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논문 기본 정보

자료유형
학술저널
저자정보
Yasin Alemdağ (Karadeniz Technical University) Sadun Karabiyik (Karadeniz Technical University) Gençağa Pürçek (Karadeniz Technical University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.29 No.4
발행연도
2023.4
수록면
1,181 - 1,194 (14page)
DOI
10.1007/s12540-022-01280-y

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초록· 키워드

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In this study, the microstructure and mechanical properties of severely deformed Al–12Si–3Cu–0.5Mn alloy were systematicallyinvestigated. The alloy produced by permanent mold casting was homogenized and processed with multi-directionforging (MDF) up to four cycles at 200 °C. MDF gave rise to fragmentation of hard particles, formation of dispersoids, andfine grains with high angle grain boundaries. The grain size of the alloy after one-cycle MDF decreased from 27.30 μm tosub-micron levels of about 0.5 μm. After one-cycle MDF, the formed microstructure consisted of ultrafine grains (UFG) withand without intense dislocations. Lattice microstrains and dislocation densities of the alloy decreased with increasing forgingcycles. In general, hardness, yield and tensile strength, elongation and impact toughness of the alloy increased after MDF.The highest hardness, yield and tensile strength of the alloy were obtained after the two-cycle MDF, while the four-cycleMDF produced the highest elongation and impact toughness values. Fracture surface of the tensile tested alloy before MDFconsisted of large cleavage planes and hills. However, narrow cleavage planes and plenty of dimples occurred on the tensilefracture surface of the alloy after MDF. These findings were elucidated according to microstructural alterations as a resultof fragmentation of hard particles, formation of dispersoids and fine grains, annihilation of dislocations and grain growth.

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