Nanoscratch Behavior of Metallic Glass/Crystalline Nanolayered Composites
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Nanolayered metallic glass/crystalline composites provide an effective structure for improving the ductility of metallic glasses while maintaining their outstanding strength. The combination of high strength and ductility make these nanocomposites promising materials as wear-resistant coatings. In this work, we experimentally investigated the mechanical properties and nanoscratch behavior of CuZr/Zr metallic glass/crystalline nanolayers. The scratch resistance was highest for the monolithic CuZr, and diminished with decreasing layer thickness for nanolayered coatings, although hardness and elastic modulus were independent of layer thickness. The nanocomposite with a layer thickness of 10 nm did not show any signs of failure in spite of compressive strain exceeding 80%. The low shear strength of the CuZr/Zr interface and strain hardening of Zr layers can explain the layer thickness-dependent scratch resistance and outstanding damage tolerance observed. Layered metallic glass/crystalline nanocomposites combine high hardness and resistance to fracture, providing a new design space for the development of effective wear-resistant coatings.
This research is supported by the Scientific and Technological Research Council of Turkey—CAREER Award #116M429 and METU-BAP Project #08-11-2016-072. We thank METU Central Laboratory, Koç University KUYTAM, and Bilkent University UNAM for their support in characterization measurements and Dr. Eren Kalay for useful discussions. TEM work was carried out in part in the Frederick Seitz Materials Research Laboratory Central Facilities, University of Illinois.
Conflict of interest
The authors declare that they have no conflict of interest.
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