The effect of Cu addition on the precipitation and redissolution in Al–Zn–Mg alloy by the differential dilatometry

Hadjadj, L.; Amira, R.

doi:10.1016/j.jallcom.2009.05.082

Cited by 21 publications

(8 citation statements)

References 25 publications

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“…Regarding the maximum strength in the nugget of FSWed specimen, it should be noted that the formation of GP zone and η′ phase occurs at low-temperature aging of 20-120°C [13]. Thus, although the precipitation sequence mentioned in Eq.…”

Section: Hardness Profilementioning

confidence: 98%

“…As the dissolution temperature of η is within 300-350°C [13], this phase can be therefore completely dissolved in the stirred zone [14], while it partially dissolves in the TMAZ. On the other hand, due to the short exposure time to high temperatures, it is possible that there is insufficient time for the complete dissolution of this phase.…”

Section: Microstructural Evolutionsmentioning

confidence: 99%

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Microstructural evolution and mechanical properties during the friction stir welding of 7075-O aluminum alloy

Dehghani

Ghorbani

Soltanipoor³

2014

Int J Adv Manuf Technol

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In the present work, the AA7075-O was subjected to friction stir welding. The rotating and welding speeds were 630 rpm and 32 mm/min, respectively. The diameters of shoulder and pin were 30 and 5.7 mm, respectively. The length of threaded pin was 4.8 mm. The tensile, bending, and hardness tests were carried out on the friction stirwelded specimens. The results show that the strength of friction stir-welded sample was about 15 % (i.e., 25 MPa) higher than that of base metal. By contrast, the ductility of base metal was as much as twice that of friction stirwelded one. According to the obtained hardness profile, the maximum hardness was obtained for the stirred zone with a continuous decrease toward the base metal. This resulted in the formation of cracks after bending specimens prepared from weldment, while there was no sign of crack in the bent specimens taken from base metal. Besides, there are microstructural evolutions from the weldment toward the base metal. These include the variations in the size and distribution of precipitates. The precipitates were coarser in the heat-affected zone, while they were finer in the stirred zone.

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Section: Hardness Profilementioning

confidence: 98%

Section: Microstructural Evolutionsmentioning

confidence: 99%

Microstructural evolution and mechanical properties during the friction stir welding of 7075-O aluminum alloy

Dehghani

Ghorbani

Soltanipoor³

2014

Int J Adv Manuf Technol

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“…Aluminum alloys are the most used nonferrous metals worldwide due to their several characteristics and advantages [1,2]. Among aluminum alloys, the 7XXX series alloys stand out because the possibility to performing aging heat treatments, due their chemical composition, which make possible to obtain a tensile strength near to 600 MPa [3][4][5][6][7]. They are widely used on aircraft components because they align high tensile strength, good ductility, high corrosion resistance, high fatigue strength and low density [3,4,6].…”

Section: Introductionmentioning

confidence: 99%

“…Generally, heat treatments performed on 7XXX series aluminum alloys have as main objective to promote hardening due to a wide dispersion of dispersoids (usually η' and η) along the matrix [13]. The dispersoid η', which has a chemical formula with different ratios between the Mg and Zn depending on the literature [5,14], is metastable and coherent with the aluminum matrix. The dispersoid η (MgZn 2 ) is thermodynamically more stable and incoherent with the matrix [1,5,14].…”

Section: Introductionmentioning

confidence: 99%

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Temperature and annealing time influences on cross-rolled 7475-T7351 aluminum alloy

2022

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During production and heat treatments of aluminum alloys, numerous second phase particles form, which maximizes their mechanical properties. This work aimed to perform a correlation between Vickers hardness and X-ray diffraction results, when 7475-T7351 aluminum alloy processed by the cross rolling is subjected to annealing heat treatments (AHT) at 500 ºC for different soaking times (15, 30 and 60 minutes) and for a soaking time of 15 minutes at different temperatures (200, 300 and 400 ºC). The influence of the AHT (500 ºC / 15 minutes) on the microstructure, via scanning and transmission electron microscopy, and tensile tests properties was also investigated. The results show evidence that the Vickers hardness decreased for AHT performed at 200 and 300 ºC / 15 minutes and increase for greater temperatures and times. This behavior is probably due to modifications in the constituent/dispersoid particles and aluminum matrix observed from the X-ray analysis. Partial recrystallization and a coarsening of the precipitates was observed after the AHT at 500 ºC / 60 minutes, whose brought harmful effects on the tensile mechanical properties.

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

Song

et al. 2012

J Mater Sci

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The effect of Cu addition on the precipitation and redissolution in Al–Zn–Mg alloy by the differential dilatometry

Cited by 21 publications

References 25 publications

Microstructural evolution and mechanical properties during the friction stir welding of 7075-O aluminum alloy

Microstructural evolution and mechanical properties during the friction stir welding of 7075-O aluminum alloy

Temperature and annealing time influences on cross-rolled 7475-T7351 aluminum alloy

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

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