Influence of Mg and Si Content on Precipitates of Al-Cu-Mg-Ag-Si Alloy
The influence of Mg and Si content on the types and properties of actual precipitates in Al-Cu-Mg-Ag-Si alloy was investigated.The results show that a large amount of S phase and coarse second phases exist in the Al-Cu-Mg-Ag-Si alloy with high Mg content and regular Si content;the common θ phase and Ω phase are precipitated in the low-Mg and low-Si alloy;the common second phases in 6xxx aluminum alloys,such as σ and β"phases,appear in the alloy with low Mg content and regular Si content,and also fine and dispersed θ phases are precipitated in the alloy,which results in excellent strengthening effect of the alloy.Both Si and Mg greatly alter the precipitation sequence of the alloy,and the effect of Si cannot be offset by increasing Mg content.The addition of Si significantly inhibits the precipitation of Ωphase,while a considerable increase of Mg content can promote the precipitation of S phase.
aluminum alloyAl-Cu-Mg-Agprecipitated phaseSi elementMg element
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