Influence of cooling rate after homogenization on the flow behavior of aluminum alloy 7050 under hot compression

Liu, Shengdan; You, Jingbi; Zhang, Xinming; Deng, Yunlai; Yuan, Yubao

doi:10.1016/j.msea.2009.10.055

Cited by 59 publications

(19 citation statements)

References 16 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%

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%

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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show abstract

“…The hot deformation activation energy derived from Arrhenius plots of ln sinh(˛ ) versus 1/T shown in Fig. 2(b) is 160.3 kJ/mol for the studied alloy, which is lower than that of the solid solution treated 7050 aluminum alloy (256.6 kJ/mol) reported by Hu [13], but close to the value of the furnace-cooled 7050 aluminum alloy after homogenization of 465 • C/24 h + 475 • C/4 h deformed at the true strain of 0.7 (170 kJ/mol) reported by Liu [12]. It shows that the values of the deformation activation energy are sensitive to the initial microstructures in the same alloy.…”

Section: Kinetic Analysissupporting

confidence: 57%

“…It is generally accepted to use the empirical function including activation energy to express hot working behavior of alloys [5,[10][11][12].…”

Section: Kinetic Analysismentioning

confidence: 99%

Hot deformation behavior and microstructural evolution of homogenized 7050 aluminum alloy during compression at elevated temperature

Deng

Yin

Huang

2011

Materials Science and Engineering: A

145

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“…And the desirable hot workability affected by the microstructure characteristics was another main reason for the extensive application of this typical high-strength aluminum alloy, and the strength can be enhanced through the appropriate thermo-mechanical processing [2]. Thus, the hot deformations parameters applied in the thermo-mechanical processing should be optimized to obtain not only the required shape but also the desired microstructure and properties which were more important [3]. Consequently, the investigation of the deformation behavior and the flow behavior at elevated temperatures were necessary and it was beneficial to the investigation of the hot deformation process for the 7050 aluminum alloy.…”

Section: Introductionmentioning

confidence: 99%

Flow behavior modeling of the 7050 aluminum alloy at elevated temperatures considering the compensation of strain

Cai

et al. 2012

Materials & Design

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Influence of cooling rate after homogenization on the flow behavior of aluminum alloy 7050 under hot compression

Cited by 59 publications

References 16 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

Hot deformation behavior and microstructural evolution of homogenized 7050 aluminum alloy during compression at elevated temperature

Flow behavior modeling of the 7050 aluminum alloy at elevated temperatures considering the compensation of strain

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