Effects of helium implantation on the tensile properties and microstructure of Ni73P27 metallic glass nanostructures.

نویسندگان

  • Rachel Liontas
  • X Wendy Gu
  • Engang Fu
  • Yongqiang Wang
  • Nan Li
  • Nathan Mara
  • Julia R Greer
چکیده

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.

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عنوان ژورنال:
  • Nano letters

دوره 14 9  شماره 

صفحات  -

تاریخ انتشار 2014