Effect of shot peening on the fatigue life of a Zr-based bulk metallic glass

The fatigue lives of a Zr-based bulk metallic glass (BMG) in the as-cast and shot-peened conditions were evaluated. Results suggest that shot peening does not cause significant enhancement of the fatigue performance of the BMG. Cracks were observed to nucleate in subsurface regions. This was attribu...

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Bibliographic Details
Published in:Scripta materialia 2008-07, Vol.59 (2), p.167-170
Main Authors: Raghavan, R., Ayer, R., Jin, H.W., Marzinsky, C.N., Ramamurty, U.
Format: Article
Language:English
Subjects:
Amorphous materials
Fatigue
Fatigue life
Metallic glasses
Microcracks
Nanoindentation
Nucleation
Residual stresses
Shear bands
Shot peening
Zirconium
Zirconium base alloys
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Summary:The fatigue lives of a Zr-based bulk metallic glass (BMG) in the as-cast and shot-peened conditions were evaluated. Results suggest that shot peening does not cause significant enhancement of the fatigue performance of the BMG. Cracks were observed to nucleate in subsurface regions. This was attributed to the domination of the compressive residual stress field on the surface over deformation-induced plastic flow softening that otherwise leads to easy nucleation of shear bands which act like microcracks.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2008.03.009