Yttrium incorporation in Cr2AlC: On the metastable phase formation and decomposition of (Cr,Y)(2)AlC MAX phase thin films

Azina, ClioRhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany. (författare)

Yttrium incorporation in Cr2AlC : On the metastable phase formation and decomposition of (Cr,Y)(2)AlC MAX phase thin films

Funding Agencies|European Unions Horizon 2020 [824096, 892501]; Swedish Foundation for Strategic Research [EM16-0004]; Swedish Research Council [2018-05973, 2019-00191]
Herein we report on the synthesis of a metastable (Cr,Y)(2)AlC MAX phase solid solution by co-sputtering from a composite Cr-Al-C and elemental Y target, at room temperature, followed by annealing. However, direct high-temperature synthesis resulted in multiphase films, as evidenced by X-ray diffraction analyses, room-temperature depositions, followed by annealing to 760 degrees C led to the formation of phase pure (Cr,Y)(2)AlC by diffusion. Higher annealing temperatures caused a decomposition of the metastable phase into Cr2AlC, Y5Al3, and Cr-carbides. In contrast to pure Cr2AlC, the Y-containing phase crystallizes directly in the MAX phase structure instead of first forming a disordered solid solution. Furthermore, the crystallization temperature was shown to be Y-content dependent and was increased by similar to 200 degrees C for 5 at.% Y compared to Cr2AlC. Calculations predicting the metastable phase formation of (Cr,Y)(2)AlC and its decomposition are in excellent agreement with the experimental findings.

Bartsch, TimRhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany. (författare)
Holzapfel, Damian M.Rhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany. (författare)
Dahlqvist, Martin,1982-Linköpings universitet,Materialdesign,Tekniska fakulteten(Swepub:liu)marda09 (författare)
Rosén, Johanna,Professor,1975-Linköpings universitet,Materialdesign,Tekniska fakulteten(Swepub:liu)johro07 (författare)
Lofler, LukasRhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany. (författare)
Mendez, Alba San JoseDeutsch Elektronen Synchrotron DESY, Hamburg, Germany. (författare)
Hans, MarcusRhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany. (författare)
Primetzhofer, DanielUppsala universitet,Tillämpad kärnfysik,Uppsala Univ, Sweden(Swepub:uu)danpr521 (författare)
Schneider, Jochen M.Rhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany. (författare)
Rhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany.Materialdesign (creator_code:org_t)

Ingår i:Journal of The American Ceramic Society: John Wiley & Sons106:4, s. 2652-26650002-78201551-2916

Av författaren/redakt...: Azina, Clio; Bartsch, Tim; Holzapfel, Damia ...; Dahlqvist, Marti ...; Rosén, Johanna, ...; Lofler, Lukas; visa fler...; Mendez, Alba San ...; Hans, Marcus; Primetzhofer, Da ...; Schneider, Joche ...; visa färre...

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