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Novel nanoscale precipitate structures in ion-irradiated Cu1−x Vx alloys: “Cherry-pit” formation

Published online by Cambridge University Press:  18 December 2014

Brad Stumphy ,
Robert S. Averback  and
Pascal Bellon
Brad Stumphy
Affiliation:
Department of Materials Science and Engineering, Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
Robert S. Averback
Affiliation:
Department of Materials Science and Engineering, Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
Pascal Bellon*
Affiliation:
Department of Materials Science and Engineering, Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
*
a) Address all correspondence to this author. e-mail: bellon@illinois.edu
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Abstract

The nanoscale precipitation induced by 1.8 MeV ion irradiation in Cu1−x Vx thin films, with x ≈ 0.09 and 0.91, was studied by atom probe tomography. For the Cu91V9 alloys, irradiation in the range of 300–500 °C led to steady-state compositional patterning of V-rich nanoprecipitates. V nanoprecipitates larger than ∼10 nm in diameter, moreover, contained Cu-rich cores, resulting in an unusual “cherry-pit” nanostructure. The number of these pits within one precipitate increased with the precipitate size, but with the volume fraction of pits within a given precipitate remaining roughly constant, from ∼1.5 to 5%. Similar irradiations performed on V91Cu9 also resulted in an enhanced precipitation reaction, but with smaller Cu-rich nanoprecipitates, <3 nm in diameter, and no “cherry pits.” These results are rationalized using recent atomistic simulations that have explored the conditions for stabilizing by ion irradiation “cherry-pit” nanostructures in immiscible A–B alloy systems, such as Cu–V.

Keywords

Curadiation effectsnanostructure

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Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 2 , 28 January 2015 , pp. 170 - 178
Copyright
Copyright © Materials Research Society 2015 

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