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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Shaping metallic glasses by electromagnetic pulsing.

Georg Kaltenboeck1, Marios D Demetriou1, Scott Roberts1

  • 1Keck Engineering Laboratories, California Institute of Technology, Pasadena, California 91125, USA.

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|February 9, 2016
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Summary

Metallic glasses can now be shaped using electromagnetic forces, bypassing traditional heating and mechanical methods. This novel technique enables rapid, energy-efficient manufacturing of strong, amorphous metal parts.

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Area of Science:

  • Materials Science
  • Manufacturing Engineering
  • Physics

Background:

  • Metallic glasses offer high damage tolerance and thermoplastic forming capabilities, positioning them as advanced engineering materials.
  • Conventional manufacturing of metallic glasses often requires high temperatures and mechanical forces, limiting efficiency and design flexibility.

Purpose of the Study:

  • To demonstrate a novel method for thermoplastically shaping metallic glasses using electromagnetic coupling.
  • To leverage the unique electrical and rheological properties of metallic glasses for manufacturing applications.

Main Methods:

  • Utilizing the Lorentz force concept by applying an electric current pulse and a magnetic field to metallic glasses.
  • Identifying a specific process window for simultaneous ohmic heating and magnetic body force induction.
  • Performing heating and shaping on millisecond timescales to prevent crystallization.

Main Results:

  • Successful thermoplastic shaping of metallic glasses via electromagnetic induction without external heating or mechanical force.
  • Achieved rapid (millisecond timescale) forming, resulting in fully amorphous, defect-free parts.
  • Demonstrated a viable method for creating complex shapes from metallic glasses.

Conclusions:

  • Electromagnetic forming offers a versatile, time- and energy-efficient manufacturing platform for ultrastrong metallic glasses.
  • This approach bypasses conventional heating and mechanical processes, enabling rapid production of amorphous parts.
  • The developed technique paves the way for new applications of metallic glasses in advanced manufacturing.