Microstructure and Mechanical Properties of DC Cast 7065 Aluminum Alloy

He, Ketai; Tan, Zimeng; Zheng, Xusheng; Zhang, X M; Zhou, Kechao

doi:10.1088/1742-6596/1906/1/012051

J. Phys.: Conf. Ser.

2021

DOI: 10.1088/1742-6596/1906/1/012051

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Microstructure and Mechanical Properties of DC Cast 7065 Aluminum Alloy

Ketai He

Zimeng Tan

Xusheng Zheng

et al.

Abstract: The microstructure and mechanical properties of 7065 alloy was investigate in this present work. The main intermetallic phases of the 7065 alloy identified by EDS analysis were (Mg,Cu) 2Zn, Al 2Cu and Al 7Cu 2Fe. The microstructure of the 7065 alloy after hot rolling mainly consists elongated fibrous grains containing sub-grains, indicating that dynamic recovery is the primarily mechanism during hot rolling. The 7065 alloy has lower quench-sensitive and higher mechanical properties than that of the 7050 alloy.

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Cited by 3 publications

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Influence of La additions on solidification and microstructure in the as-cast state of the aluminium alloy EN AW-7175

Balaško,

Vončina,

Nagode

et al. 2024

J Therm Anal Calorim

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The high-strength aluminium alloys of the 7xxx series, which belong to the Al–Zn–Mg–Cu system, are known for their exceptional properties and are often used for applications where strength, fatigue resistance, stress corrosion resistance and wear resistance are required. The alloy EN AW-7175 requires an understanding of the precipitation process during solidification and cooling, where different phases are formed depending on the Zn/Mg ratio and cooling rate. Microstructural defects in the as-cast state affect the mechanical properties, prompting the investigation of La additions to refine the microstructure and improve the mechanical properties. In this study, the influence of La additions on the solidification and microstructure of the alloy EN AW-7175 in the as-cast state is investigated. Thermodynamic calculations, DSC and SEM analyses were performed. Samples with La additions (0.05–0.17 mass%) were compared with a reference sample (0 mass% La). La additives have only a minimal effect on the liquidus temperature and show minor differences in the solidus temperature in equilibrium calculations. The solidification interval decreases slightly compared to the reference sample, which is consistent with the Scheil simulations. The DSC results show reduced liquidus and solidus temperatures, while the solidification interval remains largely unchanged by the addition of La. The addition of La alongside Al13Fe4, Mg2Si and the eutectic α(Al) + σ[Mg(Zn, Cu, Al)2] leads to the formation of two new La-based phases: Al20Cr2La and LaSi2. Al20Cr2La modifies the Al45Cr7 phase and solidifies first, while LaSi2 modifies Mg2Si. As the La content increases, the Mg2Si content decreases until it completely disappears at a La content of more than 0.1 mass%. On the contrary, according to the literature, the grain size increases somewhat with a higher La content.

show abstract

Influence of La additions on solidification and microstructure in the as-cast state of the aluminium alloy EN AW-7175

Balaško,

Vončina,

Nagode

et al. 2024

J Therm Anal Calorim

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show abstract

Effects of Mg contents on microstructures and corrosion behaviors of homogenization Al-Zn-Mg-Cu alloys

Huang,

Yang,

Sun

et al. 2023

Corrosion Science

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The evolution mechanism of the second phase during homogenization of Al-Zn-Mg-Cu aluminum alloy

Huang,

Yang,

Zheng

et al. 2023

Materials & Design

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Microstructure and Mechanical Properties of DC Cast 7065 Aluminum Alloy

Cited by 3 publications

References 7 publications

Influence of La additions on solidification and microstructure in the as-cast state of the aluminium alloy EN AW-7175

Influence of La additions on solidification and microstructure in the as-cast state of the aluminium alloy EN AW-7175

Effects of Mg contents on microstructures and corrosion behaviors of homogenization Al-Zn-Mg-Cu alloys

The evolution mechanism of the second phase during homogenization of Al-Zn-Mg-Cu aluminum alloy

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