Microstructures and strengthening mechanisms of Cu/Ni/W nanolayered composites |
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Authors: | JW Yan XF Zhu HS Liu C Yan |
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Institution: | 1. Shenyang National Laboratory for Materials Science , Institute of Metal Research, Chinese Academy of Sciences , 72 Wenhua Road, Shenyang 110016 , P.R. China;2. School of Engineering Systems, Faculty of Built Environment and Engineering, Queensland University of Technology , Brisbane , QLD 4001 , Australia |
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Abstract: | Cu/Ni/W nanolayered composites with individual layer thickness ranging from 5?nm to 300?nm were prepared by a magnetron sputtering system. Microstructures and strength of the nanolayered composites were investigated by using the nanoindentation method combined with theoretical analysis. Microstructure characterization revealed that the Cu/Ni/W composite consists of a typical Cu/Ni coherent interface and Cu/W and Ni/W incoherent interfaces. Cu/Ni/W composites have an ultrahigh strength and a large strengthening ability compared with bi-constituent Cu–X (X?=?Ni, W, Au, Ag, Cr, Nb, etc.) nanolayered composites. Summarizing the present results and those reported in the literature, we systematically analyze the origin of the ultrahigh strength and its length scale dependence by taking into account the constituent layer properties, layer scales and heterogeneous layer/layer interface characteristics, including lattice and modulus mismatch as well as interface structure. |
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Keywords: | metallic nanolayered composite strength length scale interface dislocation |
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