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  • Holzapfel, Damian M.Rhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany. (author)

Enhanced thermal stability of (Ti,Al)N coatings by oxygen incorporation

  • Article/chapterEnglish2021

Publisher, publication year, extent ...

  • Elsevier,2021
  • printrdacarrier

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  • LIBRIS-ID:oai:DiVA.org:mau-62921
  • https://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-62921URI
  • https://doi.org/10.1016/j.actamat.2021.117204DOI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-458318URI

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  • Language:English
  • Summary in:English

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

Notes

  • Thermal stability of protective coatings is one of the performance-defining properties for advanced cutting and forming applications as well as for energy conversion. To investigate the effect of oxygen incorporation on the high-temperature behavior of (Ti,Al)N, metastable cubic (Ti,Al)N and (Ti,Al)(OxN1-x) coatings are synthesized using reactive arc evaporation. X-ray diffraction of (Ti,Al)N and (Ti,Al)(OxN1-x) coatings reveals that spinodal decomposition is initiated at approximately 800 degrees C, while the subsequent formation of wurtzite solid solution is clearly delayed from 1000 degrees C to 1300 degrees C for (Ti,Al)(OxN1-x) compared to (Ti,Al)N. This thermal stability enhancement can be rationalized based on calculated vacancy formation energies in combination with spatially-resolved composition analysis and calorimetric data: Energy dispersive X-ray spectroscopy and atom probe tomography data indicate a lower O solubility in wurtzite solid solution compared to cubic (Ti,Al)(O,N). Hence, it is evident that for the growth of the wurtzite, AlN-rich phase in (Ti,Al)N, only mobility of Ti and Al is required, while for (Ti,Al)(O,N), in addition to mobile metal atoms, also non-metal mobility is required. Prerequisite for mobility on the non-metal sublattice is the formation of non-metal vacancies which require larger temperatures than for the metal sublattice due to significantly larger magnitudes of formation energies for the non-metal vacancies compared to the metal vacancies. This notion is consistent with calorimetry data which indicate that the combined energy necessary to form and grow the wurtzite phase is larger by a factor of approximately two in (Ti,Al)(O,N) than in (Ti,Al)N, causing the here reported thermal stability increase. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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  • Music, DenisMalmö universitet,Institutionen för materialvetenskap och tillämpad matematik (MTM),Malmö Univ, Dept Mat Sci & Appl Math, S-20506 Malmö, Sweden.(Swepub:mau)al3932 (author)
  • Hans, MarcusRhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany. (author)
  • Wolff-Goodrich, SilasMax Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany. (author)
  • Holec, DavidUniv Leoben, Dept Mat Sci, A-8700 Leoben, Austria. (author)
  • Bogdanovski, DimitriRhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany. (author)
  • Arndt, MirjamOerlikon Balzers Coating Germany GmbH, Hohe Hum Str 22, D-79650 Schopfheim, Germany. (author)
  • Eriksson, Anders O.Oerlikon Surface Solut AG, Oerlikon Balzers, Iramali 18, LI-9496 Balzers, Liechtenstein. (author)
  • Yalamanchili, KumarOerlikon Surface Solut AG, Oerlikon Balzers, Iramali 18, LI-9496 Balzers, Liechtenstein. (author)
  • Primetzhofer, DanielUppsala universitet,Tillämpad kärnfysik(Swepub:uu)danpr521 (author)
  • Liebscher, Christian H.Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany. (author)
  • Schneider, Jochen M.Rhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany. (author)
  • Rhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany.Institutionen för materialvetenskap och tillämpad matematik (MTM) (creator_code:org_t)

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  • In:Acta Materialia: Elsevier2181359-64541873-2453

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