2009•Materials Science and Engineering of Powder MetallurgyRequires access
Effect of triple-solution on microstructure and exfoliation corrosion properties of Al-Zn-Mg-Cu aluminum alloy
Xiao Dai-hong
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Abstract
The effects of triple solid-solution heat treatment(here after,be simplified as triple-solution) on microstructure and exfoliation corrosion behavior of Al-Zn-Mg-Cu aluminum alloy was investigated by optical microscopy and SEM observation,Rockwell hardness and electric conductivity measurement,tensile properties and exfoliation corrosion test.The results show that the discontinuous precipitations on the grain boundaries are coarsened and the discrete degree of it is increased after triple-solution.Meanwhile it is found that the resistance to exfoliation corrosion of Al-Zn-Mg-Cu aluminum alloy is markedly improved by triple-solution and the strength is maintained to 610 MPa.Compared with conventional solid-solution treatment,the electric conductivity of the Al-Zn-Mg-Cu aluminum alloy after triple-solution has increased from 30.8%(IACS) up to 33.2%(IACS),the scale of the exfoliation corrosion resistance has improved from EB+ to EA.