Yttrium incorporation in Cr 2 AlC: On the metastable phase formation and decomposition of (Cr,Y) 2 AlC MAX phase thin films
Year: 2022
Type: article
Abstract: 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°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 Cr 2 AlC, Y 5 Al 3 , and Cr‐carbides. In contrast to pure Cr 2 AlC, 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 ∼200°C for 5 at.% Y compared to Cr 2 AlC. Calculations predicting the metastable phase formation of (Cr,Y) 2 AlC and its decomposition are in excellent agreement with the experimental findings.
DOI: 10.1111/jace.18931
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,950
Awards: G1333714419, G2061701933, G2863671479, Replenishing the limited Aluminium reservoir of MAX phase coatings in harsh environments, G3321450376, G434337789, Nya tvådimensionella material för energilagring, G712881263, G796431723, The Accelerator-based Ion Technology Center, Research And Development with Ion Beams – Advancing Technology in Europe
OpenAlex ID: W4313436775