Mesoscopic structure control of spray formed high strength Al–Zn–Mg–Cu alloys

Sharma, Mala M.; Amateau, M.F.; Eden, Timothy J.

doi:10.1016/j.actamat.2005.03.007

Cited by 96 publications

(27 citation statements)

References 9 publications

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“…Thus, it is thought that the spray deposition technique could be used to enhance the mechanical properties of aluminum alloys. The additions of Mg and Zn enhanced the mechanical properties because of the η'-MgZn 2 precipitates after the aging treatment [17,18]. The addition of other alloying elements were also effective to enhance the properties.…”

Section: Introductionmentioning

confidence: 90%

Hot Deformation Behavior of a Spray-Deposited Al-8.31Zn-2.07Mg-2.46Cu-0.12Zr Alloy

Sheng

Lei

Xiao

et al. 2017

Metals

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Abstract:Metallic materials have a significant number of applications, among which Al alloys have drawn people's attention due to their low density and high strength. High-strength Al-based alloys, such as 7XXX Al alloys, contain many alloying elements and with high concentration, whose microstructures present casting voids, segregation, dendrites, etc. In this work, a spray deposition method was employed to fabricate an Al-8.31Zn-2.07Mg-2.46Cu-0.12Zr (wt %) alloy with fine structure. The hot deformation behavior of the studied alloy was investigated using a Gleeble 1500 thermal simulator and electron microscopes. The microstructure evolution, variation in the properties, and precipitation behavior were systematically investigated to explore a short process producing an alloy with high property values. The results revealed that the MgZn 2 particles were detected from inside the grain and grain boundary, while some Al 3 Zr particles were inside the grain. An Arrhenius equation was employed to describe the relationship between the flow stress and the strain rate, and the established constitutive equation was that: Figure 7 gives the hardness variations of the hot compressed samples aged at 120 • C fo durations. For the samples after being hot-compressed at strain rates of 1 s −1 and 0.001 s −1 , present the same trend. The initial hardness of compressed samples increased with the hot de temperature. The hardness of the hot-compressed samples increased with the aging time, a kept constant as they were aging at certain temperatures for 15 h.Metals 2017, 7, 299 deformation temperature. The hardness of the hot-compressed samples increased with the and almost kept constant as they were aging at certain temperatures for 15 h. Discussion Constitutive EquationThe constitutive relationships were used to describe the hot deformation behavior. Som are employed to reveal the hot deformation behavior, in which one of the most extended v the hot working constitutive equation is as follows [24]:where ε is the strain rate; A is a material constant which is independent of temperature true stress; Q is the activation energy; R is the gas constant (8.31); and T is the absolute tem (K). At low stress lever (ασ < 0.8):At high stress lever (ασ > 1.2):(σ) σ n F  , β and n are the material constants, α = β/n. Substituting Equations (2) and (3) (4) and (5), respectively, gives:The values of n and β are from the slopes of the lines in ln ε and σ, lnε and ln σ , Discussion Constitutive EquationThe constitutive relationships were used to describe the hot deformation behavior. Som are employed to reveal the hot deformation behavior, in which one of the most extended v the hot working constitutive equation is as follows [24]:where .ε is the strain rate; A is a material constant which is independent of temperature; σ is stress; Q is the activation energy; R is the gas constant (8.31); and T is the absolute tempera At low stress lever (ασ < 0.8):At high stress lever (ασ > 1.2): F(σ) = σ n , β and n are the material constants, α = β/n. Substit...

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Section: Introductionmentioning

confidence: 90%

Hot Deformation Behavior of a Spray-Deposited Al-8.31Zn-2.07Mg-2.46Cu-0.12Zr Alloy

Sheng

Lei

Xiao

et al. 2017

Metals

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“…The spray metal forming process successfully reduces the oxide content substantially, and thereby increases ductility ( Ref 4,5). As a result of this and other apparent benefits, the spray forming process has received considerable attention as an alternative method for the synthesis of a variety of structural materials (Ref 6), and has been used for this study.…”

Section: Introductionmentioning

confidence: 99%

Processing and Composition Effects on the Fracture Behavior of Spray-Formed 7XXX Series Al Alloys

Sharma

Ziemian

Eden

2010

J. of Materi Eng and Perform

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The fracture properties of high-strength spray-formed Al alloys were investigated, with consideration of the effects of elemental additions such as zinc, manganese, and chromium and the influence of the addition of SiC particulate. Fracture resistance values between 13.6 and 25.6 MPa (m) 1/2 were obtained for the monolithic alloys in the T6 and T7 conditions, respectively. The alloys with SiC particulate compared well and achieved fracture resistance values between 18.7 and 25.6 MPa (m) 1/2 . The spray-formed materials exhibited a loss in fracture resistance (K I ) compared to ingot metallurgy 7075 alloys but had an improved performance compared to high-solute powder metallurgy alloys of similar composition. Characterization of the fracture surfaces indicated a predominantly intergranular decohesion, possibly facilitated by the presence of incoherent particles at the grain boundary regions and by the large strength differential between the matrix and precipitate zone. It is believed that at the slip band-grain boundary intersection, particularly in the presence of large dispersoids and/or inclusions, microvoid nucleation would be significantly enhanced. Differences in fracture surfaces between the alloys in the T6 and T7 condition were observed and are attributed to inhomogeneous slip distribution, which results in strain localization at grain boundaries. The best overall combination of fracture resistance properties were obtained for alloys with minimum amounts of chromium and manganese additions.

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“…The coherency strain in the MgZn-Al alloy is calculated using the value of int and the quasicrystal phase particle morphologies (Table 2), which are measured by microstructure observation and except for coarse-particle of more than 1 mm. The estimated values of " int in the Mg-Zn-Al alloys and the reported values in the other alloys 27,28,36,37) are listed in Table 4. The coherency strain of the quasicrystal phase particle is smaller than that of the other particles.…”

Section: )mentioning

confidence: 99%

“…When the interface between the matrix and particle has coherency, the interface strengthening, int , is considered, which is given by; 27,28) …”

Section: Effect Of Quasicrystal Phase Particle Dispersion On Mechanicmentioning

confidence: 99%

Effect of Quasicrystal Phase Particle Dispersion on Mechanical Properties in Mg-Zn-Al Alloys

et al. 2011

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Four kinds of Mg-x mass%Zn-y mass%Al (x ¼ 6, 8, 10, 12 and y ¼ 3, 4, 5, 6) alloys, each with a grain size of 2$3 mm and containing quasicrystal phase particles, were successfully produced by casting and extrusion. These rare-earth free wrought processed magnesium alloys showed a reduction in mechanical asymmetry and a weak basal texture. Although the yield strength improved, the elongation decreased with increasing volume fraction of quasicrystal phase particle. The decrease in ductility was related to the existence of coarse quasicrystal phase particles. The strength was affected by the interface strength mechanism; however, the coherency strain in the quasicrystal phase was smaller than that in the conventional phase, due to the strong matching between the matrix and the quasicrystal phase.

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Mesoscopic structure control of spray formed high strength Al–Zn–Mg–Cu alloys

Cited by 96 publications

References 9 publications

Hot Deformation Behavior of a Spray-Deposited Al-8.31Zn-2.07Mg-2.46Cu-0.12Zr Alloy

Hot Deformation Behavior of a Spray-Deposited Al-8.31Zn-2.07Mg-2.46Cu-0.12Zr Alloy

Processing and Composition Effects on the Fracture Behavior of Spray-Formed 7XXX Series Al Alloys

Effect of Quasicrystal Phase Particle Dispersion on Mechanical Properties in Mg-Zn-Al Alloys

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