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- Title
Effect of Low Cu Content and Heat Treatment on the Microstructure and Mechanical Properties of High-Vacuum Die-Cast AlSiMgMn Alloys.
- Authors
Liu, Fei; Zheng, Huiting; Jiang, Yuanhang; Zhao, Haidong
- Abstract
AlSiMgMn-xCu (x = 0.1wt.%, 0.3wt.%, 0.6wt.%, 0.8wt.%) alloys were produced by a high-vacuum die-casting (HVDC) process, and the effect of varying Cu contents on the microstructure evolution and mechanical properties under as-cast and T6 heat-treatment conditions have been systemically investigated. The results indicated that the microstructure under the as-cast state consists of α-Al, eutectic Si, β-Mg2Si, Q-Al5Cu2Mg8Si6, and θ-Al2Cu phases. Increasing the Cu content brought about an apparent change in the main precipitate of the alloys after T6 heat treatment. When the Cu content is 0.1 wt.%, the precipitate is only β′′ phase. As the Cu content increases to 0.3 wt.% and 0.6 wt.%, the β′′ and Q′ phases were co-precipitated in the α-Al matrix. As the Cu content further increases to 0.8 wt.%, the θ′ and Q′ phases were co-precipitated in the α-Al matrix and the predominant precipitate was the θ′ phase. As the content of Cu increases from 0.1 wt.% to 0.8 wt.%, the yield strength and ultimate tensile strength after T6 heat treatment increase to 241 MPa and 366 MPa, respectively. Meanwhile, the elongation increases to 8.2%. The improved mechanical properties are mainly attributed to the co-precipitation of the β′′, Q′, and θ′ phases.
- Subjects
MECHANICAL heat treatment; COPPER; ENTHALPY; TENSILE strength; HYPEREUTECTIC alloys; SILICON alloys; HEAT treatment
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2023, Vol 75, Issue 4, p1345
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-022-05651-z