High Temperature Deformation of Twin-Roll  Cast Al-Mn-Based Alloys after Equal Channel  Angular Pressing

Málek, P.; Šlapáková, Michaela; Cieslar, Miroslav

doi:10.3390/ma8115401

Cited by 5 publications

(4 citation statements)

References 29 publications

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“…This is the case of the Al3003 alloy used in our research. Experiments performed on the 3003 aluminium alloy processed by ECAP [25] revealed that the sample after four ECAP passes contained a mixture of elongated grains containing numerous LAGBs and small equiaxed grains with the average size close to 500 nm. The ratio of HAGBs was close to 60%.…”

Section: Discussionmentioning

confidence: 99%

The Role of Mandrel Rotation during CSET Processing Demonstrated on a 3003 Aluminium Alloy

Molnárová

Habr

Čapek

et al. 2022

Metals

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Recently, the complex shearing of extruded tube (CSET) technique was proposed representing a new way of processing tubes from a bulk billet as a combination of extrusion with two passes of equal channel angular processing and possible mandrel rotation. In the present paper, the influence of mandrel rotation on the final microstructure and mechanical properties of the tube fabricated of a 3003 aluminium alloy was investigated. Electron back scatter diffraction (EBSD) revealed differences in grain size and misorientation angles between tubes processed with stationary and rotating mandrel. Kernel average misorientation maps obtained from EBSD experiments and ASTAR analysis performed in transmission electron microscopy proved differences in the dislocation density and arrangement. The tube processed using a stationary mandrel showed a recovered microstructure with elongated grains separated by low-angle grain boundaries into subgrains. The microstructure of the tube processed with a rotating mandrel was dynamically recrystallized with the grain size in submicrometer range. Vickers microhardness measurements revealed only a 40% HV increase in the sample prepared using stationary mandrel as compared with the initial billet. The mandrel rotation resulted in a much higher HV increase up to 200% as a result of substantial grain refinement.

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Section: Discussionmentioning

confidence: 99%

The Role of Mandrel Rotation during CSET Processing Demonstrated on a 3003 Aluminium Alloy

Molnárová

Habr

Čapek

et al. 2022

Metals

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“…Owing to their grain size sensitivity, the superplastic properties can be significantly improved by optimization of thermomechanical treatments [30,31] (including severe plastic deformation [32][33][34]) and chemical composition modification. Both methods focus on a grain refinement effect.…”

Section: Introductionmentioning

confidence: 99%

High Strain Rate Superplasticity in Al-Zn-Mg-Based Alloy: Microstructural Design, Deformation Behavior, and Modeling

et al. 2020

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Increasing the strain rate at superplastic forming is a challenging technical and economic task of aluminum forming manufacturing. New aluminum sheets exhibiting high strain rate superplasticity at strain rates above 0.01 s−1 are required. This study describes the microstructure and the superplasticity properties of a new high-strength Al-Zn-Mg-based alloy processed by a simple thermomechanical treatment including hot and cold rolling. The new alloy contains Ni to form Al3Ni coarse particles and minor additions of Zr (0.19 wt.%) and Sc (0.06 wt.%) to form nanoprecipitates of the L12-Al3 (Sc,Zr) phase. The design of chemical and phase compositions of the alloy provides superplasticity with an elongation of 600–800% in a strain rate range of 0.01 to 0.6/s and residual cavitation less than 2%. A mean elongation-to-failure of 400% is observed at an extremely high constant strain rate of 1 s−1. The strain-induced evolution of the grain and dislocation structures as well as the L12 precipitates at superplastic deformation is studied. The dynamic recrystallization at superplastic deformation is confirmed. The superplastic flow behavior of the proposed alloy is modeled via a mathematical Arrhenius-type constitutive model and an artificial neural network model. Both models exhibit good predictability at low and high strain rates of superplastic deformation.

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“…To date, a number of studies have been done to investigate the ECAP processes of pure aluminum and high purity aluminum in both experiments and simulations, amongst which some factors such as extrusion route, extrusion passes, and die angles were studied more frequently [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. For general materials, the initial condition of the material is usually neglected due to less obvious particularity.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution in High Purity Aluminum Single Crystal Processed by Equal Channel Angular Pressing (ECAP)

Dong

Dai

et al. 2017

Materials

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Aluminum single crystal with 99.999% purity was deformed at room temperature by equal channel angular pressing (ECAP) up to 16 passes. Grain size and misorientation of processed samples were quantitatively characterized by TEM and EBSD. The results show that the refinement efficiency of high purity aluminum single crystal was poor in the initial stage. Extrusion by fewer ECAP passes (n ≤ 8) resulted in only elongated grains containing a large number of subgrains and small misorientations between grains. Stable microstructures of nearly equiaxed grains with high misorientations were obtained by 15 passages, indicating that the initial extremely coarse grains and highly uniform grain orientation are not conducive to the accumulation of strain energy. The initial state of high purity aluminum has a significant effect on the refining efficiency of the ECAP process.

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High Temperature Deformation of Twin-Roll Cast Al-Mn-Based Alloys after Equal Channel Angular Pressing

Cited by 5 publications

References 29 publications

The Role of Mandrel Rotation during CSET Processing Demonstrated on a 3003 Aluminium Alloy

The Role of Mandrel Rotation during CSET Processing Demonstrated on a 3003 Aluminium Alloy

High Strain Rate Superplasticity in Al-Zn-Mg-Based Alloy: Microstructural Design, Deformation Behavior, and Modeling

Microstructure Evolution in High Purity Aluminum Single Crystal Processed by Equal Channel Angular Pressing (ECAP)

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