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  • Bakhit, Babak,1983-Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten (author)

Age hardening in superhard ZrB2-rich Zr1-xTaxBy thin films

  • Article/chapterEnglish2021

Publisher, publication year, extent ...

  • Elsevier,2021
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:uu-425451
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-425451URI
  • https://doi.org/10.1016/j.scriptamat.2020.09.026DOI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-170224URI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • We recently showed that sputter-deposited Zr1-xTaxBy thin films have hexagonal AlB2-type columnar nanostructure in which column boundaries are B-rich for x < 0.2, while Ta-rich for x ≥ 0.2. As-deposited layers with x ≥ 0.2 exhibit higher hardness and, simultaneously, enhanced toughness. Here, we study the mechanical properties of ZrB2.4, Zr0.8Ta0.2B1.8, and Zr0.7Ta0.3B1.5 films annealed in Ar atmosphere as a function of annealing temperature Ta up to 1200 °C. In-situ and ex-situ nanoindentation analyses reveal that all films undergo age hardening up to Ta = 800 °C, with the highest hardness achieved for Zr0.8Ta0.2B1.8 (45.5±1.0 GPa). The age hardening, which occurs without any phase separation or decomposition, can be explained by point-defect recovery that enhances chemical bond density. Although hardness decreases at Ta > 800 °C due mainly to recrystallization, column coarsening, and planar defect annihilation, all layers show hardness values above 34 GPa over the entire Ta range.

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  • Palisaitis, Justinas,1983-Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten(Swepub:liu)juspa01 (author)
  • Wu, ZhengtaoGuangdong Univ Technol, Sch Electromech Engn, Guangzhou 510006, Peoples R China.,School of Electromechanical Engineering, Guangdong University of Technology, China (author)
  • Sortica, Mauricio A.Uppsala universitet,Tillämpad kärnfysik,Applied Nuclear Physics, Department of Physics and Astronomy, Uppsala University, Sweden(Swepub:uu)mauso471 (author)
  • Primetzhofer, DanielUppsala universitet,Tillämpad kärnfysik,Applied Nuclear Physics, Department of Physics and Astronomy, Uppsala University, Sweden(Swepub:uu)danpr521 (author)
  • Persson, Per O. Å.,1971-Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten(Swepub:liu)perpe25 (author)
  • Rosén, Johanna,1975-Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten(Swepub:liu)johro07 (author)
  • Hultman, Lars,Professor,1960-Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten(Swepub:liu)larhu75 (author)
  • Petrov, Ivan,1949-Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten,Materials Research Laboratory and Department of Materials Science, University of Illinois, USA; Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taiwan(Swepub:liu)ivape26 (author)
  • Greene, Joseph E.,1944-Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten,Materials Research Laboratory and Department of Materials Science, University of Illinois, USA; Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taiwan(Swepub:liu)josgr17 (author)
  • Greczynski, Grzegorz,1973-Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten(Swepub:liu)grzgr49 (author)
  • Linköpings universitetTunnfilmsfysik (creator_code:org_t)

Related titles

  • In:Scripta Materialia: Elsevier191, s. 120-1251359-64621872-8456

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