Dynamic Devitrification of Bulk Metallic Glasses (BMGs) and Composites of BMG With Tungsten

Abstract

The penetration behavior of tungsten-bulk metallic glass (BMG) matrix composites is expected to be strongly influenced by the deformation behavior of the BMG matrix. It has been hypothesized that when the BMC matrix, initially in its viscous, deeply undercooled state, is subjected to compressive loads under the rapid time scales during ballistic impact, it may become a liquid without devitrification. We have carried out a series of in-situ x-ray diffraction experiments at the Advanced Photon Source (APS) and the National Synchrotron Light Source (NSLS) on BMG samples while heating them. At the same time, we carried out differential thermal analysis experiments and analyzed the results using the Kissinger method to estimate the critical heating rates necessary to bypass devitrification. The data collected and results show that the heating rates available at either APS or NSLS were insufficient to verify the hypothesis.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 2005
Accession Number
ADA439854

Entities

People

  • Laszlo J Kecskes
  • Robert H. Woodman
  • Samuel F. Trevino

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Human Systems
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Charge Coupled Devices
  • Composite Materials
  • Detectors
  • Differential Thermal Analysis
  • Diffraction
  • Equations
  • Glass Transition Temperature
  • Light Sources
  • Materials
  • Military Research
  • Phase Transformations
  • Research Facilities
  • Scattering
  • Thermal Analysis
  • Transition Temperature
  • X Rays
  • X-Ray Diffraction

Readers

  • Materials Science and Engineering.
  • Reinforced Composite Materials
  • Surface Coatings Technology.