Al-Mg-Si alloys (6000 series) exhibit a promising prospect as conductive materials due to their high specific strength,high electrical conductivity,excellent formability,good weldability,cor-rosion resistance and relatively low cost [1-3].These optimum properties are largely attributed to the formation of small-sized,coherent or semi-coherent and metastable phases brought by ag-ing treatment [1,4].Previous studies have revealed that the bal-ance between high strength and high electrical conductivity could be achieved by nano-sized precipitates formed during aging treat-ment [5,6].