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Tungsten Heavy Alloys from Mixed Feedstock by RF Plasma
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SYSNO ASEP 0581973 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Tungsten Heavy Alloys from Mixed Feedstock by RF Plasma Author(s) Kovarik, O. (CZ)
Čížek, Jan (UFP-V) ORCID
Klečka, Jakub (UFP-V) ORCID
Karlík, M. (CZ)
Čech, J. (CZ)
Kozlík, J. (CZ)
Lauschmann, H. (CZ)Number of authors 7 Source Title Journal of Thermal Spray Technology. - : Springer - ISSN 1059-9630
Roč. 32, č. 8 (2023), s. 2747-2762Number of pages 16 s. Language eng - English Country DE - Germany Keywords additive manufacturing ; fatigue crack growth rate ; fracture toughness ; inert atmosphere ; stress-strain Subject RIV JG - Metallurgy OECD category Materials engineering R&D Projects EF16_019/0000778 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA19-14339S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support UFP-V - RVO:61389021 UT WOS 001060052200001 EID SCOPUS 85168860965 DOI 10.1007/s11666-023-01647-6 Annotation Tungsten heavy alloys (WHA) are particulate composites of spherical W particles embedded in a ductile Ni-rich matrix. In our study, pre-treated W and Ni feedstock powders were used to prepare three different compositions (all wt.%) for spraying: W-10Ni, W-20Ni for two different WHA, and W-65Ni for a matrix-only material without the reinforcing W particles. Using radio frequency inductively coupled plasma spraying (RF-ICP) method, low porosity deposits were obtained with ductility exceeding 5%. By a detailed study of the microstructure and the particle-matrix interfaces, the mechanism of the composite formation was identified: a rapid dissolution of W in the liquid Ni and a subsequent W particle solidification followed by the solidification of the matrix. The mechanical properties of the composites are defined by the Ni-rich matrix (tough and significantly stronger than pure Ni) with well bonded stiff W particles. The elastic behavior was related to the W content following the Reuss model, describing a layered composite modulus in a serial configuration. Contrary to this, in the plastic regime, all WHA exhibited nearly identical behavior regardless of the W content. In this regime, the deformation of the W particles reached several percent, indicating an extremely strong particle-matrix bonding. Last, the failure mechanisms of the materials were investigated, with the matrix behavior governing the fatigue failure, and particle-matrix decohesion dominating in the static loading at higher loads. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2024 Electronic address https://link.springer.com/article/10.1007/s11666-023-01647-6
Number of the records: 1