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Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis
13:09

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Published on: January 6, 2016

Shock-induced localized amorphization in boron carbide.

Mingwei Chen1, James W McCauley, Kevin J Hemker

  • 1Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA.

Science (New York, N.Y.)
|March 8, 2003
PubMed
Summary
This summary is machine-generated.

Shock loading boron carbide creates nanoscale amorphous bands, explaining its reduced ballistic performance at high impact rates. This process also synthesizes novel materials with altered properties.

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Area of Science:

  • Materials Science
  • Solid Mechanics
  • Nanotechnology

Background:

  • Boron carbide exhibits complex behavior under high-pressure shock loading.
  • Previous understanding of ballistic performance degradation in boron carbide was incomplete.

Purpose of the Study:

  • To investigate the microstructural mechanisms behind the decreased ballistic performance of shock-loaded boron carbide.
  • To elucidate the role of nanoscale structural changes in material properties.

Main Methods:

  • High-resolution electron microscopy was employed to observe shock-loaded boron carbide.
  • Analysis focused on intragranular features and their relationship to fracture surfaces.

Main Results:

  • Nanoscale amorphous bands were observed forming parallel to specific crystallographic planes.
  • These amorphous bands were found contiguously with cleaved fracture surfaces.
  • A direct correlation between band formation and reduced ballistic performance was established.

Conclusions:

  • The formation of nanoscale amorphous bands is the primary damage mechanism responsible for decreased ballistic performance in boron carbide under high impact.
  • Shock loading can induce the synthesis of novel nanostructures with significantly modified material properties.
  • This research provides a mechanistic understanding of material failure under extreme conditions.