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Mechanical properties and fatigue crack growth in tungsten deposited by RF-plasma
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SYSNO ASEP 0542721 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Mechanical properties and fatigue crack growth in tungsten deposited by RF-plasma Author(s) Kovařík, O. (CZ)
Čížek, Jan (UFP-V) ORCID
Klečka, Jakub (UFP-V) ORCID
Karlík, M. (CZ)
Čapek, J. (CZ)
Siegl, J. (CZ)
Chráska, Tomáš (UFP-V) RID, ORCID
Takayasu, S. (JP)Number of authors 8 Article number 126930 Source Title Surface and Coatings Technology. - : Elsevier - ISSN 0257-8972
Roč. 410, March (2021)Number of pages 11 s. Language eng - English Country CH - Switzerland Keywords Crack growth rate ; Fracture morphology ; Fracture toughness ; Stress-strain ; Tungsten ; Vacuum plasma spray Subject RIV JP - Industrial Processing 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 000655539400007 EID SCOPUS 85101072841 DOI 10.1016/j.surfcoat.2021.126930 Annotation Fracture toughness and fatigue crack growth rates of free-standing thick W deposits produced in a protective atmosphere using radio frequency inductively-coupled plasma process were investigated. Stress-strain behavior of the deposits was studied using four-point bending and their fracture toughness was estimated from three-point bending following the ASTM E1820 standard. The fatigue crack growth rates were measured in symmetrical bending using a resonance approach. The results were compared with commercially available bulk tungsten prepared by powder metallurgy that served as a reference. The results showed that the deposits had significantly lower stress-strain properties: the elastic modulus and tensile strength ranged from 30% to 50% of the reference bulk values. The crack growth rate tests together with fractographic analysis suggested that a static failure by inter-granular decohesion predetermines the fatigue properties of the deposits and causes high slopes of the corresponding fatigue crack growth rate curves. Contrary to this, the reference sheet failed trans-granularly. The inter-granular failure mode of the deposits was caused by grain boundary embrittlement, a phenomenon probably related to oxides. The lowest obtained oxygen concentration in deposit was nearly by two orders of magnitude higher, than in reference sheet. The distribution of oxygen was studied by TEM and the amorphous and crystalline oxide phases were identified at splat interfaces. The presence of oxygen in the deposits produced by the inherently non-oxidizing RF technology calls for control of oxygen content in the feedstock powder. The performed characterization provided baseline data of mechanical and fatigue properties of RF plasma sprayed tungsten. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2022 Electronic address https://www.sciencedirect.com/science/article/pii/S0257897221001031?via%3Dihub
Number of the records: 1