Deformation behavior and microstructure evolution of 7050 aluminum alloy during high temperature deformation

Hu, Hengshan; Zhen, Liang; Li, Yang; Shao, Wen‐Zhu; Zhang, B.Y.

doi:10.1016/j.msea.2007.10.051

Cited by 148 publications

(75 citation statements)

References 22 publications

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“…In contrast to Q,ˇwas higher for powder compacts with lower relative green densities. The values obtained for the hot deformation activation energy were in good agreement with those previously reported for 7xxx series aluminium alloys [3,6,21,28,29]. Eq.…”

Section: Constitutive Analysissupporting

confidence: 91%

“…The hot deformation behaviour of bulk aluminium alloys has been the subject of many studies [3,6,7,[14][15][16][19][20][21]. Nevertheless, the deformation behaviour of porous materials is different which leads to after-consolidation mechanical properties that cannot be attained through the conventional processing of cast and wrought alloys with similar chemical compositions [8].…”

Section: Introductionmentioning

confidence: 99%

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Hot deformation behaviour and flow stress prediction of 7075 aluminium alloy powder compacts during compression at elevated temperatures

Taleghani

Ruiz-Navas

Salehi

et al. 2012

Materials Science and Engineering: A

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Abstract:In the present study, the hot deformation behaviour of 7075 aluminium alloy powder compacts was studied by performing hot compression tests on a Gleeble 3800 machine. The main objectives were to evaluate the effect of the relative green density on the hot deformation behaviour and to model and predict the hot deformation flow stress of powder compacts using constitutive equations. For this pur-pose, powder compacts with relative green densities ranging from 83 to 95%, which were prepared by uniaxial cold pressing a commercial pre-mixed powder, were hot compressed at temperatures ranging from 350 • Cto450 • C and at true strain rates ranging from 0.01 s −1 to 10 s −1 . The true stress-true strain curves of the powder compacts exhibited a peak stress at a critical strain after which the flow stress remained nearly constant. As the deformation temperature increased or the strain rate and green density decreased, a decrease in the peak stress level was observed. The relationship between deformation tem-perature, strain rate, and the peak flow stress of powder compacts was described by the Zener-Hollomon parameter in an exponential equation containing relative green density compensated material constants and the deformation activation energy. The peak flow stresses calculated from the proposed formula were in good agreement with the experimental results, which confirms the applicability of the employed method for the prediction of the hot deformation flow stress of porous materials with different relative green densities.

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Section: Constitutive Analysissupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Hot deformation behaviour and flow stress prediction of 7075 aluminium alloy powder compacts during compression at elevated temperatures

Taleghani

Ruiz-Navas

Salehi

et al. 2012

Materials Science and Engineering: A

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“…So the small size grains in Figures 5b and 10b are subgrains in nature. Similar research results have also been reported in our previous studies [23,31,32].…”

Section: In-plane Anisotropy Of the Over-aged 7050 Aluminum Alloysupporting

confidence: 93%

“…So the small size grains in Figures 5b and 10b are subgrains in nature. Similar research results have also been reported in our previous studies [23,31,32]. During plastic deformation of the over-aged 7050 aluminum alloy, dislocations bow around, but do not cut through, the precipitates with big size and high hardness.…”

Section: In-plane Anisotropy Of the Over-aged 7050 Aluminum Alloysupporting

confidence: 91%

Effect of Heat Treatment on the In-Plane Anisotropy of As-Rolled 7050 Aluminum Alloy

Wang

2016

Metals

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Abstract:Tensile tests were conducted on both as-quenched and over-aged 7050 aluminum alloy to investigate the effect of heat treatment on the in-plane anisotropy of as-rolled 7050 aluminum alloy. The results showed that the tensile direction has limited effect on mechanical properties of the as-quenched 7050 aluminum alloy. The in-plane anisotropy factors (IPA factor) of tensile strength, yield strength, and elongation in as-rolled 7050 aluminum alloy fluctuate in the vicinity of 5%. The anisotropy of the as-quenched 7050 aluminum alloy is mainly affected by the texture according to single crystal analysis based on the Schmid factor method. Besides, the IPA factor of the elongation in the over-aged 7050 aluminum alloy reaches 11.6%, illustrating that the anisotropy of the over-aged 7050 aluminum alloy is more prominent than that of the as-quenched. The occurrence of the anisotropy in the over-aged 7050 aluminum alloy is mainly attributed to the microstructures. which are characterized by visible precipitate free zones (PFZs) and coarse precipitates in (sub)grain boundaries.

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“…In hot deformation, the dependence of flow stress on the strain rate and temperature can be expressed as follows (Ref 16,23): For the purpose of determining the constitutive model for / (r), three key parameters (n, b, a) need to be obtained, respectively. For the low stress level and high stress level, the / (r) in Eq 1 is substituted by power law and exponential law, respectively.…”

Section: Constitutive Equationmentioning

confidence: 99%

Constitutive Equation and Processing Map for Hot Deformation of SiC Particles Reinforced Metal Matrix Composites

Zhang

Wan

2010

J. of Materi Eng and Perform

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Flow behavior and microstructures of Al/15% SiCp were investigated by hot compression tests using Gleeble-1500 thermomechanical simulator at temperatures ranging from 440 to 500°C with strain rates of 0.001-1.0 s 21 . The high-temperature deformation behaviors of Al/15% SiCp were analyzed based on the true stress-true strain curves. The results show that the softening mechanism at low strain rate (0.001 s 21 ) is dynamic recovery, and at high strain rates (0.01, 0.1, and 1 s 21 ) is dynamic recrystallization (DRX). Based on these experimental data, a set of constitutive equations for Al/15% SiCp are described by the Zener-Hollomon parameter, and the coefficients of equations are found to be functions of strain. The constitutive equations reveal the dependence of flow stress on strains, strain rates, and temperatures. Furthermore, the mean error between the experimental and the calculated flow stress was computed. The result shows that the calculated results from constitutive equations are in good agreement with the experimental results. To demonstrate the potential workability of Al/15% SiCp, the processing map was established. The stable zones and the instability zones in processing map are identified and verified through micrographs. As a result, the optimum strain rates and temperatures for effective hot working of Al/15% SiCp were determined.

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Deformation behavior and microstructure evolution of 7050 aluminum alloy during high temperature deformation

Cited by 148 publications

References 22 publications

Hot deformation behaviour and flow stress prediction of 7075 aluminium alloy powder compacts during compression at elevated temperatures

Hot deformation behaviour and flow stress prediction of 7075 aluminium alloy powder compacts during compression at elevated temperatures

Effect of Heat Treatment on the In-Plane Anisotropy of As-Rolled 7050 Aluminum Alloy

Constitutive Equation and Processing Map for Hot Deformation of SiC Particles Reinforced Metal Matrix Composites

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