Interfacial Structures Governed Plastic Deformation Behaviors in Metallic Multilayers |
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Authors: | Ming-Zhen Wei Zhen-Hua Cao Xiang-Kang Meng |
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Affiliation: | 1.Institute of Materials Engineering, National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093,China2 Department of Physics, School of Science, Linyi University,Linyi 276000, China |
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Abstract: | In this work, we have investigated the mechanical properties of Cu/Ta, Ag/Cu and Ag/Nb multilayers with different heterogeneous interfaces. The results suggest that when individual layer thickness (h) is larger than 5-10 nm, the hardness/strength of three different multilayer systems has the similar length scale effect with decreasing layer thickness, while when h ≤ 5 nm, the three multilayer systems show remarkably different plastic deformation behaviors. The strength curves exhibit the variation trends of unchanging, softening and increasing corresponding to Cu/Ta, Ag/Cu and Ag/Nb multilayers, respectively. The microstructure analysis shows that three kinds of multilayers have totally different interfacial structures, which lead to the different strengthening or softening mechanisms. |
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Keywords: | Metallic multilayers Plastic deformation Interfacial structures Strengthening mechanism |
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