Precipitation behaviour of Al–Zn–Mg–Cu alloy and diffraction analysis from η′ precipitates in four variants

Yang, Wenchao; Ji, Shouxun; Wang, Mingpu; Li, Zhou

doi:10.1016/j.jallcom.2014.05.061

Cited by 144 publications

(40 citation statements)

References 20 publications

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“…On the other hand, a retrogression and re-ageing (RRA) treatment was developed [16] to be able to obtain good corrosion resistance without significantly sacrificing the strength through forming fine precipitates inside the primary grains and coarse precipitates at grain boundaries [17,18]. Although the precipitates of η′ phase have been widely studied for Al-Zn-Mg-Cu alloys [5,19,20]. However, the strengthening mechanism of metastable η′ phase is still not fully understood in Al-Zn-Mg-Cu alloys, in particular, limited information can be found for the orientation relationships and interface structure of 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

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127

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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

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127

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“…The diffraction patterns from precipitates [indicated by white dashed ellipses in Figure 13(b)] are typical diffraction streaks of the g¢-MgZn 2 phase. [27] Figure 14 shows the effect of the Zn concentrations on the tensile properties of the Al-Mg-Si-Zn alloy after solution treatment at 510°C for 180 minutes and subsequent aging at 180°C for 90 minutes. Similar to the properties in the as-cast condition, increasing the Zn concentrations results in an increase in the yield strength but a decrease in elongation.…”

Section: Resultsmentioning

confidence: 99%

“…Table IV summarizes the precipitates observed in Al-Mg-Znbased alloys. [12][13][14]27,31,32,34,35] g-Type precipitates are observed in alloys with magnesium concentration below 2.5 wt pct, while s-Mg 32 (Al, Zn) 49 phases are observed for relatively high magnesium concentration. A numerical model has also been established to prove that the s phase exists with the increasing Mg content in Al-6 wt pct Zn-2 wt pct Cu-(1 to 4) wt pct Mg alloys.…”

Section: Resultsmentioning

confidence: 99%

“…For AlZnMg alloys, the typical precipitate sequence is a fi GP fi g¢-MgZn 2 fi g-MgZn 2 . [12,14,27,35] Based on the brightfield TEM images shown in Figure 13, high-density short rod-shaped fine precipitates ranging in the size from 5 to 10 nm are observed in the microstructure, which has been confirmed to be the g¢-MgZn 2 phase. [27] C. Mechanical Properties of the Al-Mg-Si-Zn Alloys…”

Section: Resultsmentioning

confidence: 99%

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Effect of Zn Concentration on the Microstructure and Mechanical Properties of Al-Mg-Si-Zn Alloys Processed by Gravity Die Casting

Zhu

et al. 2018

Metall Mater Trans A

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The microstructure and mechanical properties of Al-8.1Mg-2.6Si-(0.08 to 4.62)Zn alloys (in wt pct) have been investigated by the permanent mold casting process. X-ray diffraction analysis shows that the s-Mg 32 (Al, Zn) 49 phase forms when the Zn content is 1.01 wt pct. With higher Zn contents of 2.37 and 3.59 wt pct, the g-MgZn 2 and s-Mg 32 (Al, Zn) 49 phases precipitate in the microstructure, and the g-MgZn 2 phase forms when the Zn content is 4.62 wt pct. Metallurgical analysis shows that the g-MgZn 2 and s-Mg 32 (Al, Zn) 49 phases strengthen the Al-8.1Mg-2.6Si-(0.08 to 4.62)Zn alloys. After solutionizing at 510°C for 180 minutes and aging at 180°C for 90 minutes, the g¢-MgZn 2 phase precipitates in the a-Al matrix, which significantly enhances the mechanical properties. Addition of 3.59 wt pct Zn to the Al-8.1Mg-2.6Si alloy with heat treatment increases the yield strength from 96 to 280 MPa, increases the ultimate tensile strength from 267 to 310 MPa, and decreases the elongation from 9.97 to 1.74 pct.

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“…The influence of alloying element precipitates on aluminium alloys is a complex issue and it is still one of the most promising topics in materials science. [3][4][5][6][7] Laser surface treatment ensures that the processed material obtains new properties due to the rapid dispersion of the heat from the melted zone. This phenomenon enables the crystallisation of very fine precipitates to occur.…”

Section: 2mentioning

confidence: 99%

Analysis of precipitates in aluminium alloys with the use of high-resolution electron microscopy and computer simulation

Matus¹,

Tomiczek²,

Gołombek³

et al. 2017

Mater. Tehnol.

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This paper presents the results of the tests using high-resolution transmission electron microscopy (HRTEM) with both transmission and scanning modes, as well as energy-dispersive-spectroscopy (EDS) investigation of the AlSi9Cu alloy after laser surface remelting. The possibility of using a computer simulation to identify precipitates in the analysed alloy was also explored. The obtained results and computer simulations were compared. Moreover, this article presents the advantages of the computer aid in solving the diffraction patterns and precipitates in supercell simulations. Keywords: precipitation, crystallography, TEM, computer simulations V prispevku so predstavljeni rezultati preiskave AlSi9Cu zlitine z laserskim pretaljevanjem povr{in z uporabo transmisijske elektronske mikroskopije z visoko lo~ljivostjo (angl. HRTEM) na dva na~ina: s transmisijskim skeniranjem, kot tudi z energijsko disperzijsko spektroskopijo (angl. EDS). Z uporabo ra~unalni{ke simulacije je bila preiskana mo`nost identifikacije delcev v analizirani zlitini. Dobljeni rezultati in ra~unalni{ke simulacije so bili primerjani. Poleg tega~lanek predstavlja prednosti ra~unalni{ke simulacije pri {tudiji vzorcev difrakcije in oborin v posameznih stanjih celic.

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Precipitation behaviour of Al–Zn–Mg–Cu alloy and diffraction analysis from η′ precipitates in four variants

Cited by 144 publications

References 20 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 Zn Concentration on the Microstructure and Mechanical Properties of Al-Mg-Si-Zn Alloys Processed by Gravity Die Casting

Analysis of precipitates in aluminium alloys with the use of high-resolution electron microscopy and computer simulation

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