[논문]Viscoplastic lattice strain during repeated relaxation of age-hardened Al alloy

Lee, Hyongjoon; Chae, Hobyung; Kim, You Sub; Song, Min Ji; Lim, Sangyeob; Prasad, Kali; Krishnaswamy, Hariharan; Jain, Jayant; An, Ke; Lee, Soo Yeol

doi:10.1016/j.mechmat.2021.103899

[해외논문] Viscoplastic lattice strain during repeated relaxation of age-hardened Al alloy 원문보기

Mechanics of materials : an international journal, v.158, 2021년, pp.103899 -

Lee, Hyongjoon (Department of Materials Science and Engineering, Chungnam National University) , Chae, Hobyung (Department of Materials Science and Engineering, Chungnam National University) , Kim, You Sub (Department of Materials Science and Engineering, Chungnam National University) , Song, Min Ji (Department of Materials Science and Engineering, Chungnam National University) , Lim, Sangyeob (Korea Atomic Energy Research Institute) , Prasad, Kali (Department of Mechanical Engineering, Indian Institute of Technology Madras) , Krishnaswamy, Hariharan (Department of Mechanical Engineering, Indian Institute of Technology Madras) , Jain, Jayant (Department of Materials Science and Engineering, Indian Institute of Technology Delhi) , An, Ke (Spallation Neutron Source, Oak Ridge National Laboratory) , Lee, Soo Yeol (Department of Materials Science and Enginee)

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Abstract We examined the repetitive stress relaxation behavior of extruded AA7075 subjected to different heat-treatments (solid-solutionized (SS), under-aged (UA), peak-aged (PA)). Compared to SS and UA, the PA showed the highest stress drop (Δσ s ), plastic strain change (Δε p ) and re-yielding (Δσ r ), in conjunction with the largest reduction in mobile dislocation density right after stress relaxation. As stress relaxation cycles repeated, the stress drop decreased due to lower activities of mobile dislocations. During stress relaxation, the harder the grain orientation was, the more was the reduction in lattice strain. However, this tendency was not consistent with the order in the magnitude of the shear stresses imposed on the respective grains based on Schmid's law. The current results confirm the grain-orientation dependency on the relative activities of dislocation slip and diffusion-controlled creep during the stress relaxation at room temperature. Highlights Repetitive stress-relaxation tests of extruded AA7075 subjected to different heat-treatments at room temperature. Macro- and micro-analyses were conducted by calculating plastic flow parameters and using in-situ neutron diffraction. The peak-aged sample showed the greatest decrease in mobile dislocation density during stress relaxation. The harder the grain orientation was, the more was the reduction in lattice strain. Grain orientation dependency on the activities of dislocation slip and diffusion-controlled creep during relaxation. Graphical abstract [DISPLAY OMISSION]

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[해외논문] Viscoplastic lattice strain during repeated relaxation of age-hardened Al alloy 원문보기

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[해외논문] Viscoplastic lattice strain during repeated relaxation of age-hardened Al alloy 원문보기

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