Precipitation during recrystallization of Al-Mn alloys

Nagahama, Katsusuke; Takahashi, Masahiro; Miki, Isao

doi:10.2464/jilm.21.444

Cited by 8 publications

(2 citation statements)

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“…Single-phase precipitation of Al 15 (Mn,Fe) 3 Si 2 was dominant, and no multi-phase precipitation was observed. In addition, numerous Al 15 (Mn,Fe) 3 Si 2 precipitates were observed in the grain interiors because Si promotes the precipitation of Al-Mn system compounds 11) . Also, to investigate the change in the amount of Al-Mn system compounds precipitated during cooling, we plotted the difference in electrical conductivity between the sample water-quenched from 600 C and the one cooled from 600 C to 400 C at 20 C/min and subsequently water-quenched as shown in Fig.…”

Section: Precipitation State Of Grain Boundaries and Grain Interiorsmentioning

confidence: 99%

Mechanism of Intergranular Corrosion of Brazed Al–Mn–Cu Alloys with Various Si Content

et al. 2017

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This study investigated the effect of post-brazing cooling rate and Si addition on the intergranular corrosion (IGC) susceptibility of brazed Al-Mn-Cu alloys by electrochemical analysis and microstructure observation. Water-quenched samples after brazing exhibited no IGC susceptibility, whereas slowly-cooled samples were prone to IGC. The results suggest that IGC is caused by precipitation during cooling. In addition, it was observed that IGC susceptibility depended on the Si content. An alloy sample with a low Si-additive content exhibited high IGC susceptibility because Mn/Cu-depleted zone was formed near the grain boundaries as a result of the preferential precipitation of Al 6 (Mn,Fe) and CuAl 2 on the grain boundaries. In contrast, moderate Si addition inhibited IGC because the decrease of the Mn content in the grain interiors due to enhanced precipitation of Al 15 (Mn,Fe) 3 Si 2 in the grain. Additionally, Cu-depleted zone also disappeared because preferential precipitation of CuAl 2 on the grain boundaries was prevented. The excess-Si alloy exhibited high IGC susceptibility because Si-depleted zone formed around the grain boundaries as a result of the preferential precipitation of coarse Si particles on the grain boundaries although the Mn/Cu-depleted zones were not formed.

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Section: Precipitation State Of Grain Boundaries and Grain Interiorsmentioning

confidence: 99%

Mechanism of Intergranular Corrosion of Brazed Al–Mn–Cu Alloys with Various Si Content

et al. 2017

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“…Further complicating unique precipitate identification in Al alloys is the tendency for multiple precipitate phases to form concurrently, with multiple variants. While significant literature over the past 70 years has covered various Al-alloy systems, this has resulted in conflicting results due to the number of various phases that may form in a given alloy [2][3][4][5].…”

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confidence: 99%