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논문 기본 정보

자료유형
학술저널
저자정보
Dong Hee Lee (Kyungpook National University) Sang‑Hoon Kim (Kyungpook National University) Hyun Ji Kim (Kyungpook National University) Byoung Gi Moon (Korea Institute of Materials Science) Young Min Kim (Korea Institute of Materials Science) Sung Hyuk Park (Kyungpook National University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.3
발행연도
2021.1
수록면
530 - 537 (8page)

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The effects of extrusion speed on the microstructure and tensile properties of a recently developed Mg–9Al–0.8Zn–0.9Ca–0.6Y–0.5MM (AZXWMM91100) alloy are investigated by extruding at various ram speeds of 1, 4, 7, 10, and 13 mm/s. Direct extrusion results reveal that numerous small edge cracks form in the sheets extruded at ram speeds between 4 and10 mm/s, whereas severe hot cracking occurs during extrusion at 13 mm/s. All extruded sheets show a fully recrystallizedgrain structure containing second-phase particles aligned along the extrusion direction. The average size of the recrystallizedgrains gradually increases with the increasing ram speed, because a higher extrusion speed generates more deformation heat. However, the size, morphology, amount, and distribution of the second-phase particles are nearly identical in all the extrudedsheets. As the ram speed increases from 1 to 10 mm/s, the tensile yield strength of the extruded material decreases from 205to 125 MPa, which is attributed to the decrease in the grain-boundary hardening effect caused by the grain coarsening. Thetensile elongation increases from 13.0% at 1 mm/s to 15.1% at 4 mm/s, and then greatly decreases to 2.9% at 10 mm/s. Thedrastic ductility degradation of the sheets extruded at the ram speeds larger than 7 mm/s is due to the formation of relativelycoarse internal cracks in the material during extrusion.

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