Hot deformation and processing map of a typical Al–Zn–Mg–Cu alloy

Lin, Y.C.; Li, Leiting; Xia, Yi; Jiang, Yu-Qiang

doi:10.1016/j.jallcom.2012.10.114

Cited by 241 publications

(72 citation statements)

References 41 publications

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“…Therefore, a higher temperature and a lower strain are beneficial for a microstructure transition, such as dynamic recovery and recrystallization, during hot deformation, which can enlarge the value of η [35]. On the contrary, a lower temperature and a higher strain rate usually lead to flow instabilities because of the formation of adiabatic shear bands, dynamic strain aging, mechanical twining, and flow rotations [36]. Therefore, the instability domain is found in the upper-left corner of the maps, which is 850-870 • C and 10 −1.3 -10 −0.2 s −1 for the as-cast state and 850-865 • C and 10 −1.3 -10 −0.3 s −1 for the homogenized state.…”

Section: ε)mentioning

confidence: 99%

Hot Deformation Behavior of As-Cast and Homogenized Al0.5CoCrFeNi High Entropy Alloys

Wang

Niu

et al. 2016

Metals

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Abstract:The hot deformation behavior of as-cast and homogenized Al 0.5 CoCrFeNi high entropy alloys (HEAs) during isothermal compression was investigated as a function of temperature and strain rate. Results indicated that flow stress in a homogenized state was always higher than that in an as-cast state under the same deformation conditions. Moreover, the optimum thermo-mechanical processing (TMP) conditions for the hot working of the homogenized state were identified as 945-965 • C and 10 −1.7 -10 −1.1 s −1 and were easier to determine in practice. Constitutive equations, for both states, correlating the flow stress of Al 0.5 CoCrFeNi with strain rate and deformation temperature were also determined.

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Section: ε)mentioning

confidence: 99%

Hot Deformation Behavior of As-Cast and Homogenized Al0.5CoCrFeNi High Entropy Alloys

Wang

Niu

et al. 2016

Metals

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“…[8], can be used to analyze and simulate the deformation behaviors of materials during the hot working process in the FEM. For hot forging of the P/M Fe-Cu-C alloy with a relative density of 0.8 in a closed die, with a forging velocity of 250 mm/s, an initial preform temperature of 1373 K (1100°C), and a preheated model temperature of 573 K (300°C), the whole 3-D-FEMs of the connecting rod preforms are effectively generated.…”

Section: Fem Simulation Resultsmentioning

confidence: 99%

“…Inspection of the available literature demonstrates that the finite element method (FEM) [2][3][4] used for mechanical behavior simulation and the hot-pressing map [5][6][7][8][9] is critical in the design analysis process. Liao et al studied the hot deformation behaviors of Al-Si-Mg alloys by hot compressive tests using a Gleebe-3500 thermal simulator.…”

Section: Introductionmentioning

confidence: 99%

Deformation Behavior of Powder Metallurgy Connecting Rod Preform During Hot Forging Based on Hot Compression and Finite Element Method Simulation

Eckert

2017

Metall Mater Trans A

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Powder-forged connecting rod with a complex geometry shape always has a problem with nonuniform density distribution. Moreover, the physical property of preform plays a critical role for optimizing the connecting rod quality. The flow behavior of a Fe-3Cu-0.5C (wt pct) alloy with a relative density of 0.8 manufactured by powder metallurgy (P/M, Fe-Cu-C) was studied using isothermal compression tests. The material constitutive equation, power dissipation (g) maps, and hot processing maps of the P/M Fe-Cu-C alloy were established. Then, the hot forging process of the connecting rod preforms was simulated using the material constitutive model based on finite element method simulation. The calculated results agree well with the experimental ones. The results show that the flow stress increases with decreasing temperature and increasing strain rate. The activation energy of the P/M Fe-Cu-C alloy with a relative density of 0.8 is 188.42 kJ/mol. The optimum temperature at the strain of 0.4 for good hot workability of sintered Fe-Cu-C alloy ranges from 1333 K to 1380 K (1060°C to 1107°C). The relative density of the hot-forged connecting rod at the central part changed significantly compared with that at the big end and that at the small end. These present theoretical and experimental investigations can provide a methodology for accurately predicting the densification behavior of the P/M connecting rod preform during hot forging, and they help to optimize the processing parameters.

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“…So the total energy P absorbed by the object can be determined as two complementary functions: G and J [21][22][23].…”

Section: Processing Mapsmentioning

confidence: 99%

Characterization of Hot Deformation Behavior of a Novel Al–Cu–Li Alloy Using Processing Maps

Yiran

Yin

et al. 2015

Acta Metall. Sin. (Engl. Lett.)

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The isothermally compression deformation behavior of an elevated Cu/Li weight ratio Al-Cu-Li alloy was investigated under various deformation conditions. The isothermal compression tests were carried out in a temperature range from 300 to 500°C and at a strain rate range from 0.001 to 10 s -1 . The results show that the peak stress level decreases with temperature increasing and strain rate decreasing, which is represented by the Zener-Hollomon parameter Z in the hyperbolic sine equation with the hot deformation activation energy of 218.5 kJ/mol. At low Z value, the dynamic recrystallized grain is well formed with clean high-angle boundaries. At high Z value, a high dislocation density with poorly developed cellularity and considerable fine dynamic precipitates are observed. Based on the experimental data and dynamic material model, the processing maps at strain of 0.3, 0.5 and 0.7 were developed to demonstrate the hot workability of the alloy. The results show that the main softening mechanism at high Z value is precipitate coarsening and dynamic recovery; the dynamic recrystallization of the alloy can be easily observed as ln Z B 29.44, with peak efficiency of power dissipation of around 70%. At strains of 0.3, 0.5 and 0.7, the flow instability domains are found at higher strain rates, which mainly locate at the upper part of processing maps. In addition, when the strain rate is 0.001 or 0.02 s -1 , there is a particular instability domain at 300-350°C.

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Hot deformation and processing map of a typical Al–Zn–Mg–Cu alloy

Cited by 241 publications

References 41 publications

Hot Deformation Behavior of As-Cast and Homogenized Al0.5CoCrFeNi High Entropy Alloys

Hot Deformation Behavior of As-Cast and Homogenized Al0.5CoCrFeNi High Entropy Alloys

Deformation Behavior of Powder Metallurgy Connecting Rod Preform During Hot Forging Based on Hot Compression and Finite Element Method Simulation

Characterization of Hot Deformation Behavior of a Novel Al–Cu–Li Alloy Using Processing Maps

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