Effect of aging on microstructure and properties of new Al-Zn-Mg-Cu alloy

doi:10.13251/j.issn.0254-6051.2021.03.001

Abstract

Abstract: Influences of one-stage and two-stage aging on the microstructure and comprehensive properties of a new Al-Zn-Mg-Cu alloy were studied by means of X-ray diffraction, optical metallography and scanning electron microscopy in combination with mechanical properties measurement and electrical conductivity measurement. The results show that with the increases of aging temperature and aging time, grain size increases slowly and the conductivity increases gradually. The optimal one-stage aging process of the as-cast new Al-Zn-Mg-Cu alloy is 135 ℃×12 h, the hardness of the alloy is 231.8 HV0.2, the tensile strength is 568 MPa, the elongation is 2.8%, the conductivity is 33.7%IACS. The optimal two-stage aging process is 155 ℃×4 h, the hardness of the alloy is 216.9 HV0.2, the tensile strength is 558.7 MPa, the elongation is 4.1%, and the conductivity is 35.2%IACS.

Key words: one-stage aging, two-stage aging, Al-Zn-Mg-Cu alloy, microstructure, comprehensive properties

CLC Number:

TG166.3

Xue Kemin, Li Yunhui, Xu Bing, Yan Siliang, Li Ping. Effect of aging on microstructure and properties of new Al-Zn-Mg-Cu alloy[J]. Heat Treatment of Metals, 2021, 46(3): 1-6.

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