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Accessing thermoplastic processing windows in metallic glasses using rapid capacitive discharge.

Georg Kaltenboeck1, Thomas Harris1, Kerry Sun1

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

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Summary

Rapid heating of metallic glasses enables thermoplastic processing by accessing optimal viscosity ranges. This study demonstrates homogeneous heating and identifies critical rates to bypass crystallization, enabling precision part forging.

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Area of Science:

  • Materials Science
  • Physical Chemistry

Background:

  • Metallic glasses require precise thermal control for thermoplastic processing.
  • Conventional heating methods struggle to achieve uniform heating in bulk metallic glasses, risking crystallization.

Purpose of the Study:

  • To investigate the rapid-capacitive discharge method for accessing optimal viscosity ranges in metallic glasses.
  • To evaluate heating uniformity and crystallization stability during thermoplastic processing of Zr35Ti30Cu7.5Be27.5 metallic glass.

Main Methods:

  • Utilized rapid-capacitive discharge for volumetric heating of bulk metallic glass samples.
  • Employed high-speed thermal imaging to monitor heating uniformity and temperature stability.
  • Constructed a Time-Temperature-Transformation (TTT) diagram to determine critical heating rates.

Main Results:

  • Achieved homogeneous volumetric heating at rates of ~10^5 K/s, effectively bypassing crystallization.
  • Identified a critical heating rate of ~1000 K/s for the specific metallic glass composition.
  • Defined thermoplastic processing windows within the 10^0–10^4 Pa·s viscosity range.

Conclusions:

  • Rapid-capacitive discharge is a viable method for homogeneous heating of metallic glasses into their supercooled liquid region.
  • This technique enables precise control over thermal processing, facilitating the fabrication of complex metallic glass components.