Effects of Mg contents on microstructures and second phases of as-cast Al–Zn–Mg–Cu alloys

Huang, Rensong; Li, Mengnie; Yang, Hongfu; Lu, Shumeng; Zuo, Hanning; Zheng, Sheng; Duan, Yonghua; Yuan, Xin

doi:10.1016/j.jmrt.2022.10.050

Cited by 33 publications

(4 citation statements)

References 34 publications

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“…Intermetallic compounds appear brighter in the image because their atomic number was higher than that of the Al matrix. As-cast Al-Mg-Zn-Cu alloys are generally composed of an α(Al) matrix and non-equilibrium eutectic structures, including α-Al, η-Mg (Zn,Al,Cu) 2 , S-CuMgAl 2 , Al 7 Cu 2 Fe and Mg 2 Si [33][34][35]. EDS analysis showed that high-density lamellar eutectic η-Mg(Zn,Al,Cu) 2 existed in all four samples (Figure 3 point A, B, D, F).…”

Section: Phase Component Analysismentioning

confidence: 99%

Study on the Influence of Erbium and Preheating Process on Mechanical Properties of As-Cast 7055 Aluminum Alloy

2023

Materials

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Although 7055 aluminum alloy is a deformed aluminum alloy and shows excellent mechanical properties after recrystallization and large deformation, through this method, its application range is enriched if rare earth is added, and the rare earth phase dispersion is promoted by heat treatment. This article used optical microscopy, scanning electron microscopy energy dispersive spectroscopy (SEM-EDS), X-ray diffraction (XRD), micro Vickers hardness, and room temperature stretching methods to study the as-cast 7055-xEr (x = 0 wt.%, 0.2 wt.%, 0.4 wt.%, 0.6 wt.%, 0.8 wt.%) aluminum alloy after being subjected to 460 °C × 3 h homogenization and 410 °C × 1 h solid solution + 150 °C × 12 h aging treatment for the changes in its microstructure and properties. The results indicated that: when 0.2 wt.%Er was added to 7055 aluminum alloy after a solution at 410 °C × 1 h and aging at 150 °C × 12 h, the dendrite structure was significantly reduced, the grain thinning was obvious, and the distribution was uniform; the Al8Cu4Er phase appeared in the lamellar eutectic η-Mg(Zn,Al,Cu)2 structure at grain boundaries, and the hardness reached 168.8 HV. The yield strength, tensile strength, and elongation were 542.12 MPa, 577.67 MPa, and 8.36%, respectively.

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Section: Phase Component Analysismentioning

confidence: 99%

Study on the Influence of Erbium and Preheating Process on Mechanical Properties of As-Cast 7055 Aluminum Alloy

2023

Materials

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“…The solid solubilit decreases significantly with the decrease in temperature, which have a strong age-hard ening ability and was the main strengthening phase of the Al-Zn-Mg-Cu alloy. With th increase in Mg content, α(Al) grains were refined (Figure 4) and the tertiary dendrites and the T(AlCuMgZn) phases increased [7]. In addition, the increase in Mg content could im prove the volume fraction of the precipitate phase during aging treatment, thus improv ing the yield strength [8].…”

Section: Mgmentioning

confidence: 99%

Research Status and Prospective Properties of the Al-Zn-Mg-Cu Series Aluminum Alloys

Wang

2023

Metals

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An Al–Zn–Mg–Cu alloy has high specific strength, good corrosion resistance, fracture toughness and fatigue resistance. It is one of the most important structural materials in the fields of aviation, aerospace, weapons and transportation; in particular, it plays a huge role in the field of aerospace. In order to optimize the strength, toughness and corrosion properties of an Al–Zn–Mg–Cu alloy, the focus of research on this alloy has always been on the alloying process. The effects of the main alloying elements, trace alloying elements and rare earth elements on the microstructure and properties of Al–Zn–Mg–Cu alloys are briefly introduced in this paper, and future research directions are proposed.

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“…The zinc element is above nine mass percentages, while the Mg and Cu contents show some variations. The high zinc content combined with the Mg element leads to obvious precipitation after aging and greatly contributes to strength [9]. Cu elements also work on strength and adjust the resistance of both stress corrosion cracking (SCC) and fatigue crack propagation (FCP) by affecting the composition of precipitates [10].…”

Section: Introductionmentioning

confidence: 99%

Study on the effect of enhanced magnesium and copper contents on microstructure and property of Al-Zn-Mg-Cu alloys with high zinc element content during fabrication processes

Zhou,

Wen,

Yin

et al. 2023

J. Phys.: Conf. Ser.

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Magnesium and copper elements can significantly influence precipitation characteristics, and furtherly change the property of final products in Al-Zn-Mg-Cu alloys. The current work chose a high Zn-containing Al-Zn-Mg-Cu alloy with synchronously enhanced magnesium and copper contents. Related microstructure and property were thoroughly investigated during the preparation process. The results showed that the solidification phase in as-cast microstructures was mainly AlZnMgCu. At the same time, the amount of it was enhanced with the increased content of magnesium and copper elements. After homogenization by 400°C/10h+472°C/56h, the eutectic ones dissolved into the α(Al), and only a sporadically distributed Fe-rich phase was observed. Mg(Zn, Cu, Al)2 phases with dense distribution and small size existed in extruded microstructure, most of them were re-dissolved in the α(Al) by solution treated with a regime of 472°C/4h. After single aged by 120°C/24h, the strength possessed an incremental trend with the increased content of magnesium and copper elements, while the elongation and electrical conductivity showed an opposite trend. MMC alloy possessed the largest fracture toughness value. When the alloys were aged by double-stage regimes, the strength, and electrical conductivity had incremental trends, while elongation possessed a decremental trend, as same as the single-aging ones.

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Effects of Mg contents on microstructures and second phases of as-cast Al–Zn–Mg–Cu alloys

Cited by 33 publications

References 34 publications

Study on the Influence of Erbium and Preheating Process on Mechanical Properties of As-Cast 7055 Aluminum Alloy

Study on the Influence of Erbium and Preheating Process on Mechanical Properties of As-Cast 7055 Aluminum Alloy

Research Status and Prospective Properties of the Al-Zn-Mg-Cu Series Aluminum Alloys

Study on the effect of enhanced magnesium and copper contents on microstructure and property of Al-Zn-Mg-Cu alloys with high zinc element content during fabrication processes

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