Ag含量对Al-Mg-Si 合金时效析出行为及性能的影响

doi:10.11896/cldb.20120268

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Abstract The effects of Ag content on microstructures, intergranular corrosion (IGC), age hardening and precipitation kinetics of Al-Mg-Si alloys were investigated by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), differential scanning calorimetry (DSC) and Vickers hardness test. The results show that at the peak-ageing state, the main strengthening phase is β″ phase in the grain and β′ phase on the grain boundary, while there is a small amount of Al-Fe-Si-(Mn) dispersoid in both grain boundaries and grains. With the increase of Ag content, the peak hardness and age hardening rate increase. Without Ag addition, the density of β′ phase on the grain boundary of the alloy is high, and the corrosion types of the alloy are IGC and local corrosion. The alloy with 0.2% (mass fraction, the same below) Ag has grain boundary β′ phase of low continuity, and shows slight IGC. The addition of excessive Ag leads to the increase of continuity of grain boundary precipitates, and the increase of corrosion sensitivity. The addition of Ag can decrease the strain strength at the interface between MgSi clusters and Al matrix, promote the precipitation of clusters and β″ phase, decrease the precipitation activation energy of β″ phase, significantly accelerate the aging precipitation response of the Al-Mg-Si alloy, and improve the thermodynamic stability of β″ phase.

Key words： Al-Mg-Si Ag intergranular corrosion β″ phase precipitation kinetics

Published: 10 July 2022 Online: 2022-07-12

CLC number:

TG146

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	Articles by authors
	ZHENG Yaya
	LUO Binghui
	WANG Li
	XIE Wei

Cite this article:

ZHENG Yaya,LUO Binghui,WANG Li, et al. Effects of Ag Addition on the Precipitation Hardening Behaviour and Properties of Al-Mg-Si Alloys[J]. Materials Reports, 2022, 36(13): 20120268-5.

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http://www.mater-rep.com/EN/10.11896/cldb.20120268 OR http://www.mater-rep.com/EN/Y2022/V36/I13/20120268

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