Modeling of dynamic microstructure evolution of EN AW-6082 alloy during hot forward extrusion

Parvizian, Farhad; Güzel, Ahmet; Jäger, Andreas; Lambers, H.-G.; Svendsen, Bob; Tekkaya, A. Erman; Maier, Hans Jürgen

doi:10.1016/j.commatsci.2010.12.009

Cited by 12 publications

(4 citation statements)

References 13 publications

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“…16f) remained the same as that in the initial material. It is important to note that for the AA6082 aluminum alloy during the extrusion process, most grains become elongated in the metal flow direction, as found by Güzel et al (2012) and Parvizian et al (2011), and DRX only occurs locally where the thermomechanical condition permits DRX. Oosterkamp et al (2004) revealed that the solid-state welding process, including the weld seam formation during extrusion, entails complex mechanisms.…”

Section: Microstructure Evolution Inside the Welding Chambermentioning

confidence: 93%

Analysis of the bonding strength and microstructure of AA6082 extrusion weld seams formed during physical simulation

Bai

Fang

Zhou

2017

Journal of Materials Processing Technology

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The research was aimed to determine the effects of extrusion process condition on the weld seam quality of the aluminum alloy AA6082 by using a novel physical simulation method. A weld seam between two bars was formed under hydrostatic pressure in a specially designed die setup to simulate the longitudinal weld seam formation during extrusion through porthole die. With this die setup, extrusion process variables, i.e., temperature, extrusion speed and strain, could be varied so that their individual effects on weld seam quality could be discriminated. With the help of finite element (FE) simulation, the distributions of strains, strain rates and hydrostatic pressures inside the welding chamber were quantified. Tension tests were performed to evaluate the bonding strengths of solidstate welded samples. It was found that the amount of deformation imposed inside the welding chamber had a dominant effect on the bonding strength. A high deformation temperature and a high extrusion speed enhanced the bonding strength. The microstructures across the weld zone were examined by using a polarized light microscope and electron back-scatter diffraction (EBSD). The microstructure evolutions inside and around the welding zone were found to be influenced by the

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Section: Microstructure Evolution Inside the Welding Chambermentioning

confidence: 93%

Analysis of the bonding strength and microstructure of AA6082 extrusion weld seams formed during physical simulation

Bai

Fang

Zhou

2017

Journal of Materials Processing Technology

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“…Moreover, they suggested that as deformation continues, highangle grain boundaries (HABs) are eventually generated after the misorientation of the subgrain boundaries reaches a critical value, thus further forming new recrystallized grains. Parvizian et al 13 established a model for the dynamic evolution of microstructures during the thermal deformation of 6082 aluminum alloy. They used EBSD to measure the grains and subgrain structures after thermal deformation of 6082 aluminum alloy and revealed the thermal deformation mechanism of 6082 aluminum alloy based on geometrically dynamic recrystallization.…”

Section: Introductionmentioning

confidence: 99%

Dynamic recrystallization behavior of 6082 aluminum alloy during hot deformation

Hua

2021

Advances in Mechanical Engineering

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The dynamic recrystallization behaviors of 6082 aluminum alloy in the temperature range of 623–773 K and strain rate range of 0.01–5 s−1 were studied by electron back scattered diffraction (EBSD) and transmission electron microscopy (TEM). According to the experimental results, dynamic recrystallization occurs during hot deformation of 6082 aluminum alloy, although the true stress-strain curve has no obvious single peak characteristic, and the degree of dynamic recrystallization is closely related to the Z parameter. Hot compression with lnZ = 24.9014 (723 K, 0.1 s−1) gives rise to the highest recrystallization fraction of 38.6%. The initial critical strain of dynamic recrystallization was determined by the work hardening rate. The quantitative relationship between the critical strain and Z parameters was established: [Formula: see text]. Based on the EBSD analysis and measurement results, dynamic recrystallization kinetics models of 6082 aluminum alloy during hot deformation were deduced. Microstructure analysis showed that the subgrain structure formed in the original grain is coarsened by grain boundary migration, and the orientation difference increases continuously until a large-angle grain boundary forms, resulting in dynamic recrystallization of grains. The likely mechanism is continuous dynamic recrystallization.

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“…Moreover, they suggested that as deformation develops, the high-angle grain boundary (HAB) is eventually generated after the misalignment of the subgrain boundary reaches a critical value, thus further forming new recrystallized grains. Parvizian et al [13] established a model for the dynamic evolution of microstructures during thermal deformation of the 6082 Al alloy. Using EBSD technology, they measured the grain and subgrain structures after thermal deformation of the 6082 Al alloy and revealed the mechanism of thermal deformation of the 6082 Al alloy based on dynamic recrystallization and allied geometric changes.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Recrystallization Behavior and Processing Map of the 6082 Aluminum Alloy

Dao-chun

Wang

2020

Materials

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Multiple hot-compression tests were carried out on the 6082 aluminum (Al) alloy using a Gleeble-1500 thermal simulation testing machine. Data on flow stresses of the 6082 Al alloy at deformation temperatures of 623 to 773 K and strain rates from 0.01 to 5 s−1 were attained. Utilizing electron backscatter diffraction (EBSD) and a transmission electron microscope (TEM), the dynamic recrystallization behaviors of the 6082 Al alloy during hot compression in isothermal conditions were explored. With the test data, a hot-working processing map for the 6082 Al alloy (based on dynamic material modeling (DMM)) was drawn. Using the work-hardening rate, the initial critical strain causing dynamic recrystallization was determined, and an equation for the critical strain was constructed. A dynamic model for the dynamic recrystallization of the 6082 Al alloy was established using analyses and test results from the EBSD. The results showed that the safe processing zone (with a high efficiency of power dissipation) mainly corresponded to a zone with deformation temperatures of 703 to 763 K and strain rates of 0.1 to 0.3 s−1. The alloy was mainly subjected to continuous dynamic recrystallization in the formation of the zone. According to the hot-working processing map and an analysis of the microstructures, it is advised that the following technological parameters be selected for the 6082 Al alloy during hot-forming: a range of temperatures between 713 and 753 K and strain rates between 0.1 and 0.2 s−1.

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Modeling of dynamic microstructure evolution of EN AW-6082 alloy during hot forward extrusion

Cited by 12 publications

References 13 publications

Analysis of the bonding strength and microstructure of AA6082 extrusion weld seams formed during physical simulation

Analysis of the bonding strength and microstructure of AA6082 extrusion weld seams formed during physical simulation

Dynamic recrystallization behavior of 6082 aluminum alloy during hot deformation

Dynamic Recrystallization Behavior and Processing Map of the 6082 Aluminum Alloy

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