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Structural evolution in reactive RF magnetron sputtered (Cr,Zr)(2)O-3 coatings during annealing
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering. Sandvik Coromant AB, Sweden.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
Karlsruhe Institute Technology, Germany.
Karlsruhe Institute Technology, Germany.
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2017 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 131, 543-552 p.Article in journal (Refereed) Published
Abstract [en]

Reactive RF-magnetron sputtering is used to grow Cr0.28Zr0.10O0.61 coatings at 500 degrees C. Coatings are annealed at 750 degrees C, 810 degrees C, and 870 degrees C. The microstructure evolution of the pseudobinary oxide compound is characterized through high resolution state of the art HRSTEM and HREDX-maps, revealing the segregation of Cr and Zr on the nm scale. The as-deposited coating comprises cc-(Cr,Zr)(2)O-3 solid solution with a Zr-rich (Zr,Cr)O-x. amorphous phase. After annealing to 750 degrees C tetragonal ZrO2 nucleates and grows from the amorphous phase. The ZrO2 phase is stabilized in its tetragonal structure at these fairly low annealing temperatures, possibly due to the small grain size (below 30 nm). Correlated with the nucleation and growth of the tetragonal-ZrO2 phase is an increase in hardness, with a maximum hardness after annealing to 750 degrees C, followed by a decrease in hardness upon coarsening, bcc metallic Cr phase formation and loss of oxygen, during annealing to 870 degrees C. The observed phase segregation opens up future design routes for pseudobinary oxides with tunable microstructural and mechanical properties. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2017. Vol. 131, 543-552 p.
Keyword [en]
Chromium zirconium oxide; Eskolaite; RF magnetron sputtering; Annealing; TEM
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-138476DOI: 10.1016/j.actamat.2017.03.063ISI: 000402343400051OAI: oai:DiVA.org:liu-138476DiVA: diva2:1111723
Note

Funding Agencies|Swedish Research Council (VR) [621-212-4368, 330-2014-6336]; AB Sandvik Coromant; Karlsruhe Nano Micro Facility (KNMF); Helmholtz research infrastructure at Karlsruhe Institute of Technology (KIT); Marie Sklodowska Curie Actions, Cofund [INCA 600398]; Knut and Alice Wallenberg Foundation

Available from: 2017-06-19 Created: 2017-06-19 Last updated: 2017-06-19

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Landälv, LudvigLu, JunJohansson-Joesaar, M. P.Alling, BjörnHultman, LarsEklund, Per
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