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Study of Pt-Al-Nb alloys above 45 at.% Pt
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SYSNO ASEP 0538942 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Study of Pt-Al-Nb alloys above 45 at.% Pt Author(s) Ndlovu, G. F. (ZA)
Ukabhai, K. D. (ZA)
Nape, K. T. (ZA)
Samal, Sneha Manjaree (FZU-D) ORCID, RID
Wookey, G. (ZA)
Douglas, A. (ZA)
Julies, B. A. (ZA)
Joja, B. (ZA)
Cornish, L. A. (ZA)Number of authors 9 Source Title Journal of Phase Equilibria and Diffusion. - : Springer - ISSN 1547-7037
Roč. 41, č. 4 (2020), s. 391-417Number of pages 27 s. Language eng - English Country US - United States Keywords experimental phase equilibria ; liquidus surface ; phase diagram ; platinum ; ternary phase diagram Subject RIV JG - Metallurgy OECD category Materials engineering Method of publishing Limited access Institutional support FZU-D - RVO:68378271 UT WOS 000528982000001 EID SCOPUS 85084152096 DOI 10.1007/s11669-020-00798-1 Annotation Pt-Al-Nb alloys were made by arc melting and studied in both the as-cast condition and after annealing at 1000 C for 1000 h, using scanning electron microscopy with energy dispersive x-ray analysis, and x-ray diffraction. A modified electro-etching method was used to etch as-cast alloys which gave much clearer microstructures, by helping to remove the Al oxide scale on the surface. One ternary phase was found, Nb47.8Pt50.3Al1.9 (at.%). A solidification projection, liquidus projection surface and 1000 C isothermal section were derived. The extensions into the ternary on solidification were: *Nb2Pt: * 20 at.% Al, *NbPt2: * 5 at.% Al, bNbPt3: * 4 at.% Al, *PtAl: * 2 at.% Nb, *Pt5Al3: * 5 at.% Nb, *Pt3Al: * 10 at.% Nb and b: * 30 at.% Nb. Ten invariant reactions were found on the liquidus surface. The samples were annealed at 1000 C for 1000 h under air, and while some alloys showed phases with little reduction in extension, some alloys had oxidised to form (Pt) and the oxides of aluminium and niobium.
Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2021 Electronic address https://doi.org/10.1007/s11669-020-00798-1
Number of the records: 1