Investigation of phase equilibria in alloys of the Al–Zn–Mg–Cu–Zr–Sc system

Рохлин, Л. Л.; Dobatkina, T. V.; Бочвар, Н. Р.; Lysova, E. V.

doi:10.1016/j.jallcom.2003.08.003

Cited by 115 publications

(42 citation statements)

References 2 publications

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“…[3] It is well known that coarse residual particles (>1 lm) deteriorate the extrudability of these alloys especially when they are located in the GB regions. [4][5][6][7][8][9] Therefore, it is necessary to dissolve these particles in the structure in order to attain high mechanical properties and extrudability.…”

Section: Introductionmentioning

confidence: 99%

“…Although there have been a number of investigations on the homogenization treatments of aluminum alloys in recent years, [10][11][12][13][14][15][16][17][18][19][20] most of the efforts have been focused on the nature and evolution of the Al 2 Mg 3 Zn 3 (T), Al 2 CuMg (S), (CuZnAl) 2 Mg, and MgZn 2 (g) phases [10][11][12][13] and the formation and distribution of dispersoids [14][15][16][17][18][19][20] during homogenization. In addition, in comparison with other aluminum alloys, the information on the 7XXX series aluminum alloys is rather scarce in the literature.…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

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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“…During the solidification of the 7xxx series aluminum alloys containing Mg, Zn and Cu, some intermetallic particles such as Al 6 CuMg 4 , Al 2 Mg 3 Zn 3 , AlCuMg, MgZn 2 , Al 2 Cu and MgZn 2 phases form [5][6][7][8][9]. In addition, mutual solutions of different phases can result in the formation of new particles, for example, mutual solid solution of Al 6 CuMg 4 and Al 2 Mg 3 Zn 3 compounds (T phase), solid solution between AlCuMg and MgZn 2 compounds (M phase), solid solution formed by Al 5 Cu 6 Mg 2 and Mg 2 Zn compounds (Z phase) and between Al 2 CuMg and Al 2 Cu compounds (S phase).…”

Section: Particles Composed Of Al Mg Zn and Cumentioning

confidence: 99%

“…Although there have been a number of investigations on the homogenization treatment of the 7xxx series aluminum alloys in recent years [5][6][7][8][20][21][22][23][24][25][26] [5][6][7][8][9] and the formation and distribution of dispersoids during homogenization [20][21][22][23][24][25][26]. In addition, in comparison with other aluminum alloys, the information on the 7xxx series aluminum alloys is rather scarce in the literature.…”

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 as-cast billets contain several inhomogeneities, such as elemental microsegregation, grain boundary segregation, and formation of low-melting eutectics as well as the formation of iron intermetallics. The presence of intermetallic phases, in particular, which possess sharp edges, can impair the deformability of 6xxx extrudable alloys especially when located in the grain boundary regions [1][2][3][4]. Among the intermetallics the most important are the Fe-bearing intermetallics, α-Al 12 (FeMn) 3 Si and β-Al 5 FeSi, from now on called α-AlFeSi and β-AlFeSi respectively.…”

Section: Introductionmentioning

confidence: 99%

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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Investigation of phase equilibria in alloys of the Al–Zn–Mg–Cu–Zr–Sc system

Cited by 115 publications

References 2 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

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

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

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