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논문 기본 정보

자료유형
학술저널
저자정보
JiWoo Im (Korea Institute of Industrial Technology) JaeYeol Jeon (Korea Institute of Industrial Technology) MinYoung Song (Korea Institute of Industrial Technology) SungKil Hong (Chonnam National University) JaeHwang Kim (Korea Institute of Industrial Technology)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.25 No.4
발행연도
2019.1
수록면
860 - 868 (9page)

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초록· 키워드

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Two-step aging with the diff erent natural aging times and chemical compositions was carried out in Al–Mg–Si alloys toinvestigate the clustering and two-step aging behavior. The activation energies of cluster formation through the Kissingermethod were analyzed as 69.4, 67.3 and 73.8 kJ/mol for the 9M4S, 6M6S and 3M10S, respectively. A similar hardnesswas identifi ed for short-term natural aging for 3.6 ks regardless of the Mg/Si ratio. On the other hand, a lower hardness wasidentifi ed in the 3M10S (Mg/Si = 0.3) than in 9M4S (Mg/Si = 2.5) and 6M6S (Mg/Si = 1) for long-term natural aging for4838.4 ks. The hardness increase during the two-step aging was due to the formation of a β″ phase during artifi cial agingbased on structure analysis of high resolution transmission electron microscope images. There was a hardness decrease atthe initial stage of the two-step aging at 170 °C in the case of long-term naturally-aged specimens. The hardness decreasewas caused by the partial dissolution of the Mg–Si co-cluster, which was infl uenced by the Mg/Si ratio. Meanwhile, the hardnessincrease during two-step aging was promoted for 6M6S and the higher number density of the β″ phase was confi rmed.

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