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Effects of helium implantation on tensile properties and microstructure of amorphous nickel phosphorous metallic glasses

Greer, Julia R. and Liontas, Rachel and Gu, Wendy and Wang, Yongqiang and Li, Nan and Fu, Engang and Mara, Nathan (2014) Effects of helium implantation on tensile properties and microstructure of amorphous nickel phosphorous metallic glasses. In: 247th ACS National Meeting & Exposition, March 16-20, 2014, Dallas, TX.

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Nuclear reactions generate insol. helium, which forms nano-sized bubbles that can lead to swelling and embrittlement of irradiated materials. Innovative structural materials must be created and utilized to enable new-generation nuclear reactors to withstand harsh thermomech. environments and to suppress helium-induced embrittlement. One family of candidate structural materials is metallic glasses, which offer high elastic limit and strength, corrosion resistance, and potential for improved ductility upon irradn. A significant detriment in their use for structural applications is catastrophic failure under tensile loadsWe use templated electron-beam lithog. and electro-deposition to fabricate 100 nm-diam. amorphous Ni-P metallic glass cylindrical nano-tensile specimens. Earlier studies in our group demonstrated the emergence of brittle-to-ductile transition in nano-sized metallic glasses upon tension, with useful ductility in excess of 20% in some cases. In this work we explore the effects of Helium implantation into already-ductile nano-sized metallic glasses. Helium was implanted uniformly into each sample at a concn. of 3 at% at 25°C and at 280°C to result in the bubble sizes between 2-3nm and ∼10nm. In-situ uniaxial tension expts. revealed that He-ion implantation increased available plastic strain in the nano-metallic glass tensile specimens by a factor of 2 and maintained the high strength of ∼2.1 GPa. We discuss these promising results in the framework of microstructural and defect response to ion irradn. in metallic glasses.

Item Type:Conference or Workshop Item (Paper)
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Greer, Julia R.0000-0002-9675-1508
Additional Information:© 2014 American Chemical Society.
Record Number:CaltechAUTHORS:20140424-104958021
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45189
Deposited By: Tony Diaz
Deposited On:24 Apr 2014 22:17
Last Modified:03 Oct 2019 06:27

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