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[论文]The ultra-high enhancement Ag/Nb multilayers

The ultra-high enhancement of hardness and elastic modulus in Ag/Nb multilayers

Wei MZ,Shi J, Ma YJ , Cao ZH, Meng XK

Institute of Materials Engineering, National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Nanjing University,Jiangsu, People's Republic of China.

In this work, the hardness and elastic modulus were investigated in Ag/Nb multilayers with the in-dividual layer thickness (h) ranging from 1 to 50 nm. The hardness increases with decreasing h, and the magnitudes of hardness of multilayers with h≤5 nm are higher than that of either constituent. This ultra-high strengthening results from the coherency stresses and high density stacking faults in Ag layers. Meanwhile, the enhancement of elastic modulus is achieved due to the lattice contraction when h≤20 nm, where the modulus values are higher than that of either constituent, showing a super-modulus effect.

Materials Science & Engineering A, 2016,651,155-159.