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Supermodulus effect by grain-boundary wetting in nanostructured multilayers

查看全文 作　　者：Jing [1]Wang;Lu [1]Han;Xiaohu [2]Li;Dongguang [3]Liu;Laima [4]Luo;Yuan [1]Huang;Yongchang [1]Liu;Zumin [1]Wang 高影响力作者 机构地区：[1]State Key Lab of Hydraulic Engineering Simulation and Safety,School of Materials Science and Engineering,Tianjin University,Tianjin 300350,China;[2]German Engineering Materials Centre at MLZ,Helmholtz-Zentrum Geestacht,D-85747 Garching,Germany;[3]Institute of Industry and Equipment Technology,Hefei University of Technology,Hefei 230009,China;[4]School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2021年第6期,共8页高影响力期刊 基　　金：supported by the National Key Research and Development Program of China(No.2017YFE0302600 and No.2017YFB0701801)。 摘　　要：The effect of thermal treatments on mechanical properties was systematically investigated in Ni/Mo multilayers with a constant modulation period(160 nm)prepared by magnetron sputtering deposition.A supermodulus effect was found in the annealed multilayers as compared to the as-deposited state.A large tensile stress development was observed in the multilayers.The evolution of grain-boundary(GB)wetting was observed at the interfaces of the multilayers,which results in an enhanced modulus based on the mechanism of GB-wetting-induced interfacial stress/strain.The GB wetting phenomenon was further supported by a thermodynamic calculation.The results not only bring clear evidence of the important role of interfacial structures in governing the elastic behavior of metallic multilayers,but also allow designing the multilayers with special properties through atomic diffusion and wetting at the interfaces based on the thermodynamic calculation. 关 键 词：MULTILAYER Elastic modulus Grain-boundary wetting STRESS Thermodynamic calculation
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