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Influence of dual retrogression and re-aging temper on microstructure,strength and exfoliation corrosion behavior of Al-Zn-Mg-Cu alloy

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Transactions of Nonferrous Metals Society of China 2012年第4期22卷 803-809页

作者：彭国胜陈康华陈送义方华婵中南大学粉末冶金国家重点实验室长沙410083

Influence of dual retrogression and re-aging（dual-RRA） temper on microstructure,strength and exfoliation corrosion（EC） behavior of Al-Zn-Mg-Cu alloy was investigated by hardness measurements,tensile properties tests,exfoliation corrosion tests,transmission electron microscopy（TEM） and scanning electron microscopy（SEM） observation combined energy dispersive X-ray detector（EDX） ***-RRA temper maintains the matrix precipitates（MPs） similar to RRA temper,meanwhile obtains coarser and sparser grain boundary precipitates（GBPs） as well as higher Cu and lower Zn content compared with T76 ***,dual-RRA temper not only keeps strength equivalent to the RRA temper but also obtains higher EC resistance than T76 temper.

关键词： aluminum alloy retrogression and re-aging microstructure tensile properties exfoliation corrosion

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Precipitation behavior and properties of extruded 7136 aluminum alloy under different aging treatments

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Chinese Journal of Aeronautics 2021年第2期34卷 612-619页

作者： Huiyan LI Lina JIA Jiangnan HUANG Yue MA School of Materials Science and Engineering Beihang UniversityBeijing 100083China

In this work, the mechanical properties and electrical conductivity of the extruded 7136 aluminum alloy treated by single-stage aging treatment(T6), retrogression and re-aging treatment(RRA), and multiple retrogression and re-aging treatment have been investigated by means of hardness measurements, electrical conductivity tests and tensile tests. The results have shown that the properties of the 7136 alloy such as hardness, tensile strength and electrical conductivity were sensitive to retrogression time(within 90 min). With prolonging the retrogression time, the tensile strength was enhanced first and then decreased, yet the electrical conductivity was continuously increased. The 60 min-treated alloy performed the highest tensile strength(716 MPa), whereas the 90 min-treated alloy possessed the highest electrical conductivity(33.95%IACS). Compared with the T6-treated alloy, the tensile strength and electrical conductivity were improved by 3.3%and 18.9%, respectively. The electrical conductivity showed an obvious increase with repetitious times of the RRA treatment. After 3 RRA60 treatment, a good combination of tensile strength(705 MPa) and electrical conductivity(33.20%IACS) can be obtained. Compared with the T6 condition, the tensile strength and electrical conductivity were improved by 1.7% and 16.3%, respectively. The mechanism of microstructure evolution under different aging treatments has been discussed in detail.

关键词： 7136 aluminum alloy Electrical conductivity Mechanical properties Microstructure retrogression and re-aging

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维普期刊数据库

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Effect of Pre-aging in RRA Treatment on Corrosion Behavior of Spray Formed 7075 Alloy

Effect of Pre-aging in RRA Treatment on Corrosion Behavior o...

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2016中国有色合金及特种铸造发展论坛

作者： SU Rui-ming QU Ying-dong LI Xiang YANG Dong-sheng YOU Jun-hua LI Rong-de School of Material Science and Engineering Shenyang University of Technology

The effects of pre-aging of RRA treatment on microstructure,mechanical properties,intergranular corrosion(IGC) and exfoliation corrosion(EXCO) behavior of spray formed 7075 aluminum alloy were investigated by transmission electron microscope(TEM),scanning electron microscope(SEM),tensile test,IGC test and EXCO *** results show that the mechanical properties and conductivity of spray formed 7075 alloy could be improved by the under aging as the pre-aging of RRA *** re-aging treatment with the under aging as the pre-aging treatment,lots of tiny dispersive MPt precipitated out again in matrix,the GBP were totally separated and the PFZ were *** tensile strength and yield strength of the alloy are 782 and 726 MPa,respectively,which are higher than that after peak aging treatment or conventional RRA treatment,the IGC and EXCO resistance of the 7075 alloy is excellent with 27.9 μm of corrosion depth and EA of corrosion rating.

关键词： spray forming 7075 aluminum alloy retrogression and re-aging pre-aging corrosion

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