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Deformation of as-fabricated and helium implanted 100 nm-diameter iron nano-pillars

Landau, Peri and Guo, Qiang and Hosemann, Peter and Wang, Yongqiang and Greer, Julia R. (2014) Deformation of as-fabricated and helium implanted 100 nm-diameter iron nano-pillars. Materials Science and Engineering A, 612 . pp. 316-325. ISSN 0921-5093. http://resolver.caltech.edu/CaltechAUTHORS:20140911-092057079

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Abstract

〈101〉-oriented cylindrical single crystalline Fe samples with diameters of 100 nm and heights of 1 μm were implanted with 0.36±0.06 at% helium throughout their gauge sections. Uniaxial deformation experiments revealed a 40% higher yield and ultimate strengths in tension and a 25% higher yield strength and flow stress at 10% plastic strain in compression for implanted samples compared with as-fabricated ones. Observed tension–compression asymmetry in implanted pillars was attributed to the non-planarity of screw dislocation cores and to twinning-antitwinning deformation typical of bcc metals and the interaction between dislocations and He bubbles. Compressive stress–strain data in both sets of samples had three distinct regimes: (1) elastic loading followed by (2) discrete strain bursts during plastic flow with significant hardening up to strains of 5%, and (3) “steady state” discrete plasticity characterized by nearly-constant average flow stress. Each regime is discussed and explained in terms of competition in the rates of dislocation multiplication and dislocation annihilation.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.msea.2014.06.052 DOIArticle
http://www.sciencedirect.com/science/article/pii/S0921509314007692PublisherArticle
ORCID:
AuthorORCID
Greer, Julia R.0000-0002-9675-1508
Additional Information:© 2014 Elsevier B.V. Received 24 March 2014; Received in revised form 12 June 2014; Accepted 14 June 2014; Available online 20 June 2014. The authors gratefully acknowledge the financial support of the U.S. Department of Energy, Office of Basic Energy Sciences through JRG׳s Early Career grant DE-FOA-00003951. The authors also acknowledge support and infrastructure provided by the Kavli Nanoscience Institute (KNI). Helium implantation was supported by Center for Integrated Nanotechnologies (CINT), a DOE nanoscience center jointly operated by Los Alamos and Sandia National Laboratories.
Group:Kavli Nanoscience Institute
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-FOA-00003951
Kavli Nanoscience Institute (KNI)UNSPECIFIED
Center for Integrated Nanotechnologies (CINT)UNSPECIFIED
Subject Keywords:Nanoscale plasticity; Tension test; Compression test; Iron; Helium implantation
Record Number:CaltechAUTHORS:20140911-092057079
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140911-092057079
Official Citation:Peri Landau, Qiang Guo, Peter Hosemann, Yongqiang Wang, Julia R. Greer, Deformation of as-fabricated and helium implanted 100 nm-diameter iron nano-pillars, Materials Science and Engineering: A, Volume 612, 26 August 2014, Pages 316-325, ISSN 0921-5093, http://dx.doi.org/10.1016/j.msea.2014.06.052. (http://www.sciencedirect.com/science/article/pii/S0921509314007692)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49580
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:11 Sep 2014 22:08
Last Modified:09 Sep 2015 22:21

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