Superior fatigue crack growth resistance, irreversibility, and fatigue crack growth–microstructure relationship of nanocrystalline alloys

While previous studies have reported that nanocrystalline materials exhibit poor resistance to fatigue crack growth (FCG), the electro-deposited nanocrystalline Ni–Co alloys tested in this paper show superior resistance to FCG. The high damage tolerance of our alloy is attributed to the following: a...

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Veröffentlicht in:Acta materialia 2011-11, Vol.59 (19), p.7340-7355
Hauptverfasser: Sangid, Michael D., Pataky, Garrett J., Sehitoglu, Huseyin, Rateick, Richard G., Niendorf, Thomas, Maier, Hans J.
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container_end_page 7355
container_issue 19
container_start_page 7340
container_title Acta materialia
container_volume 59
creator Sangid, Michael D.
Pataky, Garrett J.
Sehitoglu, Huseyin
Rateick, Richard G.
Niendorf, Thomas
Maier, Hans J.
description While previous studies have reported that nanocrystalline materials exhibit poor resistance to fatigue crack growth (FCG), the electro-deposited nanocrystalline Ni–Co alloys tested in this paper show superior resistance to FCG. The high damage tolerance of our alloy is attributed to the following: alloying with Co, low internal stresses resulting in stability of the microstructure, and a combination of high strength and ductility. The high density of grain boundaries interact with the dislocations emitted from the crack tip, which impedes FCG, as predicted by the present model and measured experimentally by digital image correlation. Further, the addition of Co increases the strength of the material by refining the grain size, reducing the fraction of low angle grain boundaries, and reducing the stacking fault energy of the material, thereby increasing the prevalence of twinning. The microstructure is stabilized by minimizing the internal stress during a stress relief heat treatment following the electro-deposition process. As a result grain growth does not occur during deformation, leaving dislocation-mediated plasticity as the primary deformation mechanism. The low internal stresses and nanoscale twins preserve the ductility of the material, thereby reaching a balance between strength and ductility, which results in a superior resistance to FCG.
doi_str_mv 10.1016/j.actamat.2011.07.058
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subjects Alloying
Alloys
Applied sciences
Crack propagation
Ductility
Exact sciences and technology
Fatigue
Fatigue failure
Fracture mechanics
Grain boundaries
Irreversibility
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Nanocrystalline alloys
Nanocrystals
Nanostructure
title Superior fatigue crack growth resistance, irreversibility, and fatigue crack growth–microstructure relationship of nanocrystalline alloys
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