Effects of Cu content on the precipitation process of Al–Zn–Mg alloys

Xu, Fang; Du, Yong; Song, Min; Li, Kai; Jiang, Chao

doi:10.1007/s10853-012-6714-6

Cited by 38 publications

(10 citation statements)

References 15 publications

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“…The strengthening of the heat-treatable wrought Al-Zn-Mg-Cu aluminium alloy is predominately determined by the type and size of precipitates [5][6][7]. The precipitation sequence is usually described as: supersaturated solid solution → GP zones → η′ phase → η phase.…”

Section: Introductionmentioning

confidence: 99%

Investigation of mechanical and corrosion properties of an Al–Zn–Mg–Cu alloy under various ageing conditions and interface analysis of η′ precipitate

Yang

Qian³

et al. 2015

Materials & Design

148

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The mechanical and corrosion properties under various ageing treatment conditions were investigated in an Al-6.0Zn-2.3Mg-1.8Cu-0.1Zr (wt.%) alloy. The results showed that the retrogression and re-ageing (RRA) were capable of providing higher strength and improved corrosion resistance in comparison with the conventional T6 and T74 ageing. The optimised ageing process had been found to be 120°C/24 h + 180°C/60 min + 120°C/24 h for the experimental alloy. The results obtained from the high resolution transmission electron microscopy (HRTEM) interface analysis revealed that a semi-coherent stress field between the η′ precipitate and the Al matrix was critical in controlling the strength of the Al-Zn-Mg-Cu alloy heat-treated under different conditions. Furthermore, Transition Matrix calculation showed that the η′ phases had only two zone axes: [1 ̅ 21

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Section: Introductionmentioning

confidence: 99%

Investigation of mechanical and corrosion properties of an Al–Zn–Mg–Cu alloy under various ageing conditions and interface analysis of η′ precipitate

Yang

Qian³

et al. 2015

Materials & Design

148

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“…The number density of precipitates per unit area in each alloy was about 1400, 1500 and 3300 µm ¹2 respectively for ZM42, 42C and 42HC alloys and it looks like that it is depended on the total amount of solute atoms. 5,6,11,16,17) SAED patterns obtained for 3 alloys show ©A, TA phases and also spots near Al forbidden reflections as shown in Fig. 5(e) and (f ) by open square symbol which position corresponds to GPB-II zones or the second clusters that we have proposed recently.…”

Section: Effect Of Cu Additionmentioning

confidence: 54%

Effect of Copper Addition on Precipitation Behavior near Grain Boundary in Al–Zn–Mg Alloy

et al. 2019

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The effect of Cu-addition on age-hardening and precipitation have been investigated by hardness measurement, tensile test, high resolution transmission electron microscopy (HRTEM) and high angle annular dark field scanning transmission electron microscopy (HAADF-STEM) techniques. Higher hardness, strength, and lower elongation were caused by increasing amount of Zn + Mg because of increased number density of precipitates. Cu addition also provided even higher peak hardness, strength, and lower elongation. The alloy containing highest Cu content had fine precipitates of GPB-II zones or the second clusters, in the precipitate free zones (PFZs) and the matrix, together with ©A/© in the matrix from the early stage of aging. Two regions have been confirmed as the PFZs in the peak aged alloy containing highest Cu: (i) nearest to grain boundary (GB) about 70 nm in width (n-PFZ) and (ii) conventional PFZ about 400 nm in width which can be confirmed by conventional TEM (con-PFZ). The con-PFZ contains fine precipitates consisting of GPB-II zones or the second clusters, even for 2 minutes of aging at 473 K which were not present in the n-PFZ. The fine precipitates, GPB-II zones or the second clusters in the con-PFZ and the matrix disappeared at overaged condition.

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“…Previous studies have shown that most of T and η phases are dissolved into the matrix during solution treatment [14] . The S-Al 2 CuMg phase adheres to the η-MgZn 2 phase to form nucleation, and then solid-state phase transition occurs.…”

Section: Resultsmentioning

confidence: 99%

Effects of Cu content on microstructure and mechanical properties of rheo-diecasting Al-6Zn-2Mg-xCu alloys

et al. 2022

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Despite the high cost and difficult production process, the 7xxx (Al-Zn-Mg-Cu) wrought aluminum alloys are still widely used in aerospace industry due to its wellperforming mechanical qualities and superior fatigue resistance [1][2][3] . Recently, there has been a booming interest in producing cast Al-Zn-Mg-Cu alloys with the goal of lowering production costs and developing shaped products while maintaining outstanding mechanical qualities [4] .Several processes, such as spray deposition, electromagnetic casting, powder metallurgy, semi-solid casting and quick solidification, have been employed

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Effects of Cu content on the precipitation process of Al–Zn–Mg alloys

Cited by 38 publications

References 15 publications

Investigation of mechanical and corrosion properties of an Al–Zn–Mg–Cu alloy under various ageing conditions and interface analysis of η′ precipitate

Investigation of mechanical and corrosion properties of an Al–Zn–Mg–Cu alloy under various ageing conditions and interface analysis of η′ precipitate

Effect of Copper Addition on Precipitation Behavior near Grain Boundary in Al–Zn–Mg Alloy

Effects of Cu content on microstructure and mechanical properties of rheo-diecasting Al-6Zn-2Mg-xCu alloys

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