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Characterization of the 3-D amorphized zone beneath a Vickers indentation in boron carbide using Raman spectroscopy

Subhash, Ghatu and Ghosh, Dipankar and Blaber, Justin and Zheng, James Q. and Halls, Virginia and Masters, Karl (2013) Characterization of the 3-D amorphized zone beneath a Vickers indentation in boron carbide using Raman spectroscopy. Acta Materialia, 61 (10). pp. 3888-3896. ISSN 1359-6454. doi:10.1016/j.actamat.2013.03.028.

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In boron carbide (B_(4)C), the loss of crystallinity (i.e. amorphization) during high-pressure loading is known to result in reduced hardness and inferior ballistic performance. In this investigation, a systematic procedure is developed to evaluate the size and shape of the amorphized zone as well as the spatial distribution of the amorphization intensity beneath a Vickers indentation. This is accomplished by successive metallographic polishing and material removal from the indented surface at submicron depth increments and then scanning of each surface using micro-Raman spectrometry to construct a three-dimensional map of the amorphized zone. The amorphized zone in B_(4)C extends to a depth of almost seven times the indentation depth. The self-similarity in stress fields at various depths is also confirmed from quantitative description of the Raman peaks for various loads. Damage evolution in the form of a Mescall zone and initiation of radial cracking from the amorphized zone were also observed. It is inferred that the amorphization process initiates as soon as the indenter tip makes contact with the B_(4)C surface and thereafter the indenter penetrates into the weakened amorphized material. The implications of this observation and the utility of the quantitative information on the size and shape of the measured amorphized zone for calibration of multiscale models on structural changes in B_(4)C are discussed.

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Ghosh, Dipankar0000-0002-4574-9600
Additional Information:© 2013 Acta Materialia Inc. Published by Elsevier Ltd. Received 21 February 2013; received in revised form 19 March 2013; accepted 19 March 2013; Available online 11 April 2013.
Subject Keywords:Boron carbide; Amorphization; Micro-Raman spectroscopy; Vickers indentation
Issue or Number:10
Record Number:CaltechAUTHORS:20130723-114745086
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Official Citation:Ghatu Subhash, Dipankar Ghosh, Justin Blaber, James Q. Zheng, Virginia Halls, Karl Masters, Characterization of the 3-D amorphized zone beneath a Vickers indentation in boron carbide using Raman spectroscopy, Acta Materialia, Volume 61, Issue 10, June 201
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39528
Deposited On:23 Jul 2013 21:18
Last Modified:09 Nov 2021 23:45

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