A study of coarsening, recrystallization, and morphology of microstructure in Al-Sc-(Zr)-(Mg) alloys

Riddle, Yancy W.; Sanders, T. H.

doi:10.1007/s11661-004-0135-3

Cited by 117 publications

(49 citation statements)

References 17 publications

(23 reference statements)

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“…The resulting misfit at the relevant annealing temperatures 773-823 K yields a calculated critical radius between 23-26 nm for Al 3 Sc [using Eq. (B3)], agreeing well with our experimentally observed range of 20-30 nm and the previously reported values [48,[50][51][52][53][54][55]. The critical particle size is found to increase with temperature, a trend consistent with the Al/Al 3 Sc lattice misfit which decreases with temperature.…”

Section: A Correlation Of Experimental Diffusion Trends and Precipitsupporting

confidence: 90%

Precipitate-induced nonlinearities of diffusion along grain boundaries in Al-based alloys

Gupta

Kulitcki

Kavakbasi

et al. 2018

Phys. Rev. Materials

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The formation of precipitates in metallic alloys is determined by a two-way chemomechanical coupling. While the dependence on solute diffusion is apparent, the opposite effect, namely the impact of nanoprecipitates on the diffusion, is highlighted in the present paper. Using severe plastic deformation and post-deformation annealing of an Al-based alloy, different microstructures and sizes of Al 3 Sc-based nanoprecipitates are produced. The enhanced diffusion along grain boundaries in the so-called C-type kinetic regime is used as a probe to ensure a well-defined distance of the diffusion path from the precipitates and to prohibit their evolution during measurements. Tracer measurements with the radioisotope 57 Co reveal a remarkable nonmonotonic dependence of the diffusion rates on the annealing temperature. It has been fully explained by an ab initio informed phenomenological model that considers the elastic stress around the coherent and noncoherent precipitates.

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Section: A Correlation Of Experimental Diffusion Trends and Precipitsupporting

confidence: 90%

Precipitate-induced nonlinearities of diffusion along grain boundaries in Al-based alloys

Gupta

Kulitcki

Kavakbasi

et al. 2018

Phys. Rev. Materials

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“…Al-Sc systems in terms of decreasing the coarsening rate [72,107], increasing the strength and the recrystallization resistance [23,113,114].…”

Section: Al-sc-zr Ternary Alloysmentioning

confidence: 99%

“…was described to be spherical [113,116]. Raju et al [119] and Yu et al [120] independently observed cubic morphologies of A^Sci-jZr*) precipitates.…”

Section: Ahcscijzr) Phasementioning

confidence: 99%

Developing Sc and Zr containing Al-B C metal matrix composites for high temperature applications /

Lai¹

2011

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RESUMEDans cette étude, nous nous intéressons principalement au développement de la coulée, et au durcissement structrural des composites à matrice métallique AI-B4C pour des applications à haute temperature. Le scandium et le zirconium ont été introduits dans le système AI-B4C, comme éléments d'alliage, et leurs effets sur la microstrcture, la réponse au vieillissement, les propriétés mécaniques et la stabilité thermique ont été étudiés.Afin de réaliser cette étude, un microscope optique, un microscope électronique à balayage et un microscope électronique à transmission ont été utilisés dans le but d'observer la microstructure de brut de coulée et celle obtenue après vieillissement, d'analyser les réactions interfaciales, la distribution des éléments d'alliage entre l'interface et la matrice ainsi que pour examiner l'évolution des précipités lors de la couleé et le vieillissement.La réponse au vieillissement et le durcissement structural de la matrice ont été suivis par des mesures de dureté 'Vickers'. Les propriétés mécaniques et la stabilité thermique à long terme des composites contenant Se et Zr ont été évaluées en utilisant des essais de dureté Vickers et Rockwell ainsi que des essais de compression.Dans le premier chapitre de cette étude, des plaques de B4C ont été immergées dans l'aluminium liquide contenant Se, Zr et Ti afin d'étudier les réactions interfaciales entre le B4C et l'aluminium liquide. Les effets de Se, Zr et Ti à l'interface en terme d'apports individuels et combinés ont été examinés. Les résultats montrent que les trois éléments réagissent avec B4C et forment des couches interfaciales, qui agissent comme des barrières de diffusion, dans le but de limiter la décomposition du B4C dans l'aluminium liquide. Ainsi, les réactions interfaciales et les produits de réaction dans chaque système ont été identifiés. En combinant le Se, Zr et Ti, une grande quantité de Ti est enrichie à l'interface, qui non seulement offre une protection appropriée au B4C mais aussi une réduction de la consomation de Se et Zr à l'interface.Dans le second chapitre, le scandium et le zirconium ont été introduits dans le composite Al-15vol.% B4C, présaturé par Ti et huit composites à diférents teneurs en Se et Zr ont été préparés par couleé conventionelle. Il a été constaté que le scandium favorise les réactions interfaciales avec B4C qui consomme partiellement le Se. L'ajout de Se procure un durcissement structural considerable dans les conditions de couleé conventionnelle et du pic de veiellissement. Afin d'obtenir un durcissement equivalent de Se dans les alliages binaires, environ le double de la quantité de Se est nécessaire pour les composites AI-B4C. Par contre, aucun produit de réaction majeur de Zr n'a été trouvé aux interfaces. En effet, la majeure partie de Zr se concentre dans la matrice pour le durcissenent structurale. La combinaison de Se et Zr augmente de manière significative le durcissement structural. Deux types de précipités nanométriques, AI3SC et Al3(Sc, Zr), ont été observés dans la 11 microstructu...

