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Microstructure and Mechanical Properties of Ultra-high Strength Al-7.88Zn-2.05Mg-1.70Cu-0.19Er Aluminum Alloy Thin Strip
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1.School of Materials Science and Engineering, Central South University, Changsha 410083, China;2.Light Alloy Research Institute, Central South University, Changsha 410083, China

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National Natural Science Foundation of China (51274245)

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    Abstract:

    The microstructure, mechanical properties, and corrosion resistance of ultra-high strength cold-rolled thin strips of Al-7.88Zn-2.05Mg-1.70Cu-0.19Er alloy were investigated. Results reveal that the excellent comprehensive properties of the cold-rolled thin strips with 0.5 mm in thickness are achieved after solid solution treatment of 475 °C/1 h/water quenching and double aging treatment of 120 °C/6 h+150 °C/24 h. The hardness, ultimate tensile strength, yield strength, and elongation of the thin strips are 1859.1 MPa, 669.4 MPa, 624.1 MPa, and 11.2%, respectively. The mechanical properties of double-aged strip are comparable to those of alloy after peak-aging treatment. The electrical conductivity, exfoliation corrosion rating, and stress corrosion cracking sensitivity of the thin strip are 35.5%IACS, EA, and 4.07%, respectively. The fine spherical Al3(Er, Zr) and η? phases are uniformly distributed in the Al matrix, and most precipitates are coherent with Al matrix lattice. The tiny discontinuous grain boundary precipitate η phase mainly causes the lower stress corrosion sensitivity of the studied alloy.

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[Huang Ting, Liu Huiqun, Lin Gaoyong, Zheng Ying. Microstructure and Mechanical Properties of Ultra-high Strength Al-7.88Zn-2.05Mg-1.70Cu-0.19Er Aluminum Alloy Thin Strip[J]. Rare Metal Materials and Engineering,2022,51(9):3189~3196.]
DOI:10.12442/j. issn.1002-185X.20210708

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History
  • Received:August 10,2021
  • Revised:November 19,2021
  • Adopted:January 22,2022
  • Online: September 30,2022
  • Published: September 27,2022