deformation of two-phase polycrystalline solids |
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| Affiliation: | 1. Department of Civil and Environmental Engineering, Yonsei University, 50 Yonsei-ro, Seodamun-gu, Seoul 120-749, Republic of Korea;2. Department of Mechanical Engineering, UNIST, 50 UNIST-gil, Ulsan 689-798, Republic of Korea;1. Institute of Civil Engineering, Ecole Polytechnique Fédérale of Lausanne (EPFL), Lausanne, Switzerland;2. Materials Science Institute, Ecole Polytechnique Fédérale of Lausanne (EPFL), Lausanne, Switzerland;1. Stiftung Institut für Werkstofftechnik (IWT), Bremen, Germany;2. CONICET and University of Buenos Aires, Argentina;1. State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, People’s Republic of China;2. College of Chemical Engineering, China University of Mining and Technology, Xuzhou 221008, People’s Republic of China;3. Department of Chemistry, Hong Kong Baptist University and Centre for Advanced Luminescence Materials, Waterloo Road, Kowloon Tong, Hong Kong;4. Low Carbon Energy Institute, China University of Mining and Technology, Xuzhou 221008, People’s Republic of China;5. MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter and Department of Chemistry, Faculty of Science, Xi’an Jiao Tong University, Xi’an 710049, People’s Republic of China;6. Faculty of Chemistry & Chemical Engineering, Hainan Normal University, Haikou 571158, People’s Republic of China;1. Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, China;2. CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology, Nuclear Power Institute of China, Chengdu 610041, China |
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| Abstract: | It has been known for decades that crystal stress directions move toward the vertices of the single crystal yield surface (SCYS) during plastic flow of polycrystalline solids to satisfy the deformation compatibility among crystals. The alignment of crystal stress with a SCYS vertex is affected not only by plastic anisotropy, but also by other factors such as elastic anisotropy, loading direction, and grain interactions. Among the factors contributing to the degree of alignment, the effect of phase interactions on the crystal stress evolution during plastic flow has not been extensively investigated. In this research, the effect of phase interactions on the crystal stress direction evolution is investigated using simulations of an elastoplastically deforming two-phase (Cu/Fe) polycrystalline solid calibrated to a neutron diffraction experiment. By mapping the simulated crystal stresses over the crystal orientation space, crystal-orientation-dependent nonuniform partitioning of the crystal stress between phases can be observed. An analysis of the distribution of angles between the SCYS vertex and the crystal stress based on the simulation of the two-phase material shows that the crystal stress evolution pattern during plastic flow is strongly affected by phase interactions. These interactions result in low alignment and greater dispersion angles between the crystal stresses and SCYS vertices, particularly in the strong phase. |
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| Keywords: | Crystal stress Two-phase Polycrystalline solid Phase interaction Single crystal yield surface Finite element analysis Elasticity Plasticity |
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