Characterization of hot deformation behavior and constitutive modeling of Al–Mg–Si–Mn–Cr alloy

Liu, Shuhui; Pan, Qing‐Jiang; Li, Hang; Huang, Zaiwang; Li, Kuo; He, Xiangming; Li, Xinyu

doi:10.1007/s10853-018-3116-4

Cited by 56 publications

(9 citation statements)

References 38 publications

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“…It is known that there are different constitutive models proposed to describe the flow behavior and determine the material constants during hot deformation, including the activation energy and strain-rate sensitivity. The Arrhenius equations are usually used to accurately describe the relationship between the strain rate, deformation temperatures, and flow stress as follows [20,21] :…”

Section: Constitutive Equations For Materials Constants and Z Parametersmentioning

confidence: 99%

Constitutive Behavior of an AA4032 Piston Alloy with Cu and Er Additions upon High-Temperature Compressive Deformation

Chankitmunkong

Eskin

Limmaneevichitr

2019

Metall Mater Trans A

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Aluminum piston alloys of the AA4032 type are produced by direct-chill (DC) casting and subsequent forging; therefore, it is important to understand their thermomechanical behavior. In recent years, it was shown that additions of Cu and Er could improve mechanical properties of these alloys at room and high temperatures. In this work, we studied the constitutive behavior of AA4032-type alloys with and without Cu and Er additions. The experimental true stress-true strain curves were obtained by compression tests under various temperatures [683 K to 723 K (410°C to 450°C)] and strain rates (0.01 to 10 s À1) to determine constitutive parameters [strain-rate sensitivity, activation energy, and Zener-Hollomon (Z) parameter] for the hot deformation behavior of AA4032-type piston alloys with and without additions of Cu and Er. The flow stress decreased with increasing deformation temperature and decreasing strain rate. The results also showed that increasing the Cu content increased the flow stress over the applied range of deformation conditions due to solid-solution strengthening and the formation of primary Si particles, which led to an increase in the activation energy during hot deformation. Moreover, the main microstructural damage in the AA4032 alloy with 3.5 pct Cu was predominantly due to the cracking of primary Si particles. Additions of 0.4 pct Er and 3.5 pct Cu lower the activation energy of deformation, Q, as compared to the base alloy and the alloy with 3.5 pct Cu. The microstructures in the deformed specimens consisted of subgrains, recrystallized grains, and fine eutectic phases. The alloys containing Er demonstrated more polygonized grains at a low strain rate than the alloys without Er, indicating that Er hindered recrystallization development. The peak stress of the AA4032 alloy with 3.5 pct Cu alloy was higher than for the base AA4032 alloy and for the AA4032 alloy with 3.5 pct Cu and 0.4 pct Er additions, which was attributed to the prevalence of the work-hardening mechanism over the softening mechanism.

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Section: Constitutive Equations For Materials Constants and Z Parametersmentioning

confidence: 99%

Constitutive Behavior of an AA4032 Piston Alloy with Cu and Er Additions upon High-Temperature Compressive Deformation

Chankitmunkong

Eskin

Limmaneevichitr

2019

Metall Mater Trans A

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“…erefore, thermoviscoplastic analysis of U71Mn rail steel is a prerequisite for studying gouging in U71Mn rails [24]. Owing to its simple form and clearly defined parameters, the Johnson-Cook constitutive model is often used to describe the thermoviscoplastic behavior of materials [25][26][27]. Quasistatic compression and Hopkinson bar experiments were performed to determine the mechanical properties of U71Mn rail steel.…”

Section: Investigation Of the Thermoviscoplastic Properties Of U71mn ...mentioning

confidence: 99%

Mechanistic Study of Rail Gouging during Hypersonic Rocket Sled Tests

Zhou

Yan

Chen

et al. 2022

Advances in Materials Science and Engineering

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Gouging—an obstacle to the development of hypersonic rocket sled test techniques—was mechanistically investigated through experimental and theoretical analyses. Typical gouges were analyzed using macroscopic and microscopic experiments to investigate the evolution of gouging. Quasistatic compression and Hopkinson bar experiments were performed to systematically study the thermoviscoplastic properties of U71Mn rail steel under wide ranges of the strain rate and temperature. The critical condition for gouging was derived based on a thermoviscoplastic constitutive model supplemented by a three-variable criterion for an adiabatic shear instability. The results showed the following. (1) Adiabatic shear bands (ASBs) form when stress reduction under the combined action of frictional heating and high-speed deformation exceeds the strain-hardening effect of the rail material. (2) The nonuniform deformation of the edges of ASBs leads to the generation of cracks that split the rail surface. As the ASBs expand, the cracks grow and coalesce, eventually causing the material to peel off, forming gouges. (3) The relationships among the temperature, strain rate, and strain at the onset of gouging can be determined based on the critical condition for the formation of ASBs in rail steel.

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“…Activation energy is reported to be sensitive to the composition of alloys, reflecting the workability of alloys [39]. The comparison of the activation energies Q of CoCr-FeMnNi-based alloys is summarized in Table 2.…”

Section: Activation Energy (Q)mentioning

confidence: 99%

Hot Deformation Behavior and Hardness of a CoCrFeMnNi High-Entropy Alloy with High Content of Carbon

Wang

Xin

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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A CoCrFeMnNi high-entropy alloy with a high content of carbon was synthesized, and its hot deformation behavior was studied at the temperatures 800-1000 °C at the strain rates ranging from 0.001 to 0.1 s −1. As-prepared alloy is a face-centered cubic-structured solid solution, with a large amount of carbides residing at grain boundaries. True stress-strain curves were employed to develop the constitutive equation of apparent activation energy. The apparent activation energy (Q) was found to be 423 kJ mol −1 , indicating a dynamic flow softening behavior. The size of dynamic recrystallized (DRXed) grains increases with increasing the temperature or decreasing the strain rate. A processing map was sketched on the basis of the flow stress. The temperature range of 900-1000 °C and 10 −3-10 −2.6 s −1 strain rate were found to be the optimum hot-forging parameter. With increasing temperature or decreasing strain rate, the volume fraction of fine carbides (≤ 1 μm) increases. A lot of coarse carbides can be found in the matrix after deformation at 800 °C, which leads to a high hardness value of 345 HV. The carbides after deformation at 1000 °C are mainly nano-sized M 7 C 3 and M 23 C 6 , which can promote the nucleation of DRX.

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Characterization of hot deformation behavior and constitutive modeling of Al–Mg–Si–Mn–Cr alloy

Cited by 56 publications

References 38 publications

Constitutive Behavior of an AA4032 Piston Alloy with Cu and Er Additions upon High-Temperature Compressive Deformation

Constitutive Behavior of an AA4032 Piston Alloy with Cu and Er Additions upon High-Temperature Compressive Deformation

Mechanistic Study of Rail Gouging during Hypersonic Rocket Sled Tests

Hot Deformation Behavior and Hardness of a CoCrFeMnNi High-Entropy Alloy with High Content of Carbon

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