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Fatigue stress concentration and notch sensitivity in nanocrystalline metals

Published online by Cambridge University Press:  11 March 2016

Timothy A. Furnish ,
Brad L. Boyce ,
John A. Sharon ,
Christopher J. O’Brien ,
Blythe G. Clark ,
Christian L. Arrington  and
Jamin R. Pillars
Timothy A. Furnish
Affiliation:
Materials Science & Engineering, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
Brad L. Boyce*
Affiliation:
Materials Science & Engineering, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
John A. Sharon
Affiliation:
Materials Science & Engineering, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA; and currently employed at United Technologies Research Center, Hartford, Connecticut 06118, USA
Christopher J. O’Brien
Affiliation:
Materials Science & Engineering, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
Blythe G. Clark
Affiliation:
Materials Science & Engineering, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
Christian L. Arrington
Affiliation:
Microsystems Science, Technology & Components, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
Jamin R. Pillars
Affiliation:
Microsystems Science, Technology & Components, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Recent studies have shown the potential for nanocrystalline metals to possess excellent fatigue resistance compared to their coarse-grained counterparts. Although the mechanical properties of nanocrystalline metals are believed to be particularly susceptible to material defects, a systematic study of the effects of geometric discontinuities on their fatigue performance has not yet been performed. In the present work, nanocrystalline Ni–40 wt%Fe containing both intrinsic and extrinsic defects were tested in tension–tension fatigue. The defects were found to dramatically reduce the fatigue resistance, which was attributed to the relatively high notch sensitivity in the nanocrystalline material. Microstructural analysis within the crack-initiation zones underneath the defects revealed cyclically-induced abnormal grain growth (AGG) as a predominant deformation and crack initiation mechanism during high-cycle fatigue. The onset of AGG and the ensuing fracture is likely accelerated by the stress concentrations, resulting in the reduced fatigue resistance compared to the relatively defect-free counterparts.

Keywords

fatiguenanocrystallinedefectsnotchesfracture
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 6 , 28 March 2016 , pp. 740 - 752
Copyright
Copyright © Materials Research Society 2016 

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References

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