title: Shaping metallic glasses by electromagnetic pulsing.
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.
authors: Keck Engineering Laboratories, California Institute of Technology, Pasadena, California 91125, USA.
authors: Georg
authors: G
authors: Kaltenboeck
authors: Keck Engineering Laboratories, California Institute of Technology, Pasadena, California 91125, USA.
authors: Marios D
authors: MD
authors: Demetriou
authors: Keck Engineering Laboratories, California Institute of Technology, Pasadena, California 91125, USA.
authors: Scott
authors: S
authors: Roberts
authors: Keck Engineering Laboratories, California Institute of Technology, Pasadena, California 91125, USA.
authors: William L
authors: WL
authors: Johnson