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논문 기본 정보

자료유형
학술저널
저자정보
MinYoung Song (Korea Institute of Industrial Technology (KITECH)) InSu Kim (Korea Institute of Industrial Technology (KITECH)) JaeHwang Kim (Korea Institute of Industrial Technology (KITECH)) SungKil Hong (Chonnam National University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.6
발행연도
2021.1
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1,374 - 1,381 (8page)

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초록· 키워드

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The effect of Cu contents on nanocluster formation and the two-step aging behavior of Al–Mg–Si alloys was studied based onhardness, DSC and TEM results. The activation energies for the formation of Cluster (1) were 61.6, 70.3 and 92.9 kJ/mol forCu-free, 1Cu (0.1 mass% Cu-added) and 3Cu (0.3 mass% Cu-added), respectively. It was confirmed that hardness increasedslowly with increasing Cu content during natural aging for 3.6 ks. These results suggest that the formation kinetics of Cluster(1) decrease due to the vacancy trapping phenomenon, because of the strong interactions of the Cu-vacancies. Meanwhile,the effect of the formation of nanoclusters by Cu addition on the two-step aging behavior at 170 °C during natural aging wasanalyzed. Hardness at the initial stage of the two-step aging increased with increasing Cu contents. This was caused by thesuppression of Cluster (1) formation during natural aging by the Cu additions. Based on TEM results, at the peak hardnessof the two-step aging, the number density of precipitates was increased by increasing Cu contents, due to the suppression ofnanocluster formation during natural aging.

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