@inproceedings{e8ac50dfcc1649e88c24046c9b2718a3,
title = "Nucleation and growth of voids in shock loaded copper bicrystals",
abstract = "Understanding the evolution of damage and deformation due to spall at grain boundaries can provide a basis for connecting micro- to macroscale failure behavior in metals under extreme conditions. Copper bicrystal samples were shock loaded using flyer-plate impacts in a light gas gun with shock stresses ranging from 3 to 6 GPa. Pulse duration as well as crystal orientation along the shock direction were varied for a fixed boundary misorientation to determine their effects on void nucleation and coalescence. Samples were soft recovered and cross-sectioned to characterize damage using electron backscattering diffraction and scanning electron microscopy to gather information on damage characteristics at and around the GB, with emphasis on growth of boundary and bulk voids. Chemistry and composition analysis were also performed on samples to determine if trace elements present in a sample affected the threshold for void nucleation. Results show that the kinetics of damage growth at the boundary are strongly affected by stress level and impurities. It was found that the boundary selected had a similar or even lower tendency to show damage than the bulk at low pulse durations and amplitudes. As pulse duration and amplitude increased damage localized at the boundary, which was found to consist of many small voids, indicating that the boundary experienced rapid void nucleation and coalescence. The presence of impurities correlated strongly with scatter on damage evolution.",
author = "Elizabeth Fortin and Benjamin Shaffer and Saul Opie and Pedro Peralta",
note = "Funding Information: This work was funded by the Department of Energy, NNSA, under Grants NA0002005 and NA0002917. The Mechanical Testing and the Secondary Ion Mass Spectrometry Laboratories at ASU are gratefully acknowledged. Publisher Copyright: {\textcopyright} 2020 American Institute of Physics Inc.. All rights reserved.; 21st Biennial American Physical Society Conference on Shock Compression of Condensed Matter, SCCM 2019 ; Conference date: 16-06-2019 Through 21-06-2019",
year = "2020",
month = nov,
day = "2",
doi = "10.1063/12.0000905",
language = "English (US)",
series = "AIP Conference Proceedings",
publisher = "American Institute of Physics Inc.",
editor = "Lane, {J. Matthew D.} and Germann, {Timothy C.} and Armstrong, {Michael R.} and Ryan Wixom and David Damm and Joseph Zaug",
booktitle = "Shock Compression of Condensed Matter - 2019",
}