Jan Rys, Lorenzo Valdevit, Tobias A. Schaedler, Alan J. Jacobsen, William B. Carter and Julia R. Greer Fabrication and Deformation of Metallic Glass Micro-Lattices Advanced Engineering Materials 16
This work presents the fabrication, characterization and properties of hollow metallic glass nickel-phosphorous microlattices. We discovered that at wall thicknesses below ≈150nm the mechanical properties can no longer be calculated by classical models, with strengths nearly an order of magnitude higher than predicted. This is caused by a shift in deformation mechanism from post-elastic catastrophic failure in thick-walled structures to localized plastic deformability, which emerges as a result of brittle-to-ductile transition in nano-sized metallic glasses. These findings suggest a viable and economic route to design and fabricate high-strength, lightweight structural materials by combining structural effects with material size effects.
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