Microstructure and deformation behaviour of the ECAP Al-Mn-Sc-Zr alloy

MALEK, P.; Cieslar, Miroslav

doi:10.4149/km_2014_6_329

Cited by 4 publications

(5 citation statements)

References 17 publications

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“…However, after four ECAP passes the microstructure still contains numerous low-angle boundaries (about 60%) [ 13 ]. Similar results were also obtained in the direct chill cast (DC) Al-Mn-Zr-Sc alloy where not fully recrystallized microstructure was observed even after eight ECAP passes [ 18 ]. Recovery and recrystallization processes during ECAP are retarded in the studied Al-Mn-based alloys.…”

Section: Discussionsupporting

confidence: 78%

“…The ductility and parameter m values measured at 400 °C are within the experimental error identical with those found in the ECAP Al-Mn-Zr-Sc alloy prepared by direct chill casting [ 18 ]. A principal difference between the TRC material without Sc and conventional materials with Sc is observed at higher deformation temperatures.…”

Section: Discussionsupporting

confidence: 73%

“…Some special applications of Al-Mn alloys connected with deep drawing of thicker blanks require good and uniform formability of the material approaching the superplastic flow. Such behavior was found in an ingot cast Al-Mn-Sc-Zr alloy after SPD [ 18 ]. A small amount of Sc was added into the alloy in order to form a fine dispersion of Al 3 Sc and Al 3 (Sc,Zr) precipitates.…”

Section: Introductionmentioning

confidence: 65%

“…A principal difference between the TRC material without Sc and conventional materials with Sc is observed at higher deformation temperatures. A higher content of Zr (0.23 wt.%) and addition of Sc (0.27 wt.%) result in a significant enhancement of retarding forces for grain boundary migration, preservation of fine-grained microstructure, and retaining of “superplastic like” deformation behavior up to 500 °C in the Al-Mn-Zr-Sc alloy [ 18 ].…”

Section: Discussionmentioning

confidence: 99%

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

2015

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Twin roll cast Al-Mn- and Al-Mn-Zr-based alloys were subjected to four passes of equal channel angular pressing. The resulting grain size of 400 nm contributes to a significant strengthening at room temperature. This microstructure is not fully stable at elevated temperatures and recrystallization and vast grain growth occur at temperatures between 350 and 450 °C. The onset of these microstructure changes depends on chemical and phase composition. Better stability is observed in the Al-Mn-Zr-based alloy. High temperature tensile tests reveal that equal channel angular pressing results in a softening of all studied materials at high temperatures. This can be explained by an active role of grain boundaries in the deformation process. The maximum values of ductility and strain rate sensitivity parameter m found in the Al-Mn-Zr-based alloy are below the bottom limit of superplasticity (155%, m = 0.25). However, some features typical for superplastic behavior were observed—the strain rate dependence of the parameter m, the strengthening with increasing grain size, and the fracture by diffuse necking. Grain boundary sliding is believed to contribute partially to the overall strain in specimens where the grain size remained in the microcrystalline range.

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Section: Discussionsupporting

confidence: 78%

Section: Discussionsupporting

confidence: 73%

Section: Introductionmentioning

confidence: 65%

Section: Discussionmentioning

confidence: 99%

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

2015

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“…The ratio of HAGBs was close to 60%. The increase of the number of ECAP passes to eight did not change the microstructure significantly, a relatively high ratio of LAGBs was still present [26].…”

Section: Discussionmentioning

confidence: 85%

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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Deformation and fatigue behaviour of additively manufactured Scalmalloy® with bimodal microstructure

Schimbäck

Kaserer

Mair

et al. 2023

International Journal of Fatigue

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Microstructure and deformation behaviour of the ECAP Al-Mn-Sc-Zr alloy

Cited by 4 publications

References 17 publications

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

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

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

Deformation and fatigue behaviour of additively manufactured Scalmalloy® with bimodal microstructure

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