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Journal of Materials Engineering and Performance

Erschienen in:

01.10.2013

Phase Evolution and Thermal Analysis of Nanocrystalline AlCrCuFeNiZn High Entropy Alloy Produced by Mechanical Alloying

verfasst von: N. T. B. N. Koundinya, C. Sajith Babu, K. Sivaprasad, P. Susila, N. Kishore Babu, J. Baburao

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 10/2013

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Abstract

A multi-component nanocrystalline AlCrCuFeNiZn high entropy alloy with 12 nm crystallite size was successfully synthesized using high energy ball milling. The progress of solid solution formation during milling was analyzed using XRD. A major portion of the HEA is observed to be BCC in crystal structure after 30 h of milling. Thermal analysis showed that HEA powders exhibited exponential oxidation characteristics. Thermal analysis showed that low activation energy was sufficient to start recrystallization because of high energy stored in the milled powders. The crystallite size after consolidation is in nanocrystalline range due to the sluggish diffusion of atoms and nanotwinning. After consolidation, the crystallite size is around 79 nm. Samples sintered at 850 °C for 2 h exhibited high hardness values of 700 ± 15 HV_1.0, major volume fraction of the phases are having FCC crystal structure along with a minor phase having BCC crystal structure. Due to positive enthalpy mixing of Cu with other elements, decomposition of BCC to new FCC phases occurs.

Vorheriger Artikel Characterization of Isothermally Heat-Treated High Carbon Nanobainitic Steels

Nächster Artikel An Insight into Lüders Deformation Using Advanced Imaging Techniques

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Titel: Phase Evolution and Thermal Analysis of Nanocrystalline AlCrCuFeNiZn High Entropy Alloy Produced by Mechanical Alloying
verfasst von: N. T. B. N. Koundinya
C. Sajith Babu
K. Sivaprasad
P. Susila
N. Kishore Babu
J. Baburao
Publikationsdatum: 01.10.2013
Verlag: Springer US
Erschienen in: Journal of Materials Engineering and Performance / Ausgabe 10/2013
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-013-0580-5

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