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Effect of Retrogression with Different Cooling Rates on Microstructure and Properties of Al-Zn-Mg-Cu Alloy Profiles
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Yue GUAN1, Jingjing GAO1, Qingkuan HU1, Penghui ZHENG1, Shuzhong KE1, Chunhua HE2, Lingying YE2
Mining and Metallurgical Engineering | 2023, 43(3) : 140 - 144
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Mining and Metallurgical Engineering | 2023, 43(3): 140-144
• MATERIALS •
Effect of Retrogression with Different Cooling Rates on Microstructure and Properties of Al-Zn-Mg-Cu Alloy Profiles
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Yue GUAN1, Jingjing GAO1, Qingkuan HU1, Penghui ZHENG1, Shuzhong KE1, Chunhua HE2, Lingying YE2
Affiliations
  • 1.Henan Key Laboratory of Fastening Connection Technology, Xinyang 464000, Henan, China
  • 2.School of Material Science and Engineering, Central South University, Changsha 410083, Hunan, China
Published: 2023-06-01 doi: 10.3969/j.issn.0253-6099.2023.03.032
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The effects of different cooling rates in retrogression and re-aging on the microstructure and properties of Al-Zn-Mg-Cu alloy profiles were investigated by performing tests on hardness, electrical conductivity, room temperature tensile, local corrosion and stress corrosion, combined with microstructure characterization by using metallographic microscopy and transmission electron microscopy. The results show that retrogression with cooling rates of 660.0, 12.7 and 0.5 ℃/min, the alloy has a tensile strength of 663.1, 653.4 and 636.9 MPa, an electrical conductivity of 35.1% IACS、35.2% IACS and 36.8% IACS, an exfoliation corrosion in the form of EC, EB-and EB, and a stress corrosion sensitivity of 4.7%, 4.0% and 3.2%, respectively. The precipitates at grain boundaries along the direction of length, with an average size of 48.7, 54.7 and 68.7 nm, are distributed with a spacing of 28.9, 33.6 and 40.3 nm, respectively. The variation in size and distribution is the main reason for variation of the above-mentioned properties. With both mechanical properties and corrosion resistance taken into consideration, it is appropriate to select cooling rates ranging from 0.5 ℃/min to 12.7 ℃/min for retrogression.

Al-Zn-Mg-Cu alloy  /  cooling rate for retrogression  /  mechanical properties  /  corrosion resistance  /  stress corrosion  /  exfoliation corrosion  /  precipitates at grain boundary  /  microstructure  /  retrogression and re-aging
Yue GUAN, Jingjing GAO, Qingkuan HU, Penghui ZHENG, Shuzhong KE, Chunhua HE, Lingying YE. Effect of Retrogression with Different Cooling Rates on Microstructure and Properties of Al-Zn-Mg-Cu Alloy Profiles[J]. Mining and Metallurgical Engineering, 2023 , 43 (3) : 140 -144 . DOI: 10.3969/j.issn.0253-6099.2023.03.032
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Year 2023 volume 43 Issue 3
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Article Info
doi: 10.3969/j.issn.0253-6099.2023.03.032
  • Receive Date：2022-12-10
  • Online Date：2026-03-05
  • Published：2023-06-01
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  • Received：2022-12-10
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Affiliations
    1.Henan Key Laboratory of Fastening Connection Technology, Xinyang 464000, Henan, China
    2.School of Material Science and Engineering, Central South University, Changsha 410083, Hunan, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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