Shaping metallic glasses by electromagnetic pulsing

Georg Kaltenboeck, Marios D. Demetriou (), Scott Roberts and William L. Johnson
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Georg Kaltenboeck: Keck Engineering Laboratories, California Institute of Technology
Marios D. Demetriou: Keck Engineering Laboratories, California Institute of Technology
Scott Roberts: Keck Engineering Laboratories, California Institute of Technology
William L. Johnson: Keck Engineering Laboratories, California Institute of Technology

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract With damage tolerance rivalling advanced engineering alloys and thermoplastic forming capabilities analogous to conventional plastics, metallic glasses are emerging as a modern engineering material. Here, we take advantage of their unique electrical and rheological properties along with the classic Lorentz force concept to demonstrate that electromagnetic coupling of electric current and a magnetic field can thermoplastically shape a metallic glass without conventional heating sources or applied mechanical forces. Specifically, we identify a process window where application of an electric current pulse in the presence of a normally directed magnetic field can ohmically heat a metallic glass to a softened state, while simultaneously inducing a large enough magnetic body force to plastically shape it. The heating and shaping is performed on millisecond timescales, effectively bypassing crystallization producing fully amorphous-shaped parts. This electromagnetic forming approach lays the groundwork for a versatile, time- and energy-efficient manufacturing platform for ultrastrong metals.

Date: 2016
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DOI: 10.1038/ncomms10576

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