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Decreasing the W-Cr solid solution decomposition rate: Theory, modelling and experimental verification
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SYSNO ASEP 0571428 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Decreasing the W-Cr solid solution decomposition rate: Theory, modelling and experimental verification Author(s) Veverka, Jakub (UFP-V) ORCID
Vilémová, Monika (UFP-V) RID, ORCID
Lukáč, František (UFP-V) ORCID
Kądzielawa, A. P. (PL)
Legut, D. (CZ)
Vontorová, J. (CZ)
Kozlík, J. (CZ)
Chráska, Tomáš (UFP-V) RID, ORCIDNumber of authors 8 Article number 154288 Source Title Journal of Nuclear Materials. - : Elsevier - ISSN 0022-3115
Roč. 576, May (2023)Number of pages 10 s. Language eng - English Country NL - Netherlands Keywords Ab-initio modelling ; Decomposition ; Solid solution ; Stabilisation ; Tungsten-chromium alloys OECD category Materials engineering R&D Projects GA20-18392S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support UFP-V - RVO:61389021 UT WOS 000926879300001 EID SCOPUS 85146859751 DOI 10.1016/j.jnucmat.2023.154288 Annotation Tungsten-based alloys are essential materials in the nuclear fusion reactors’ development. Particularly, tungsten-chromium single solid solution is interesting for the combination of a good oxidation behaviour and lack of lower-melting-point phases. The W-Cr system has a miscibility gap though and the solid solution within the particular condition is inherently metastable/unstable and tends to decompose forming a Cr-rich phase. In this study, we have combined computer simulations and experimental work to find additional alloying elements to promote the stability of W-Cr solid solution. The results showed that alloying with Ta may result in lowering the stabilising temperature of the alloy, positively affecting the decomposition rate. Experiments performed on a W-Cr-Ta alloy showed prolonged solid solution lifetime when compared to W-Cr alloy. Formation of the third decomposed phase, enriched in Ta, was observed and changes in the chromium diffusion in the alloy were identified to be the governing factor for slowing down the decomposition. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2024 Electronic address https://www.sciencedirect.com/science/article/pii/S0022311523000582?via%3Dihub
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