New compositional design for creating tough metallic glass composites with excellent work hardening
- Gao, J.
- Sharp, J.
- Guan, D.
- Rainforth, W.M.
- Todd, L.
DOIAbstract
The extrinsic size of both crystalline alloys and amorphous metallic alloys strongly affects their mechanical properties at the submicron scale or nanometre scale. For example, Zr-based metallic glass nanopillars exhibit ceramic-like strengths (2.25 GPa) and metal-like ductility (25%) simultaneously when the pillar dimension is reduced to <100 nm. Here, we report a new compositional design approach to create tough metallic glass composites consisting of micrometre-scale dendrites and nanometre-scale amorphous matrices that exhibit high strength and ductility in the normally brittle MgZnCa metallic glass system. When the thickness of the amorphous matrix is reduced to the nanometre scale, a low density (ρ ≈ 1.99 g cm−3) Mg91.5Zn7.5Ca1 alloy ...
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