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Abstract
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 low-nitrogen-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 film’s ductility.
Highlights
Multicomponent alloys, a concept which includes but is not limited to high entropy alloys (HEA), have been gaining interest due to their solid solution structure as well as the interesting properties they exhibit [1,2]
We studied the effects of nitrogen (~15 at. % to ~ 30 at. %) on the crystal structure of a simplified Cantor variant (CrFeCo) thin film where, as the amount of nitrogen increased the structure changed from fcc to bcc [13]
A lab-scale ultrahigh vacuum magnetron sputtering system evacu ated to a base pressure < 9 × 10-7 Pa was used to deposit CrFeCo-based nitride films
Summary
Multicomponent alloys, a concept which includes but is not limited to high entropy alloys (HEA), have been gaining interest due to their solid solution structure as well as the interesting properties they exhibit [1,2]. The Cantor alloy, an equimolar mixture of Fe-Cr-Mn-Ni-Co exhibiting an fcc crystal structure was one of the first multicomponent systems to be studied and serves as a model system. In the AlxCoCrFeNi alloy system, addition of Al is known to transform the crystal structure from fcc to as a consequence of the lattice distortion effect [8,9]. Adding elements such as Al and Ti to the Cantor alloy increases δ, while elements with smaller atomic radii such as Cu do not affect δ as much.
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