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

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

In this work, the hardness and elastic modulus were investigated in Ag/Nb multilayers with the individual layer thickness (h) ranging from 1 to 50nm. The hardness increases with decreasing h, and the magnitudes of hardness of multilayers with h≤5nm are higher than that of either constituent. This ul...

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Veröffentlicht in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2016-01, Vol.651, p.155-159
Hauptverfasser: Wei, M.Z., Shi, J., Ma, Y.J., Cao, Z.H., Meng, X.K.
Format: Artikel
Sprache:eng
Schlagworte:
Coherence
Constituents
Elastic modulus
Hardness
Modulus of elasticity
Multilayers
Niobium
Silver
Superlattice
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Beschreibung
Zusammenfassung:In this work, the hardness and elastic modulus were investigated in Ag/Nb multilayers with the individual layer thickness (h) ranging from 1 to 50nm. The hardness increases with decreasing h, and the magnitudes of hardness of multilayers with h≤5nm 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≤20nm, where the modulus values are higher than that of either constituent, showing a supermodulus effect.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2015.10.107