Journal
JOURNAL OF MATERIALS RESEARCH
Volume 24, Issue 3, Pages 728-735Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1557/JMR.2009.0092
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The mechanical response to indentation (including nano- and microindentation) has been investigated in Cu/Au and Cu/Cr multilayers with respective layer thickness ratios of 1: 1 and 2: 1, and individual layer thickness ranging from nanometer to submicrometer scale. It was found that the Cu/Cr multilayer has higher strength than the Cu/Au multilayer, although both multilayers have close Hall-Petch slope. Examination of indentation-induced deformation behavior shows that the Cu/Cr multilayer exhibits higher resistance to plastic deformation instability than the Cu/Au multilayer. Theoretical analysis indicates that the significant difference in mechanical response originates from the constituent layer Configuration and interface structures, which impose distinguishing confining effect on dislocation activity.
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