[Kovove materialy - Metallic materials]
    Sat - June 23, 2018 - 17:59 No. of hits : 937922 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 55 (2017), Issue 6

Phase transitions in selected Al-Pd-Co alloys during continuous cooling
CERNICKOVA, I., ĎURIŠKA, L., DRIENOVSKÝ, M., JANIČKOVIČ, D., JANOVEC, J.
vol. 55 (2017), no. 6, pp. 403 - 411

Abstract
The continuous cooling from 1300 °C to ambient temperature by a differential thermal analyser was used to estimate the non-equilibrium evolution of phases in alloys Al67Pd14.6Co18.4, Al76Pd11Co13, Al71.7Pd14.4Co13.9, and Al67.4Pd20.6Co12. To compare non-equilibrium and near-equilibrium microstructures, the same alloys were also annealed at 850 °C for 500 h. Besides the differential thermal analysis, the X-ray diffraction, the scanning electron microscopy including energy dispersive X-ray spectroscopy, and the Vickers microhardness test were used in the investigation. Various combinations of phases β, U, δ, εn, F, Al5Co2, and Al9Co2 were identified in the alloys; there was no difference between continuously cooled and as-annealed conditions in the phase occurrence. The alloys, as sequenced above, were considered to solidify through phases β + V (concurrently), F, V, and β, respectively. Temperature ranges of solidification were also estimated. Based on the experimental results and other available data, the sequences of non-equilibrium phase transitions were proposed for several alloys of the still less-known Al-Pd-Co system.

Key words
Al-Pd-Co, continuous cooling, phase characterisation, differential thermal analysis, phase evolution

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.


Article abstracts updated: 2018-06-14 09:46      
Articles in press revised: 2017-11-14 12:19     
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