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Effects of Helium Implantation on the Tensile Properties and Microstructure of Ni₇₃P₂₇ Metallic Glass Nanostructures

Liontas, Rachel and Gu, X. Wendy and Fu, Engang and Wang, Yonqiang and Li, Nan and Mara, Nathan and Greer, Julia R. (2014) Effects of Helium Implantation on the Tensile Properties and Microstructure of Ni₇₃P₂₇ Metallic Glass Nanostructures. Nano Letters, 14 (9). pp. 5176-5183. ISSN 1530-6984. doi:10.1021/nl502074d.

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We report fabrication and nanomechanical tension experiments on as-fabricated and helium-implanted 130 nm diameter Ni₇₃P₂₇ metallic glass nanocylinders. The nanocylinders were fabricated by a templated electroplating process and implanted with He+ at energies of 50, 100, 150, and 200 keV to create a uniform helium concentration of 3 atom % throughout the nanocylinders. Transmission electron microscopy imaging and through-focus analysis reveal that the specimens contained 2 nm helium bubbles distributed uniformly throughout the nanocylinder volume. In situ tensile experiments indicate that helium-implanted specimens exhibit enhanced ductility as evidenced by a 2-fold increase in plastic strain over as-fabricated specimens with no sacrifice in yield and ultimate tensile strengths. This improvement in mechanical properties suggests that metallic glasses may actually exhibit a favorable response to high levels of helium implantation.

Item Type:Article
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Greer, Julia R.0000-0002-9675-1508
Additional Information:© 2014 American Chemical Society. Received: June 4, 2014; Revised: July 21, 2014; Published: August 1, 2014. The authors gratefully acknowledge the financial support of the U.S. Department of Energy through J.R.G.’s Early Career Research Program under Grant DE-SC0006599. Additional financial support was provided by X.W.G.’s National Defense Science and Engineering Graduate Fellowship and R.L.’s National Science Foundation Graduate Research Fellowship. This material is based upon work supported by the National Science Foundation Graduate Research Fellowship Program under Grant DGE-1144469. Any opinions, findings, and conclusions or recommendations expressed in the material are those of the authors and do not necessarily reflect the views of the National Science Foundation. The authors thank David Chen and Kelly Guan for developing the Ni−P electroplating conditions and Dongchan Jang and Carol Garland for TEM assistance. The authors also thank the Kavli Nanoscience Institute (KNI) at Caltech for support and availability of cleanroom facilities, and the Center for Integrated Nanotechnologies (CINT) user program for use of ion beam facilities at Los Alamos National Laboratory. This work was performed in part at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science. Los Alamos National Laboratory, an affirmative action equal opportunity employer, is operated by Los Alamos National Security, LLC, for the National Nuclear Security Administration of the U.S. Department of Energy under contract DEAC52-06NA25396.
Group:Kavli Nanoscience Institute
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0006599
National Defense Science and Engineering Graduate (NDSEG) FellowshipUNSPECIFIED
NSF Graduate Research FellowshipDGE-1144469
Department of Energy (DOE)DEAC52-06NA25396
Subject Keywords:Amorphous; Ni−P; irradiation; ductility; mechanical properties
Issue or Number:9
Record Number:CaltechAUTHORS:20140811-094735112
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Official Citation:Effects of Helium Implantation on the Tensile Properties and Microstructure of Ni73P27 Metallic Glass Nanostructures Rachel Liontas, X. Wendy Gu, Engang Fu, Yongqiang Wang, Nan Li, Nathan Mara, and Julia R. Greer Nano Letters 2014 14 (9), 5176-5183
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48291
Deposited On:11 Aug 2014 18:07
Last Modified:10 Nov 2021 18:31

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