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Investigations into the slip behavior of zirconium diboride

Published online by Cambridge University Press:  10 June 2016

Brett Hunter
Affiliation:
Department of Metallurgical & Materials Engineering, University of Alabama, Tuscaloosa, AL 35405
Xiao-Xiang Yu
Affiliation:
Department of Metallurgical & Materials Engineering, University of Alabama, Tuscaloosa, AL 35405
Nicholas De Leon
Affiliation:
Department of Metallurgical & Materials Engineering, University of Alabama, Tuscaloosa, AL 35405
Christopher Weinberger
Affiliation:
Department of Mechanical Engineering and Mechanics, Drexel University, Philadelphia, PA 19104
William Fahrenholtz
Affiliation:
Department of Materials Science & Engineering, Missouri S&T, Rolla, MO 65401
Greg Hilmas
Affiliation:
Department of Materials Science & Engineering, Missouri S&T, Rolla, MO 65401
Mark L. Weaver
Affiliation:
Department of Metallurgical & Materials Engineering, University of Alabama, Tuscaloosa, AL 35405
Gregory B. Thompson*
Affiliation:
Department of Metallurgical & Materials Engineering, University of Alabama, Tuscaloosa, AL 35405
*Corresponding
a) Address all correspondence to this author. e-mail: gthompson@eng.ua.edu
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Abstract

The slip systems in ZrB2 flexural tested at 1000 °C and 1500 °C have been quantified. The dislocations in both samples were long and straight with a dislocation density of approximately 1013 m−2. The structure of the dislocations as well as the low density is in agreement with a ceramic that is hard and brittle and dislocation nucleation and motion is restricted. The low temperature slip systems were found to include c-prismatic slip— ${1 \mathord{\left/ {\vphantom {1 3}} \right. \kern-\nulldelimiterspace} 3}\left[ {0001} \right]\left( {\bar 1010} \right)$ —and a-pyramidal slip— ${1 \mathord{\left/ {\vphantom {1 3}} \right. \kern-\nulldelimiterspace} 3}\left[ {11\bar 20} \right]\left( {\bar 1101} \right)$ whereas the elevated temperature sample revealed a-basal slip— ${1 \mathord{\left/ {\vphantom {1 3}} \right. \kern-\nulldelimiterspace} 3}\left[ {11\bar 20} \right]\left( {0001} \right)$ . Density functional theory Generalized Stacking Fault Energy curves for perfect slip were calculated and agreed well with geometric considerations for slip, including interplanar spacing and planar packing. Though basal slip has the lowest fault energy, the presence of the other dislocation types is suggestive that the activation barrier is not a hindrance for the temperatures studied and is likely activated to increase the number of plastic degrees of freedom.

Type
Focus Section: Reinventing Boron Chemistry and Materials for the 21st Century
Copyright
Copyright © Materials Research Society 2016 

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