Rethinking scaling laws in the high-cycle fatigue response of nanostructured and coarse-grained metals

Journal Article · 06 January 2020 · International Journal of Fatigue

DOI: https://doi.org/10.1016/j.ijfatigue.2020.105472 · OSTI ID:1601259

Heckman, Nathan M. ^[1]; Padilla, Henry A. ^[1]; Michael, Joseph R. ^[1]; Barr, Christopher M. ^[1]; Clark, Blythe G. ^[1]; Hattar, Khalid ^[1]; Boyce, Brad L. ^[1]

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1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

We discuss that the high-cycle fatigue life of nanocrystalline and ultrafine-grained Ni-Fe was examined for five distinct grain sizes ranging from approximately 50–600 nm. The fatigue properties were strongly dependent on grain size, with the endurance limit changing by a factor of 4 over this narrow range of grain size. The dataset suggests a breakdown in fatigue improvement for the smallest grain sizes <100 nm, likely associated with a transition to grain coarsening as a dominant rate-limiting mechanism. The dataset also is used to explore fatigue prediction from monotonic tensile properties, suggesting that a characteristic flow strength is more meaningful than the widely-utilized ultimate tensile strength.

• Research Organization: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
• Grant/Contract Number: AC04-94AL85000
• OSTI ID: 1601259
• Report Number(s): SAND2020--1182J; 683357
• Journal Information: International Journal of Fatigue, Journal Name: International Journal of Fatigue Journal Issue: C Vol. 134; ISSN 0142-1123
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English