Significance of non-equilibrium grain boundaries in surface damage formation of ultrafine-grained copper in high-cycle fatigue

High-cycle fatigue tests were carried out on specimens of ultrafine-grained copper both after equal channel angular pressing and after subsequent annealing at 160 °C for 3 min. The formation behavior of surface damage and the change in surface hardness during stressing was monitored. A close relatio...

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Bibliographic Details
Published in:	Scripta materialia Vol. 57; no. 4; pp. 293 - 296
Main Authors:	Goto, M., Han, S.Z., Kim, S.S., Kawagoishi, N., Lim, C.Y.
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 01-08-2007
Subjects:	Annealing ANNEALING PROCESSES BOUNDARIES Copper Damage Equal channel angular pressing EQUILIBRIUM FAILURE Fatigue Fatigue failure FATIGUE PROPERTIES GRAIN BOUNDARIES GRAIN SIZE AND SHAPE HARDNESS High cycle fatigue Microstructure MICROSTRUCTURES Mild heat treatment Grain boundaries Fatigue Equal channel angular pressing Copper Mild heat treatment
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Summary:	High-cycle fatigue tests were carried out on specimens of ultrafine-grained copper both after equal channel angular pressing and after subsequent annealing at 160 °C for 3 min. The formation behavior of surface damage and the change in surface hardness during stressing was monitored. A close relationship was observed between the change in hardness and the formation behavior of surface damage. The physical background for the formation of surface fatigue damage is discussed from the viewpoint of the non-equilibrium states of the microstructure.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	1359-6462 1872-8456
DOI:	10.1016/j.scriptamat.2007.04.040