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The effects of copper addition on phase composition in (CrFeCo)1-yNy multicomponent thin films
Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten.ORCID-id: 0000-0002-2696-4372
Linköpings universitet, Institutionen för fysik, kemi och biologi, Plasma och ytbeläggningsfysik. Linköpings universitet, Tekniska fakulteten.ORCID-id: 0000-0002-6602-7981
Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten.
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2022 (Engelska)Ingår i: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 572, artikel-id 151315Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The Cantor alloy CrFeCoMnNi is generally fcc structured, but moderate changes in the composition can have a large influence on the phase formation. The aim of this study was to understand the changes brought on in lownitrogen-containing (CrFeCo)1-yNy thin films with y = 0.19 on the addition of copper, an interesting metal in terms of atomic size and nitride formation enthalpy. (CrFeCoCux)1-yNy films were grown by reactive magnetron sputtering. The amount of copper in the films was increased from x = 0 to x = 0.15 to study competitive phase formation. Without Cu, two-phase fcc + bcc films were obtained. The addition of Cu was found to stabilize the bcc structure despite the fact that Cu as a pure metal is fcc. Nanoindentation tests showed slight increase in hardness with initial Cu addition from 11 GPa to 13.7 +/- 0.2 GPa. The occurrence of pile up as opposed to cracking is an indication of the films ductility.

Ort, förlag, år, upplaga, sidor
Elsevier , 2022. Vol. 572, artikel-id 151315
Nyckelord [en]
Multicomponent; Coating; Magnetron sputtering; High entropy alloy
Nationell ämneskategori
Annan materialteknik
Identifikatorer
URN: urn:nbn:se:liu:diva-181456DOI: 10.1016/j.apsusc.2021.151315ISI: 000718301200003OAI: oai:DiVA.org:liu-181456DiVA, id: diva2:1615026
Anmärkning

Funding Agencies|VINNOVA Competence Centre FunMat-II [2016-05156]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009 00971]; Knut and Alice Wallenberg Foundation through the Wallenberg Academy Fellows program [2020.0196]; Knut and Alice Wallenberg Foundation through Electron Microscopy Laboratory at Linkoping University; Swedish Research Council via VR-RFI contract [C0514401]; Swedish Foundation for Strategic Research via SSF contract [RIF140053]

Tillgänglig från: 2021-11-29 Skapad: 2021-11-29 Senast uppdaterad: 2023-12-28
Ingår i avhandling
1. Cantor-Alloy-Based Multicomponent Nitride Thin Films
Öppna denna publikation i ny flik eller fönster >>Cantor-Alloy-Based Multicomponent Nitride Thin Films
2023 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

In this Thesis, I have investigated multicomponent alloy based thin films synthesized by magnetron sputtering. The studies in the thesis are centered around the phase diagram of the CrFeCoNi nitrogen containing system. Theoretical and experimental methods were employed to understand the phase formation in this system which is related to the archetypical Cantor alloy (CrMnFeCoNi). CrFeCoNi thin films of approximately equimolar composition crystallize with fcc structure when grown at room temperature. This structure, however, is not retained when nitrogen (x) is added into the lattice. Density functional theory calculations together with the experimental investigation on the (CrFeCoNi)Nx system revealed the stabilization of the metallic fcc when x ≤ 0.22 and the stabilization of the NaCl B1 structure when x > 0.33, consistent with the theoretical prediction. In contrast, films with intermediate amounts of nitrogen (x = 0.22) grown at higher temperatures show segregation into multiple phases of CrN, Fe-Ni-rich and Co. These results offer an explanation for the requirement of kinetically limited growth conditions at low temperature for obtaining single-phase CrFeCoNi Cantor-like nitrogen-containing thin films. The importance of the phase diagram is realized when attempting to grow much more complex structures for application-oriented research such as irradiation resistance, corrosion resistance as well as epitaxial films for a fundamental understanding of the material system. The phase diagram of the CrFeCoNi system indicated that higher stability of the single-phase solid solution Cantor nitride lay in a limited temperature range of 200 to 300 °C. In order to compensate for the higher deposition temperature required to grow epitaxial films magnetic field assisted dc magnetron sputtering was used. This technique allows for the control of the flux of Ar ions bombarding the substrate during growth thereby providing the growing film with kinetic energy as opposed to thermal. The results from the study indicated that the quality of epitaxy can be improved by increasing low ion energy, high ion-flux bombardment. The thesis in whole, gives a fundamental understanding of the nitride cantor alloy material system in terms of crystal structure, mechanical and electrical properties.

Ort, förlag, år, upplaga, sidor
Linköping: Linköping University Electronic Press, 2023. s. 46
Serie
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 2287
Nyckelord
Thin films, Multicomponent alloys, Magnetron sputtering
Nationell ämneskategori
Den kondenserade materiens fysik
Identifikatorer
urn:nbn:se:liu:diva-191824 (URN)10.3384/9789180750424 (DOI)9789180750417 (ISBN)9789180750424 (ISBN)
Disputation
2023-03-15, NOBEL-BL32, B Building, Campus Valla, Linköping, 09:15 (Engelska)
Opponent
Handledare
Anmärkning

Funding agencies: VINNOVA Competence Centre FunMat-II (grant no. 2016-05156), the Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linköping University (Faculty Grant SFO-Mat-LiU No. 2009 00971), and the Centre in Nanoscience and technology at LiTH, (CeNano)

Tillgänglig från: 2023-02-17 Skapad: 2023-02-17 Senast uppdaterad: 2023-02-17Bibliografiskt granskad

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