Microstructure and nanomechanical behavior of sputtered CuNb thin films

Date

2021-09-01

Author

Abboud, Mohammad
Motallebzadeh, Amir
Duygulu, Özgür
Maaß, Robert
Özerinç, Sezer

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We report on the mechanical properties of Cu–Nb alloys produced by combinatorial magnetron sputtering. Depending on the composition, the microstructure is either fully amorphous (~30–65 at.% Cu), a dispersion of Cu crystallites in an amorphous matrix (~70 at.%), or a dominant crystalline phase with separated nanoscale amorphous zones (~80 at.% Cu). Nanomechanical probing of the different microstructures reveals that the hardness of the fully amorphous alloy is much higher than a rule of mixture would predict. We further demonstrate a remarkable tunability of the resistance to plastic flow, ranging from ca. 9 GPa in the amorphous regime to ca. 2 GPa in the fully crystalline regime. We rationalize these findings based on fundamental structural considerations, thereby highlighting the vast structure-property design space that this otherwise immiscible binary alloy provides.

Subject Keywords

Metallic glasses, Thin films, Mechanical properties, Nanocrystalline structure, Deposition, Microstructure

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85107276769&origin=inward
https://hdl.handle.net/11511/91024

Journal

Intermetallics

DOI

https://doi.org/10.1016/j.intermet.2021.107249

Collections

Department of Mechanical Engineering, Article

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Citation Formats

M. Abboud, A. Motallebzadeh, Ö. Duygulu, R. Maaß, and S. Özerinç, “Microstructure and nanomechanical behavior of sputtered CuNb thin films,” Intermetallics, pp. 0–0, 2021, Accessed: 00, 2021. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85107276769&origin=inward.