Abstract
The parameters of duplex aging treatment of pre-stretched plates including both the temperature and the holding time of two aging stages have been systematically investigated by using electric conductivity and tensile properties tests, exfoliation corrosion experiments and TEM observations. The results show that both the first and the second age have effect on properties of plates after having been performed by different duplex aging treatments and the effect of the second age is much greater. It is found that such a duplex aging treatment is appropriate in which the temperature of the second age is 155°C and the holding time of the first and the second age is 4-6 and 28-32 hours, respectively. The ultimate strength of specimens treated with the duplex aging treatment given above can achieve 540MPa while electric conductivity is 40.5-42 %IACS.
Highlights
The Al-Zn-Mg-Cu alloys are the foundation of high-strength aluminum alloys, whose strength is the highest in commercial aluminum alloys made in traditional way
The key work of this study is to investigate the effect of different parameters of duplex aging on the materials through electric conductivity and tensile properties tests, exfoliation corrosion experiments and TEM observations
This is mainly because that the duplex aging is an over-aging treatment, the peak age can be achieved in a short time and the time decreases with the increase of aging temperature [2]
Summary
The Al-Zn-Mg-Cu alloys are the foundation of high-strength aluminum alloys, whose strength is the highest in commercial aluminum alloys made in traditional way. Besides of the high strength, the Al-Zn-Mg-Cu alloys have many attractive properties, such as low density, good ductility and so on. Due to these attractive properties, they are widely used in aeronautical industries as structural materials. Though the contradiction between strength and resistance of corrosion has already been settled abroad, it is still a puzzle in our country. It is one of the vital study aspects to research the proper heat treatment including solution and aging treatment which can improve the resistance of corrosion at no or a little expense of the strength [1]. It is possible to establish the experimental base of new duplex aging treatment to improve the overall properties of alloys
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