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The shock response of amorphous steels was studied for the first time. Partial devitrification in bulk metallic glasses significantly enhances their Hugoniot Elastic Limit and post-yield strength.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Physics

Background:

  • Amorphous steels and bulk metallic glasses (BMGs) exhibit unique mechanical properties.
  • Understanding their response to extreme conditions like shock wave compression is crucial for advanced applications.

Purpose of the Study:

  • To investigate the shock wave compression response of amorphous steels.
  • To evaluate the influence of partial devitrification on the mechanical behavior of BMGs under shock loading.

Main Methods:

  • Experiments were conducted on two iron-based metallic glass matrix composites (SAM2X5-600 and SAM2X5-630) with varying crystalline precipitate content.
  • Shock response was determined by measuring rear free surface velocity using interferometry after high-velocity impact.

Main Results:

  • The Hugoniot Elastic Limit (HEL) was determined to be 8.58 ± 0.53 GPa for the amorphous sample (SAM2X5-600) and 11.76 ± 1.26 GPa for the partially crystalline sample (SAM2X5-630).
  • The HEL for SAM2X5-630 is the highest reported for any BMG.
  • SAM2X5-600 lost post-yield strength, while SAM2X5-630 retained strength beyond the HEL, exhibiting strain-softening.

Conclusions:

  • Partial devitrification significantly strengthens bulk metallic glasses under shock compression.
  • The presence of crystalline precipitates enhances both the elastic limit and the post-yield strength retention of amorphous steels.