Properties and microstructure of twin-roll cast Al-Mg alloy containing Sc and Zr

Cieslar, Miroslav; Bajer, Jan; Zimina, Mariia; Šlapáková, Michaela; Grydin, Olexandr

doi:10.1088/1757-899x/179/1/012012

Cited by 6 publications

(3 citation statements)

References 19 publications

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“…Annealing of the twin-roll cast material for 8 hours at 300 • C leads to precipitation of dense distribution of Al 3 (Sc,Zr) [17]. The optimal conditions for their formation were found in our previous work [16] -the highest increase in the microhardness was observed after annealing at 300 • C; furthermore, the precipitates diameter was smaller than after annealing at 350 or 400 • C which ensures higher pinning force acting against recrystallization.…”

Section: Resultsmentioning

confidence: 78%

The Evolution of Microstructure during Annealing of Al-Mg-Sc-Zr Alloy Deformed by Equal Channel Angular Pressing

et al. 2018

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The Al-Mg-Sc-Zr alloys exhibit reasonable mechanical properties (e.g. corrosion resistance, weldability, superplasticity) for application in many branches of the industry. They owe their strength mainly to coherent particles of Al3Sc or Al3(Sc,Zr) phase which form during heat treatment at 300 • C. The influence of such particles on mechanical behaviour and microstructure evolution was studied on a twin-roll cast alloy which was subjected to deformation by equal channel angular pressing. Three types of processing of the material were compared: (1) only deformation, (2) deformation and heat treatment and (3) heat treatment and deformation. The deformation by equal channel angular pressing caused fragmentation of the original grains into micrometric grains and subgrains regardless of the presence of Al3(Sc,Zr) particles. The subsequent isochronal annealing with heating rate 50 K/50 min led to both softening and hardening of the material, dislocation recovery and recrystallization of the grain structure, the later was similar in all the studied materials

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Section: Resultsmentioning

confidence: 78%

The Evolution of Microstructure during Annealing of Al-Mg-Sc-Zr Alloy Deformed by Equal Channel Angular Pressing

et al. 2018

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“…All materials were subjected to heat treatment at 300 • C in order to form coherent Al 3 (Sc,Zr) particles. More information about formation of these particles and their influence on the behavior of the studied material can be found in [22,23]. After annealing for 8 hours at 300 • C the materials were exposed to a long term annealing at 120 • C during which the precipitation of β-phase Al 3 Mg 2 was monitored.…”

Section: Resultsmentioning

confidence: 99%

Transmission Electron Microscopy Study of Microstructure Evolution of Al-Mg-Sc Alloy after Annealing at 120°

et al. 2018

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The Al-Mg-Sc alloys are used in aerospace and shipbuilding industry due to their good mechanical properties such as corrosion resistance, weldability and possibility for superplastic forming. Addition of Sc with Zr may further lead to enhancement of their performance by precipitation of coherent particles of Al3(Sc,Zr) phase which are known to stabilize the microstructure and hinder the recrystallization. The role of the material processing on the microstructure and mechanical properties evolution was studied by means of transmission electron microscopy, scanning electron microscopy and resistivity measurement. The Al-Mg-Sc-Zr alloy was manufactured by two different manners-conventional casting and twin-roll casting and subjected to deformation by equal-channel angular pressing. The shape and nature of the grains significantly influenced precipitation of β-phase Al3Mg2, which may be detrimental for such kind of materials in the terms of corrosion resistance. The worst properties exhibited the conventionally cast and rolled material with a pancake grain structure where the β-phase particles forms as continuous layer along the (sub)grain boundaries.

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“…Strips of age-hardenable Al-Mg-Si alloys [35,36] and Al-Zn-Mg alloys were successfully manufactured on laboratory scale by means of twin-roll casters [26,36]. First laboratory attempts to prepare 5 mm thick strips from Al-Mg-Sc-Zr alloy by TRC showed a positive effect of Sc and Zr alloying on the stability of deformation structures formed during TRC [37]. Attempts to use TRC for the production of Al-Li based alloys are limited [38] and no such alloy containing Sc has ever been manufactured by TRC.…”

Section: Introductionmentioning

confidence: 99%

New Twin-Roll Cast Al-Li Based Alloys for High-Strength Applications

Grydin

Stolbchenko

Schaper

et al. 2020

Metals

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Al-Li based alloys are attractive materials for the aerospace industry. The twin-roll casting of such materials could provide properties not achievable by conventional direct-chill casting and downstream processing methods due to significantly higher solidification rates. An Al-Li-Cu-Mg-Zr alloy was twin-roll cast with the same alloy containing a small addition of Sc. The microstructure of as-cast materials and the influence of Sc on the behavior of the alloy at elevated temperatures were studied by means of light and electron microscopy and by resistivity measurements. A fine-grained structure was formed during twin-roll casting, but several surface and internal defects were found on the strips, which should be suppressed by a further adjustment of the casting conditions. The addition of Sc had a positive effect on grain size uniformity and microstructure stabilization at elevated temperatures, as shown by the precipitation of a fine dispersion of coherent Sc- and Zr-containing precipitates.

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Properties and microstructure of twin-roll cast Al-Mg alloy containing Sc and Zr

Cited by 6 publications

References 19 publications

The Evolution of Microstructure during Annealing of Al-Mg-Sc-Zr Alloy Deformed by Equal Channel Angular Pressing

The Evolution of Microstructure during Annealing of Al-Mg-Sc-Zr Alloy Deformed by Equal Channel Angular Pressing

Transmission Electron Microscopy Study of Microstructure Evolution of Al-Mg-Sc Alloy after Annealing at 120°

New Twin-Roll Cast Al-Li Based Alloys for High-Strength Applications

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