A new way to cast high-alloyed Al–Zn–Mg–Cu–Zr for super-high strength and toughness

Dong, Jingbo; Chen, Jianzhong; Yu, Faquan; Zhao, Zhipeng; Zhuo, Yimin

doi:10.1016/j.jmatprotec.2005.07.010

Cited by 60 publications

(19 citation statements)

References 14 publications

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“…Increasing the additions of Zn and Mg will enhance the volume fraction of precipitates and improve the mechanical properties [10]. However, a large amount of Zn and Mg results in coarse grains and segregation in ingots and results in poor ductility and low fracture strength [11]. Moreover, the 7XXX alloys with high Zn and Mg content were easy to failure in service.…”

Section: Introductionmentioning

confidence: 99%

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: 99%

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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show abstract

“…High-strength Al-Zn-Mg-Cu alloys of the 7xxx series are very important light-weight structure materials and widely used in the military and aerospace industries [1]. Knowledge of the fracture characteristics of these alloys is an important factor in application under failure-safe design [2], taking into account that the fracture toughness in aluminum alloys is one of the main obstacles to using these materials in widespread ways [3].…”

Section: Introductionmentioning

confidence: 99%

Notch fracture toughness of high-strength Al alloys

Vratnica¹,

Pluvinage²,

Jodin³

et al. 2013

Materials & Design

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“…This matter is due to the influence of the primary chemical composition on freezing range, grain size, fraction of eutectic phase and segregation. As a result, it is imperative to control and refine the microstructure including grain size and interparticle distance of secondary phases in order not only to minimize the segregation and all concomitant problems but also to improve the strength and ductility of the alloy [3,4]. One aspect to accomplish this goal is through an appropriate extrusion process of a fully homogenized Al-Zn-Cu-Mg alloy with minimum segregation.…”

Section: Introductionmentioning

confidence: 99%

The effect of Al−5Ti−1B on the microstructure, hardness and tensile properties of a new Zn rich aluminium alloy

Ebrahimi¹,

Aghazadeh²,

Dehghani³

et al. 2015

Materials Science and Engineering: A

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A new way to cast high-alloyed Al–Zn–Mg–Cu–Zr for super-high strength and toughness

Cited by 60 publications

References 14 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

Notch fracture toughness of high-strength Al alloys

The effect of Al−5Ti−1B on the microstructure, hardness and tensile properties of a new Zn rich aluminium alloy

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