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Shallow and deep nanoindentation on W/NbN nanolayers
Mao SX; Ennis BM; Wei YG(魏悦广)
Source PublicationSolid Mechanics and its Applications
Conference NameIUTAM Symposium on Mechanical Behavior and Micro-Mechanics of Nanostructured Materials
Conference DateJune 27, 2005 - June 30, 2005
Conference PlaceBeijing, China
AbstractSuperlatice W(100)/NbN(100) with bilayer periods (Γ = 5.6 and 10.4 nm) was non-isostructural superlattice material and fabricated by depositing alternating layers of single crystal tungsten (W), a body-centered cubic metal, and niobium nitride (NbN), a face-centered cubic ceramic, on a MgO single crystal substrate. The lattice constants of the ceramic and metal layers are 0.439 nm and 0.315 nm respectively. The superlattice are nanocomposites that exhibit a hardness at small bilayer repeat periods which exceeds the hardness predicted by the rule of mixtures for normal composites by deep nanoindentation, while shallow nanoindentations does not demonstrate the superhardening. The results indicate that the elastic modulus does not influence the hardness of the superlattice materials. The superhardening results at deeper indentation depths is related to the nature of the interface between the layers in the superlattice materials. Normally, superlattice gains hardness by losing deformability, however, the superlattice demonstrated excellent deformability when reaching the superhardening. © 2007 Springer.
KeywordAlternating Layers Bi-layer Bilayer Period Body-centered Cubic Face-centered Cubic Indentation Depth Metal Layer Mgo Single Crystals Nano Layers Niobium Nitride Rule Of Mixture Superhardening
WOS IDWOS:000245400900015
Indexed ByCPCI-S ; EI
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Document Type会议论文
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GB/T 7714
Mao SX,Ennis BM,Wei YG. Shallow and deep nanoindentation on W/NbN nanolayers[C]Solid Mechanics and its Applications,2007.
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