Mechanical properties and microstructural evolution in Al–Cu–Mg–Ag alloy with a CuxMgx/10 content

In this study, we investigate the effect of CuxMgx/10 (x = 5.0, 5.5, 6.0, 6.8 wt.%) in Al–Cu–Mg-based alloys on the mechanical properties. Of these, the Cu6.0Mg0.60 alloy shows the highest mechanical properties of σUTS = 532 MPa (σy = 504 MPa) and ε = 11.1%. The amount of CuxMgx/10 solutes affects b...

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Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2021-09, Vol.824, p.141573, Article 141573
Main Authors: So, Hyeongsub, Won, Sung-Jae, Park, Jihoon, Oh, Soong Ju, Kang, Leeseung, Kim, Kyou-Hyun
Format: Article
Language:English
Subjects:
2xxx series aluminum alloy
Alloy development
Alloys
Aluminum
Copper
Grain boundaries
Grain size
Magnesium base alloys
Mechanical properties
Microstructural investigation
Microstructure
Silver base alloys
Tensile properties
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Summary:In this study, we investigate the effect of CuxMgx/10 (x = 5.0, 5.5, 6.0, 6.8 wt.%) in Al–Cu–Mg-based alloys on the mechanical properties. Of these, the Cu6.0Mg0.60 alloy shows the highest mechanical properties of σUTS = 532 MPa (σy = 504 MPa) and ε = 11.1%. The amount of CuxMgx/10 solutes affects both macroscopic and microscopic microstructures of fabricated alloys. In the macroscopic observation, a higher content of CuxMgx/10 induces the grain size refinement and the formation of large particles in the grain boundaries. For the microscopic investigation using electron microscopies, the formation of θ′ strengthening phase is more accelerated by a higher content of CuxMgx/10 rather than the formation of Ω phase. Furthermore, microscopic structural distortion is significantly induced with a higher content of CuxMgx/10, which affects the tensile properties of the developed alloys. •Mechanical properties (σ and ε) of Al-Cu-Mg-Ag alloys are strongly dependent on the amount of CuxMgx/10.•The Al grain is significantly refined as the amount of CuxMgx/10 increases.•The formation of θ' is accelerated by higher CuxMgx/10 content while the formation of Ω phase is suppressed.•Based on the experimental results, the θ′ phase is more effective hardening phase in Al–Cu–Mg–Ag alloys than the Ω phase.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2021.141573