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Creep deformation of Co-Re-Ta-C alloys with varying C content-investigated in-situ by simultaneous synchrotron radiation diffraction
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SYSNO ASEP 0489159 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Creep deformation of Co-Re-Ta-C alloys with varying C content-investigated in-situ by simultaneous synchrotron radiation diffraction Author(s) Karge, L. (DE)
Gilles, R. (DE)
Mukherji, D. (DE)
Stark, A. (DE)
Beran, Přemysl (UJF-V) RID, ORCID, SAI
Schell, N. (DE)
Hofmann, M. (DE)
Strunz, Pavel (UJF-V) RID, ORCID, SAI
Hausler, J. (DE)
Rösler, J. (DE)Number of authors 10 Source Title Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. - : Elsevier - ISSN 0921-5093
Roč. 719, č. 3 (2018), s. 124-131Number of pages 8 s. Publication form Print - P Language eng - English Country CH - Switzerland Keywords high temperature creep ; Co alloys ; synchrotron diffraction ; neutron diffraction ; dilatometer Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) Institutional support UJF-V - RVO:61389005 UT WOS 000429390300013 EID SCOPUS 85041923596 DOI 10.1016/j.msea.2018.02.009 Annotation The creep deformation of precipitation hardened Co-Re-Ta-C alloys is investigated during in-situ synchrotron diffraction experiment at 1373 K. At room temperature, the alloys have a structure consisting of epsilon-Co (hcp) and metastably retained gamma-Co (fcc) and are strengthened by precipitates of the mono-carbide of Ta, which are finely dispersed in the alloy matrix. The alloy exhibits an allotropic epsilon -> gamma-Co phase transformation when heating to >1173 K. A lower C content in the alloy generally promotes this transformation. It is shown that this transformation is strongly influenced by application of compressive load. The transformation epsilon -> gamma-Co at high temperature under load leads to microstructure refinement and subsequently to dissolution of hardening precipitates. This results in a considerable acceleration of the creep rate. Further, the equilibrium ratio of gamma/epsilon-Co phase is significantly altered under compressive load. This behavior is attributed to a volume relaxation as the epsilon- and gamma-Co phase have different unit cell volumes. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2019
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