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Effect of pre-recovery on microstructure and properties of rolled Al-12.18Zn-3.31Mg-1.43Cu-0.20Zr-0.04Sr aluminum alloy

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International Journal of Minerals,Metallurgy and Materials 2019年第2期26卷 241-250页

作者： Cheng-bin Cai Xiao-jing Xu Jin-dong Huang Shi-hao Ju Qing Ding Cheng-song Wang Engineering Institute of Advanced Manufacturing and Modern Equipment Technology Jiangsu University

The independently designed and manufactured ultra-high-strength aluminum alloy Al-12.18 Zn-3.31 Mg-1.43 Cu-0.20 Zr-0.04 Sr was investigated via scanning electron microscopy observations, X-ray diffraction analysis, hardness tests, electrical conductivity tests, tensile tests, intergranular corrosion tests, and exfoliation corrosion tests. The effect of pre-recovery on the microstructure and mechanical properties of this aluminum alloy was also studied. The results show that the pre-recovery heat treatment releases deformation energy, inhibits recrystallization, and decreases the dislocation density. Although the pre-recovery heat treatment has little effect on the hardness, electrical conductivity, and elongation of this aluminum alloy, it can dramatically improve the alloy's tensile strength(the maximum tensile strength increased from 785.0 MPa to 809.2 MPa). Moreover, the tensile properties of this aluminum alloy have a certain degree of isotropy, and the pre-recovery heat treatment does not affect this property. In addition, the rolled aluminum alloy exhibits good corrosion resistance, but the effect of the pre-recovery heat treatment on the alloy's resistance to intergranular and exfoliation corrosion is negligible.

关键词： ultra-high strength aluminum alloy pre-recovery microstructure mechanical property corrosion resistance

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Effect of pre-recovery on subsequent recrystallization kinetics in moderately deformed and supersaturated Al–Mn alloys

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Journal of Central South University 2018年第3期25卷 534-542页

作者： HUANG Li CAO Ling-fei HUANG Guang-jie WU Xiao-dong XIA Ming-yong College of Materials Science and Engineering Chongqing University

The effect of pre-recovery on the recrystallization kinetics of a supersaturated Al–Mn alloy annealed at 530°C was *** results show that the pre-recovery treatment can lead to faster recrystallization kinetics at the initial stage but cause sluggish recrystallization at the later *** different recrystallization behavior is explained by the formation of precipitates-free zones and the consumption of driving force during the pre-recovery *** promoted recrystallization at the early stage can be interpreted by the promotion of recrystallization nucleation through sub-grain growth to a critical size inside precipitates-free zones.A simple model is presented to describe the nucleation of recrystallization with pre-recovery treatment in the supersaturated Al–Mn alloys.

关键词： pre-recovery recrystallization nucleation and growth kinetics precipitation

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