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Effect of aging on the mechanical properties and corrosion susceptibility of an Al-Cu-Li-Zr alloy containing Sc

Authors
Journal
Rare Metals
1001-0521
Publisher
Springer-Verlag
Publication Date
Volume
27
Issue
2
Identifiers
DOI: 10.1016/s1001-0521(08)60105-9
Keywords
  • Al-Li Alloys
  • Aging
  • Microstructure
  • T1Phase
  • Corrosion

Abstract

Abstract The effects of aging on the microstructure, mechanical properties, intergranular corrosion, and exfoliation corrosion of an Al-3.5Cu-1.5Li-0.22(Sc+Zr) alloy have been investigated. The results show that the alloy has the character of age hardening, and the major phase of precipitation and strengthening is the T 1 phase. The aging temperature and aging time have a significant effect on the amount and distribution of the T 1 phase. The proper artificial single-aging treatment of the alloy is at 160r°C for 40 h. The intergranular corrosion and exfoliation corrosion of the alloy are caused by the anodic dissolution of the T 1 phase and the precipitate-free zone (PFZ). With increasing the aging time to overaged, the T 1 phase coarsens, and the PFZ widens, leading to an increase in the susceptibility to intergranular corrosion and exfoliation corrosion.

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