Role of particles on microstructure and mechanical properties of the severely processed 7075 aluminium alloy

Hidalgo-Manrique, P.; Cepeda-Jiménez, C.M.; Orozco‐Caballero, Alberto; Ruano, Oscar Antonio; Carreño, Fernando

doi:10.1007/s10853-013-7767-x

Cited by 13 publications

(10 citation statements)

References 22 publications

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“…Several reports are now available describing the evolution of precipitates and dispersoids in Al alloys during SPD processing and subsequent heat treatments, and these data provide information on their underlying properties [8,9,[22][23][24][25]. For example, GP zones nucleate in the 7050 Al alloy during one pass of ECAP at room temperature and it was shown that the presence of these ordered phases, allied with the high density of dislocations after ECAP processing, accelerates the nucleation and growth of η' and η precipitates during post-ECAP aging at 433 K for 60 h [22].…”

Section: Introductionmentioning

confidence: 99%

“…In practice, dispersoids have different thermal stabilities and pinning capabilities according to their sizes and coherency with the Al matrix. For example, the Cr-rich phase in a 7075 Al alloy was thermally stable while the Mg-Zn particles gradually coarsened with increasing numbers of passes during processing by accumulative roll bonding (ARB) [24].…”

Section: Introductionmentioning

confidence: 99%

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Characterization of precipitates in an Al-Zn-Mg alloy processed by ECAP and subsequent annealing

Afifi

Wang

Pereira

et al. 2018

Materials Science and Engineering: A

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Experiments were conducted to examine the influence of equal-channel angular pressing (ECAP) and post-ECAP annealing on the microstructures of an Al-Zn-Mg alloy. The results show that precipitates, mainly of the η', η (MgZn 2), T (Al 20 Cu 2 Mn 3) and E (Al 18 Mg 3 Cr 2) phases, are fragmented to fine spherical precipitates during ECAP processing for 4 and 8 passes. After post-ECAP annealing at 393 and 473 K for 20 h, precipitates with larger sizes lie primarily along the grain boundaries and finer particles are evenly distributed within the grains. Increasing the numbers of ECAP passes from 4 to 8 leads to an increase in the volume fraction of the finer precipitates in the ECAP-processed and annealed alloy. After 4 passes and heat treatment at 473 K, the precipitates are slightly larger compared with the alloy processed under identical conditions and annealed at 393 K. Nevertheless, significant coarsening is evident after processing for 8 passes and increasing the annealing temperature from 393 to 473 K. Different types of precipitates are effective in impeding grain growth during the post-ECAP annealing even at 473 K for 20 h. In addition, η precipitates form within the T and E phases after both ECAP and post-ECAP annealing.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of precipitates in an Al-Zn-Mg alloy processed by ECAP and subsequent annealing

Afifi

Wang

Pereira

et al. 2018

Materials Science and Engineering: A

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“…According to these studies, grain refinement takes place in a gradual manner which can be characterized as continuous recrystallization. In the particular case of aluminium, studies on the microstructural evolution during ARB have been widely performed on pure aluminium [6] and several alloys such as AA3003 [5], AA6061 [4] and AA8006 [8], while a few studies have been performed on the aeronautical 7075 Al alloy [10][11][12], despite the large advantages that would arise from refining its microstructure. A previous work [10] revealed that, as a high-strength alloy, the 7075 Al alloy needs to be processed at a minimum temperature of 300ºC in order to attain sufficient bonding and good workability.…”

Section: Introductionmentioning

confidence: 99%

“…Although extensive studies have been conducted regarding the microstructural evolution during ARB, there is only limited quantitative information available on the texture evolution during this process [15][16][17][18], despite the fact that the texture affects the ductility and the mechanical anisotropy which, in turn, determine the material formability. Moreover, texture measurements during ARB have been made after the roll-bonding steps, but never after the inter-pass heating stages, where significant texture changes may take place as a consequence of certain restoration processes, such as discontinuous recrystallization [12].…”

Section: Introductionmentioning

confidence: 99%

Evolution of the microstructure, texture and creep properties of the 7075 aluminium alloy during hot accumulative roll bonding

Hidalgo-Manrique¹,

Cepeda-Jiménez²,

Orozco‐Caballero³

et al. 2014

Materials Science and Engineering: A

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The 7075 Al alloy was severely deformed at 350ºC by a 3:1 thickness reduction per pass accumulative roll bonding (ARB) process up to six passes. It was found that discontinuous recrystallization occurs during the inter-pass annealing stages from the third pass on, attributable to the increment of the mean particle size during processing. As a consequence, the mean crystallite size did not decrease, but remained approximately constant at 440 nm along the present ARB process and the mean boundary misorientation angle reached a maximum of 30º for the 3-passes sample. However, since nucleation of new grains takes place at the pre-existing grain boundaries, discontinuous recrystallization results in slight changes in texture throughout the processing, being the orientations in the ARBed samples predominantly located along the typical rolling β-fibre. Uniaxial tests conducted at 300ºC and 350ºC revealed that the operating deformation mechanism in the processed alloy at such temperatures was grain boundary sliding, the optimum superplastic strain rate being 3•10-3-10-2 s-1. Boundary misorientation and thermal stability are the two main factors that contribute to high elongations to failure.

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“…Initial studies concerning the corrosion protection of mild and stainless steels began by using polyaniline (PAni) and polypyrrole (PPy) [5][6][7]. In the course of investigating the corrosion protection of mild and stainless steels, PAni has achieved its preferential position and interest due to its straightforward polymerization, excellent chemical stability, and high conductivity.…”

Section: Introductionmentioning

confidence: 99%

Corrosion protection of AA-7075 aluminum alloy surface by poly(o-methoxyaniline)

Moraes¹,

Bisanha²,

Mattenhauer³

et al. 2014

Proceedings of the 1st International Seminar on Industrial Innovation in Electrochemistry

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This work analyzes the corrosion protection of the aluminum alloy AA-7075-T6 by poly-o-methoxyaniline (POMA) films, deposited by casting solution. The potentiodynamic polarization curves obtained in 0.6 mol L -1 NaCl solution indicate protective characteristics of POMA compared to polyaniline (PAni), indicating superior barrier properties. Open circuit potential measurements in NaCl solution and salt spray tests also confirm the efficiency of POMA films in the protection of alloy. POMA films demonstrate appreciable corrosion resistance during the exposition in salt spray, protecting the metallic surface for up to 200 h. 11 ARTICLE TH 98Corrosion protection of AA-7075 aluminum alloy surface by Poly(o-methoxyaniline)

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Role of particles on microstructure and mechanical properties of the severely processed 7075 aluminium alloy

Cited by 13 publications

References 22 publications

Characterization of precipitates in an Al-Zn-Mg alloy processed by ECAP and subsequent annealing

Characterization of precipitates in an Al-Zn-Mg alloy processed by ECAP and subsequent annealing

Evolution of the microstructure, texture and creep properties of the 7075 aluminium alloy during hot accumulative roll bonding

Corrosion protection of AA-7075 aluminum alloy surface by poly(o-methoxyaniline)

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