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The strength of Cu/Au multilayers with different individual layer thicknesses (λ) from 25 to 250nm has been investigated by nanoindentation testing. It is found that the increase in strength of the Cu/Au multilayers with decreasing λ follows the Hall–Petch relation until λ is less than 50nm. Based on the concept of lattice mismatch, a simple model is proposed to describe interface strengthening ability...
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