Effects of grain refinement due to severe plastic deformation on the growth behavior of small cracks in copper

► The difference in the growth behavior tendency between CG and UFG copper occurred at an extremely low CGR (dl/dN10−6mm/c could be estimated by σanl, (n=7.5 for CG, n=4.4 for UFG). To clarify the effects of grain refinement on the growth behavior of small surface cracks, fatigue tests on round bar...

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Veröffentlicht in:	International journal of fatigue 2013-05, Vol.50, p.63-71
Hauptverfasser:	Goto, M., Kamil, K., Han, S.Z., Euh, K., Kim, S.S., Yokoho, Y.
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Copper CRACK GROWTH Crack propagation CRACKING CRACKS Cycles DEFORMATION Exact sciences and technology FAILURE Fatigue Fatigue (materials) Fatigue failure Grain refinement GRAIN SIZE AND SHAPE Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology Metals. Metallurgy Plastic deformation PLASTIC STRAIN Small surface crack Striation
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Beschreibung
Zusammenfassung:	► The difference in the growth behavior tendency between CG and UFG copper occurred at an extremely low CGR (dl/dN10−6mm/c could be estimated by σanl, (n=7.5 for CG, n=4.4 for UFG). To clarify the effects of grain refinement on the growth behavior of small surface cracks, fatigue tests on round bar specimens were conducted on coarse-grained (CG) copper and ultrafine-grained (UFG) copper processed with equal channel angular pressing. The growth behavior of a small crack was monitored using a plastic replication technique. The difference in the growth behavior tendency between the CG and UFG copper occurred at an extremely low fatigue crack growth rate (FCGR) of dl/dN
ISSN:	0142-1123 1879-3452
DOI:	10.1016/j.ijfatigue.2012.02.020