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Effect of pre-aging treatment on the stability of Al-5.2Mg-0.45Cu-2.0Zn alloy sheet at room temperature
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State Key Laboratory of Advanced Metals and Materials,University of Science and Technology Beijing

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    Abstract:

    In this research, pre-aging treatment has been performed on our newly developed Al-5.2Mg-0.45Cu-2.0Zn alloy. Results show that pre-aging treatment not only improves the stability of the alloy sheet at room temperature, which avoids the paint-baking softening, but also enhances the age hardening response during subsequent artificial aging at 180℃. The microstructure of the T4 sample in peak aged condition consists of coarse lath-like T-Mg32(AlZn)49 phase and needle-like S-Al2MgCu phase. However, the microstructure of the T4P sample in peak aged condition only consists of high density of finer and equiaxed T phase with the S phase disappeared. Unstable clusters formed during natural aging dissolve when imposed on 180℃, which retards the precipitation process of the alloy. Stable clusters formed during pre-aging treatment serves as the nucleis of the T phase during aging at 180℃, which enhances the age hardening response of the alloy.

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[Cheng Cao, Di Zhang, Linzhong Zhuang, Jishan Zhang. Effect of pre-aging treatment on the stability of Al-5.2Mg-0.45Cu-2.0Zn alloy sheet at room temperature[J]. Rare Metal Materials and Engineering,2020,49(4):1166~1170.]
DOI:10.12442/j. issn.1002-185X.20180369

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History
  • Received:April 12,2018
  • Revised:March 25,2020
  • Adopted:December 04,2019
  • Online: May 07,2020
  • Published: