The microstructural evolution of an Al–Zn–Mg–Cu alloy during homogenization

Fan, Xing; Jiang, Daming; Meng, Qinghua; Zhong, Li Ping

doi:10.1016/j.matlet.2005.11.049

Cited by 181 publications

(78 citation statements)

References 12 publications

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“…Unlike the evolution of other phases in different aluminum alloys, [2,3,22,23] the evolution of the GB phases during homogenization, depending on the process parameters and the nature of the phases, may occur in the form of spheroidization or dissolution. The spheroidization mechanism of these phases is quite interesting.…”

Section: B Mechanisms Of the Evolution Of The Gb Phases During Homogmentioning

confidence: 99%

“…They focused on the evolution of the microstructure, low melting point phases, and the M, T, S, Al 3 Mg 2 (b), b, Al 18 Cr 2 Mg (E), and CrAl 7 phases. Fan et al [23] studied the evolution of microstructure in an Al-Zn-Mg-Cu alloy during homogenization. Ciach et al [24] conducted theoretical and experimental studies on the dendritic structure and its dissolution in aluminum-zinc alloys.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Evolution of Grain Boundary Phases during the Homogenization of AA7020 Aluminum Alloy

Eivani

Ahmed

Zhou

et al. 2009

Metall Mater Trans A

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The presence of large constitutive particles formed during solidification decreases the strength and hot workability of aluminum alloys especially when they are located in the grain boundary (GB) regions. Therefore, the evolution of these phases is a major issue in the homogenization process of these alloys. There is a lack of information on the behavior of the GB phases during homogenization, which constitute more than 70 pct of all the secondary phases present in the microstructure of AA7020 aluminum alloys. The dominant GB phase is identified to be Al 17 (Fe 3.2 Mn 0.8 )Si 2 . In the present research, a comprehensive study on the effect of the homogenization treatment on the evolution of the GB phases during homogenization was conducted. The analysis shows that the evolution of this phase is largely dependent on temperature, which ranges from spheroidization with insignificant dissolution at low temperatures to full dissolution during homogenization at high temperatures. A new mechanism for the dissolution of these phases called thinning, discontinuation, and full dissolution (TDFD) is proposed based on the findings of the field emission gun-scanning electron microscope (FEG-SEM) analysis.

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Section: B Mechanisms Of the Evolution Of The Gb Phases During Homogmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evolution of Grain Boundary Phases during the Homogenization of AA7020 Aluminum Alloy

Eivani

Ahmed

Zhou

et al. 2009

Metall Mater Trans A

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“…A continuous decrease of connectivity with homogenization time has been also observed for a 6005 Al-alloy [20]. Spheroidization and in particular, necklace formation, has been considered a key process for increased extrudability [18,19]. It appears that the index exhibiting the more consistent variation with homogenization time is the circularity index, which, as stated above, exhibits a continuous reduction with homogenization time.…”

Section: Resultsmentioning

confidence: 57%

Metallographic Index-Based Quantification of the Homogenization State in Extrudable Aluminum Alloys

Sarafoglou

Aristeidakis

Tzini

et al. 2016

Metals

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Extrudability of aluminum alloys of the 6xxx series is highly dependent on the microstructure of the homogenized billets. It is therefore very important to characterize quantitatively the state of homogenization of the as-cast billets. The quantification of the homogenization state was based on the measurement of specific microstructural indices, which describe the size and shape of the intermetallics and indicate the state of homogenization. The indices evaluated were the following: aspect ratio (AR), which is the ratio of the maximum to the minimum diameter of the particles, feret (F), which is the maximum caliper length, and circularity (C), which is a measure of how closely a particle resembles a circle in a 2D metallographic section. The method included extensive metallographic work and the measurement of a large number of particles, including a statistical analysis, in order to investigate the effect of homogenization time. Among the indices examined, the circularity index exhibited the most consistent variation with homogenization time. The lowest value of the circularity index coincided with the metallographic observation for necklace formation. Shorter homogenization times resulted in intermediate homogenization stages involving rounding of edges or particle pinching. The results indicated that the index-based quantification of the homogenization state could provide a credible method for the selection of homogenization process parameters towards enhanced extrudability.

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“…They focused on the evolution of the microstructure, low melting point phases and the M, T, S, Al 3 Mg 2 (b), β, Al 18 Cr 2 Mg (E) and CrAl 7 phases. Fan et al [28] studied the evolution of microstructure in an Al-Zn-Mg-Cu alloy during homogenization. Ciach et.…”

Section: Previous Work On Homogenization Treatment Of Aluminum Alloysmentioning

confidence: 99%

Microstructural Evolution During the Homogenization of Al-Zn-Mg Aluminum Alloys

Eivani¹,

Zhou²,

Duszczyk³

2011

Recent Trends in Processing and Degradation of Aluminium Alloys

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The microstructural evolution of an Al–Zn–Mg–Cu alloy during homogenization

Cited by 181 publications

References 12 publications

Evolution of Grain Boundary Phases during the Homogenization of AA7020 Aluminum Alloy

Evolution of Grain Boundary Phases during the Homogenization of AA7020 Aluminum Alloy

Metallographic Index-Based Quantification of the Homogenization State in Extrudable Aluminum Alloys

Microstructural Evolution During the Homogenization of Al-Zn-Mg Aluminum Alloys

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