期刊
INTERMETALLICS
卷 136, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2021.107249
关键词
Metallic glasses; Thin films; Mechanical properties; Nanocrystalline structure; Deposition; Microstructure
资金
- Scientific and Technological Research Council of Turkey -TUB.ITAK 3501 CAREER Award [116M429]
- Middle East Technical University BAP Project [BAP-08-11-2016-072]
Cu-Nb alloys produced by combinatorial magnetron sputtering exhibit different microstructures, resulting in significant variations in hardness and resistance to plastic flow depending on the composition, highlighting a vast design space for structure-property relationships in this otherwise immiscible binary alloy.
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.
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