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Thermal stability of nanocrystalline nickel with yttrium additions

Published online by Cambridge University Press:  19 March 2013

K.A. Darling ,
L.J. Kecskes ,
M. Atwater ,
J. Semones ,
R.O. Scattergood  and
C.C. Koch
K.A. Darling*
Affiliation:
Weapons and Materials Research Directorate, Lightweight and Specialty Metals Branch, RDRL-WMM-F, Aberdeen Proving Ground, Maryland 21005-5069
L.J. Kecskes
Affiliation:
Weapons and Materials Research Directorate, Lightweight and Specialty Metals Branch, RDRL-WMM-F, Aberdeen Proving Ground, Maryland 21005-5069
M. Atwater
Affiliation:
Department of Applied Engineering, Safety & Technology, Millersville University, Millersville, Pennsylvania 17551
J. Semones
Affiliation:
Department of Materials Science and Engineering, NC State University, Raleigh, North Carolina, 27695-7907
R.O. Scattergood
Affiliation:
Department of Materials Science and Engineering, NC State University, Raleigh, North Carolina, 27695-7907
C.C. Koch
Affiliation:
Department of Materials Science and Engineering, NC State University, Raleigh, North Carolina, 27695-7907
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Nickel-yttrium nanocrystalline alloys with an as-milled grain size of approximately 6.5 nm were synthesized using high-energy cryogenic mechanical alloying. The microstructural changes due to annealing were characterized using x-ray line broadening, microhardness, focused ion beam channeling contrast imaging, and transmission electron microscopy. Experiments demonstrated that increasing yttrium content led to stabilization of the nanocrystalline grain size at elevated homologous annealing temperatures. Additionally, it was found that inadvertent contamination with nitrogen during the milling process caused the formation of yttrium nitride (YN) precipitates, which, in turn, resulted in an additional nonlinear hardening effect beyond the expected hardening due to grain-size reduction. Results reveal that kinetic pinning by YN particles is effective in retaining a nanostructure to relatively high temperatures.

Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 13: FOCUS ISSUE: Frontiers in Thin-Film Epitaxy and Nanostructured Materials , 14 July 2013 , pp. 1813 - 1819
Copyright
Copyright © Materials Research Society 2013 

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References

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