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Dynamic Evolution of Defect Structures during Spall Failure of Nanocrystalline Al

Published online by Cambridge University Press:  10 March 2016

Kathleen Coleman,
Garvit Agarwal and
Avinash M. Dongare
Kathleen Coleman
Affiliation:
Department of Materials Science and Engineering, and Institute of Materials Science, University of Connecticut, Storrs, CT, United States
Garvit Agarwal
Affiliation:
Department of Materials Science and Engineering, and Institute of Materials Science, University of Connecticut, Storrs, CT, United States
Avinash M. Dongare*
Affiliation:
Department of Materials Science and Engineering, and Institute of Materials Science, University of Connecticut, Storrs, CT, United States
*
*Corresponding author, electronic mail: dongare@uconn.edu
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Abstract

The dynamic evolution and interaction of defects under the conditions of shock loading in nanocrystalline Al with an average grain size of 20 nm is investigated using molecular dynamics simulations for an impact velocity of 1 km/s. Four stages of defect evolution are identified during shock deformation and failure that correspond to the initial shock compression (I), the propagation of the compression wave (II), the propagation and interaction of the reflected tensile waves (III), and the nucleation, growth, and coalescence of voids (IV). The results suggest that the spall strength of the nanocrystalline Al system is attributed to a high density of Shockley partials and a slightly lower density of twinning partials (twins) in the material experiencing the peak tensile pressures.

Keywords

dislocationsshock loadingAl

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Type
Articles
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MRS Advances , Volume 1 , Issue 58: Mechanical Behavior and Failure of Materials , 2016, pp. 3853 - 3858
Copyright
Copyright © Materials Research Society 2016 

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