Thermomechanical Behavior of Molded Metallic Glass Nanowires

Scientific Reports
Daniel J MagagnoscDaniel S Gianola

Abstract

Metallic glasses are disordered materials that offer the unique ability to perform thermoplastic forming operations at low thermal budget while preserving excellent mechanical properties such as high strength, large elastic strain limits, and wear resistance owing to the metallic nature of bonding and lack of internal defects. Interest in molding micro- and nanoscale metallic glass objects is driven by the promise of robust and high performance micro- and nanoelectromechanical systems and miniature energy conversion devices. Yet accurate and efficient processing of these materials hinges on a robust understanding of their thermomechanical behavior. Here, we combine large-scale thermoplastic tensile deformation of collections of Pt-based amorphous nanowires with quantitative thermomechanical studies of individual nanowires in creep-like conditions to demonstrate that superplastic-like flow persists to small length scales. Systematic studies as a function of temperature, strain-rate, and applied stress reveal the transition from Newtonian to non-Newtonian flow to be ubiquitous across the investigated length scales. However, we provide evidence that nanoscale specimens sustain greater free volume generation at elevated temperature...Continue Reading

References

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Citations

Dec 14, 2018·Nanotechnology·Aditi RoyHan Huang
Apr 25, 2017·Advanced Science·Shiliang WangHan Huang
Apr 9, 2019·Science and Technology of Advanced Materials·Nurul Akmal Che Lah, Sonia Trigueros

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Methods Mentioned

BETA
transmission electron microscopy

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