Temporal evolution of the nanostructure of Al(Sc,Zr) alloys: Part I – Chemical compositions of Al(ScZr) precipitates

Fuller, Christian B.; Murray, J. L.; Seidman, David N.

doi:10.1016/j.actamat.2005.08.016

Cited by 271 publications

(94 citation statements)

References 28 publications

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“…In contrast, Sc achieved 3 at.% solid-solubility in the A^Zr compound [116,117]. A further study using atom-probe tomography [118] showed that the maximum Zr concentration within A^Sci^Zr,) precipitates was only 1.5 ± 0.2 at.% after a 576 h soak at 300 °C, which was much lower than the values in previous reports.…”

Section: Ahcscijzr) Phasecontrasting

confidence: 46%

“…The addition of the slow diffusing element Zr, which is soluble in AI3SC, has the potential to increase the coarsening resistance of AI3SC precipitates and thus improve the thermal stability of the matrix during prolonged exposure at elevated temperatures [118,183]. Moreover, it is reported that Ti is also a candidate as a ternary alloying element to the Al-Sc alloy for stabilizing the precipitate structure and improving the coarsening resistance [183].…”

Section: Discussionmentioning

confidence: 99%

“…Raju et al [119] and Yu et al [120] independently observed cubic morphologies of A^Sci-jZr*) precipitates. By means of high-resolution electron microscopy, Fuller et al proposed a faceted structure whose facets were parallel to the (100) and (110) Recent studies revealed that A^Sci^Zr*) crystals consisted of a AI3SC core surrounded by a Zr-rich shell [118,121,122]. The calculated diffusivity of Sc and Zr using Equations 2.12 and 2.13 [123][124][125] demonstrates that Zr diffuses four orders of magnitude slower than Sc in Al at 300 °C [11,72].…”

Section: Ahcscijzr) Phasementioning

confidence: 99%

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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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Section: Ahcscijzr) Phasecontrasting

confidence: 46%

Section: Discussionmentioning

confidence: 99%

Section: Ahcscijzr) Phasementioning

confidence: 99%

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

Lai¹

2011

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“…These dispersoids may also significantly enhance the work hardening effect [17]. Dispersoids generally increase the YS and the ultimate tensile strength (UTS) by more than 50% [14,[17][18][19][20][21]. However, conventional fusion welding of Al-Mg-Sc-Zr alloys leads to the dissolution of these unique precipitates and a corresponding degradation in the material strength [11,22,23].…”

Section: Introductionmentioning

confidence: 99%

Friction-stir welding of an Al–Mg–Sc–Zr alloy in as-fabricated and work-hardened conditions

Malopheyev

Kulitskiy

Mironov

et al. 2014

Materials Science and Engineering: A

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. b s t r a c tThe effect of prior work hardening on the microstructure and mechanical properties of a friction-stir welded (FSWed) Al-5.4Mg-0.2Sc-0.1Zr alloy was investigated. The microstructure of the final stir zone was shown to be weakly dependent on the initial condition of the base material; FSW led to the formation of fully recrystallized microstructures with average grain sizes ranging from 1.2 to 1.5 μm and a moderate dislocation density of $ 3.57 1.5 Â 10 13 m À 2 in the stir zone. The nano-scale Al 3 (Sc,Zr) dispersoids coarsened from 9 to $ 15 nm but retained a coherent relationship with the matrix. In contrast, the joint efficiency of the obtained welds was very sensitive to the initial material condition. Nearly full strength joints were obtained in both annealed (O) and partially hardened and stabilized (H323) conditions. However, the joint efficiency was only 65% in the fully hardened condition (H18). The relatively low weld strength for the alloy in the H18 condition was attributed to the elimination of dislocation and substructure strengthening during FSW.

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“…The combination of transmission electron microscopy (TEM) and atom probe tomography (APT) enables researchers to relate the atomic structure and composition of nanoscale features of interest and has been gaining influence over the past decades. Typically, correlative TEM/APT analyses have been carried out from distinct specimens from the same alloy, [1][2][3][4][5][6][7] which fails in cases where the microstructure is inhomogeneous and/or when targeting rare microstructural features for both TEM and APT investigations. As recently reviewed by Herbig,8 full electron microscopy characterization of specific features can be carried out on needle-shaped specimens prior to APT analysis by utilizing specially designed holders.…”

Section: Introductionmentioning

confidence: 99%

Correlative Microscopy—Novel Methods and Their Applications to Explore 3D Chemistry and Structure of Nanoscale Lattice Defects: A Case Study in Superalloys

Makineni

Lenz

Kontis

et al. 2018

JOM

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Temporal evolution of the nanostructure of Al(Sc,Zr) alloys: Part I – Chemical compositions of Al(ScZr) precipitates

Cited by 271 publications

References 28 publications

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

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

Friction-stir welding of an Al–Mg–Sc–Zr alloy in as-fabricated and work-hardened conditions

Correlative Microscopy—Novel Methods and Their Applications to Explore 3D Chemistry and Structure of Nanoscale Lattice Defects: A Case Study in Superalloys

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