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Title: Nucleation and Growth of Bubbles in He Ion Implanted V/Ag Multilayers

Abstract

Microstructures of He ion-implanted pure Ag, pure V and polycrystalline V/Ag multilayers with individual layer thickness ranging from 1 nm to 50 nm were investigated by transmission electron microscopy (TEM). The bubbles in the Ag layer were faceted and larger than the non-faceted bubbles in the V layer under the same implantation conditions for both pure metals and multilayers. The substantially higher single defects surviving the spike phase and lower mobility of trapped He in bcc than those in fcc could account for this difference. For multilayers, the bubbles nucleate at interfaces but grow preferentially in Ag layers due to high mobility of trapped He in fcc Ag. In addition, the He concentration above which bubbles can be detected in defocused TEM images increases with decreasing layer thickness, from 0 for pure Ag to 4–5 at. % for 1 nm V/1 nm Ag multilayers. In contrast, the bubble size decreases with decreasing layer thickness, from approximately 4 nm in diameter in pure Ag to 1 nm in the 1 nm V/1 nm Ag multilayers. Elongated bubbles confined in the Ag layer by the V–Ag interfaces were observed in 1 nm multilayers. These observations show that bubble nucleation and growth canmore » be suppressed to high He concentrations in nanoscale composites with interfaces that have high He solubility.« less

Authors:
 [1];  [1];  [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC), Center for Materials at Irradiation and Mechanical Extremes (CMIME)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1064947
DOE Contract Number:  
2008LANL1026
Resource Type:
Journal Article
Journal Name:
Philosophical Magazine (2003, Print)
Additional Journal Information:
Journal Volume: 91; Journal Issue: 4; Related Information: CMIME partners with Los Alamos National Laboratory (lead); Carnegie Mellon University; University of Illinois, Urbana Champaign; Massachusetts Institute of Technology; University of Nebraska; Journal ID: ISSN 1478-6435
Publisher:
Taylor & Francis
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; nuclear (including radiation effects); defects; mechanical behavior; materials and chemistry by design; synthesis (novel materials); synthesis (scalable processing)

Citation Formats

Wei, Q. M., Wang, Y. Q., Nastasi, Michael, and Misra, A. Nucleation and Growth of Bubbles in He Ion Implanted V/Ag Multilayers. United States: N. p., 2011. Web. doi:10.1080/14786435.2010.526647.
Wei, Q. M., Wang, Y. Q., Nastasi, Michael, & Misra, A. Nucleation and Growth of Bubbles in He Ion Implanted V/Ag Multilayers. United States. doi:10.1080/14786435.2010.526647.
Wei, Q. M., Wang, Y. Q., Nastasi, Michael, and Misra, A. Fri . "Nucleation and Growth of Bubbles in He Ion Implanted V/Ag Multilayers". United States. doi:10.1080/14786435.2010.526647.
@article{osti_1064947,
title = {Nucleation and Growth of Bubbles in He Ion Implanted V/Ag Multilayers},
author = {Wei, Q. M. and Wang, Y. Q. and Nastasi, Michael and Misra, A.},
abstractNote = {Microstructures of He ion-implanted pure Ag, pure V and polycrystalline V/Ag multilayers with individual layer thickness ranging from 1 nm to 50 nm were investigated by transmission electron microscopy (TEM). The bubbles in the Ag layer were faceted and larger than the non-faceted bubbles in the V layer under the same implantation conditions for both pure metals and multilayers. The substantially higher single defects surviving the spike phase and lower mobility of trapped He in bcc than those in fcc could account for this difference. For multilayers, the bubbles nucleate at interfaces but grow preferentially in Ag layers due to high mobility of trapped He in fcc Ag. In addition, the He concentration above which bubbles can be detected in defocused TEM images increases with decreasing layer thickness, from 0 for pure Ag to 4–5 at. % for 1 nm V/1 nm Ag multilayers. In contrast, the bubble size decreases with decreasing layer thickness, from approximately 4 nm in diameter in pure Ag to 1 nm in the 1 nm V/1 nm Ag multilayers. Elongated bubbles confined in the Ag layer by the V–Ag interfaces were observed in 1 nm multilayers. These observations show that bubble nucleation and growth can be suppressed to high He concentrations in nanoscale composites with interfaces that have high He solubility.},
doi = {10.1080/14786435.2010.526647},
journal = {Philosophical Magazine (2003, Print)},
issn = {1478-6435},
number = 4,
volume = 91,
place = {United States},
year = {2011},
month = {11}
}