Journal
PHILOSOPHICAL MAGAZINE LETTERS
Volume 83, Issue 8, Pages 477-483Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/0950083031000151383
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This letter presents systematic experimental observations of fatigue damage and corresponding dislocation structures in thin Cu films as a function of film thickness made using transmission electron microscopy and focused-ion-beam microscopy. It is found that, in thick films and grains of at least 3.0 mum diameter, coarse surface extrusions and dislocation wall and cell structures occur whereas, in thin films or in small-diameter grains, finer extrusions occur but no clearly defined dislocation structures are present. This minimum required dimension of 3.0 mum for fatigue damage formation may be caused by constrained dislocation motion in small dimensions.
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