Shock-Induced Localized Amorphization in Boron Carbide

Author:

Chen Mingwei1,McCauley James W.2,Hemker Kevin J.1

Affiliation:

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

2. U.S. Army Research Laboratory, Aberdeen Proving Ground, Aberdeen, MD 21005, USA.

Abstract

High-resolution electron microscope observations of shock-loaded boron carbide have revealed the formation of nanoscale intragranular amorphous bands that occur parallel to specific crystallographic planes and contiguously with apparent cleaved fracture surfaces. This damage mechanism explains the measured, but not previously understood, decrease in the ballistic performance of boron carbide at high impact rates and pressures. The formation of these amorphous bands is also an example of how shock loading can result in the synthesis of novel structures and materials with substantially altered properties.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference30 articles.

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5. D. Dandekar Shock Response of Boron Carbide: ARL-TR-2456 (Army Research Laboratory Aberdeen Proving Ground Aberdeen MD 2001).

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