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“…In recent years, many scientific publications, including foreign ones, have been devoted to research in the field of creating such alloys and studying the properties of products made from them using thermal deformation technologies [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. The relevance of these studies is also emphasized by the fact that research work was carried out with the financial support of the Government of the Russian Federation.…”

Section: Introductionmentioning

confidence: 99%

Physical Modeling Technological Regimes of Production Deformed Semi-Finished Products from Experimental Aluminium Alloys Alloyed by Scandium

Баранов

Sidelnikov

Zenkin

et al. 2018

MSF

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2«RUSAL Bratsk Aluminum Smelter» JSC, 665710, Bratsk, BrAS, 1, Russia a sbs270359@yandex.ru Keywords: aluminum alloys of the Al-Mg system, scandium, rolling, extruding, sheet semi-finished products, welding wire, mechanical properties, corrosion resistance.Abstract. The combination of weldability, corrosion resistance and sufficient strength make it possible to use deformed semi-finished products from the Al-Mg system alloys for sheathing ships' hulls, in car, aircraft and rocket construction, as well as in other areas of industry. To increase the strength characteristics, it is promising to alloy them with small additives of metals such as titanium, zirconium, scandium, and others. In this paper, studies were carried out to obtain deformed semi-finished products (strips, rods and wires) from aluminum alloys in which the scandium content varied from 0.1 to 0.25%. For this purpose, various metal treatment conditions simulated in the laboratory of School of Non-Ferrous Metals and Material Science in Siberian federal university. For the preparation of sheet semi-finished products regimes of hot and cold rolling of a cast billet simulated from a thickness of 40 mm to a thickness of 3 mm. For the preparation of sheet semi-finished products, the modes of hot and cold rolling of the cast billet from a thickness of 40 mm to a thickness of 1-3 mm have been modeled. To produce a welding wire with a size of 2×2 mm, a combined casting and rolling-extruding (CCRE) process was simulated to produce a 9 mm billet and its further rolling in square gauges. Rods with a diameter of 9 mm were produced on a combined processing unit, and wire on a rolling mill with a roll diameter of 130 mm. In accordance with the research program, the mechanical properties of hot-deformed, colddeformed and annealed sheet semi-finished products were measured. Then the semi-finished products were welded together with the obtained wire and the quality and properties of the welded joint and their corrosion resistance were evaluated. Research results are currently used to develop industrial technologies for the production of sheets and plates from experimental alloys of the AlMg system doped with scandium.

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A study of coarsening, recrystallization, and morphology of microstructure in Al-Sc-(Zr)-(Mg) alloys

Cited by 117 publications

References 17 publications

Precipitate-induced nonlinearities of diffusion along grain boundaries in Al-based alloys

Precipitate-induced nonlinearities of diffusion along grain boundaries in Al-based alloys

Developing Sc and Zr containing Al-B C metal matrix composites for high temperature applications /

Physical Modeling Technological Regimes of Production Deformed Semi-Finished Products from Experimental Aluminium Alloys Alloyed by Scandium

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