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, Julia R. Greer

Research output: Contribution to journalArticle

39 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)5176-5183
Number of pages8
JournalNano letters
Volume14
Issue number9
DOIs
StatePublished - Sep 10 2014

Keywords

  • Amorphous
  • Ni-P
  • ductility
  • irradiation
  • mechanical properties

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