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Layer Thickness-Dependent Hardness and Strain Rate Sensitivity of Cu-Al/Al Nanostructured Multilayers

Ya-Qiang Wang , Zhao-Qi Hou , Jin-Yu Zhang , Xiao-Qing Liang , Gang Liu , Guo-Jun Zhang , Jun Sun

Cu-Al/Al nanostructured metallic multilayers with Al layer thickness h _Al varying from 5 to 100 nm were prepared, and their mechanical properties and deformation behaviors were studied by nanoindentation testing. The results showed that the hardness increased drastically with decreasing h _Al down to about 20 nm, whereafter the hardness reached a plateau that approaches the hardness of the alloyed Cu-Al monolithic thin films. The strain rate sensitivity (SRS, m), however, decreased monotonically with reducing h _Al. The layer thickness-dependent strengthening mechanisms were discussed, and it was revealed that the alloyed Cu-Al nanolayers dominated at h _Al ≤ 20 nm, while the crystalline Al nanolayers dominated at h _Al > 20 nm. The plastic deformation was mainly related to the ductile Al nanolayers, which was responsible for the monotonic evolution of SRS with h _Al. In addition, the h _Al-dependent hardness and SRS were quantitatively modeled in light of the strengthening mechanisms at different length scales.

关键词: Nanostructured , films , Cu-Al/Al , multilayers , Hardness , Strain , rate , sensitivity , Layer , thickness , dependence

An Easy Way to Quantify the Adhesion Energy of Nanostructured Cu/X (X = Cr, Ta, Mo, Nb, Zr) Multilayer Films Adherent to Polyimide Substrates

Kai Wu , Jin-Yu Zhang , Gang Liu , Jiao Li , Guo-Jun Zhang , Jun Sun

金属学报(英文版) doi:10.1007/s40195-016-0375-4

An approach based on film buckling under simple uniaxial tensile testing was utilized in this paper to quantitatively estimate the interfacial energy of the nanostructured multilayer films (NMFs) adherent to flexible substrates. The interfacial energies of polyimide-supported NMFs are determined to be ~5.0 J/m² for Cu/Cr, ~4.1 J/m² for Cu/Ta, ~2.8 J/m² for Cu/Mo, ~1.1 J/m² for Cu/Nb, and ~1.2 J/m² for Cu/Zr NMFs. Furthermore, a linear relationship between the adhesion energy and the interfacial shear strength is clearly demonstrated for the Cu-based NMFs, which is highly indicative of the applicability and reliability of the modified models.

关键词: niaxial , tensile , testing , Nanostructured , multilayer , films , Flexible , substrates , Buckling , behaviors , Adhesion , energy

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Layer Thickness-Dependent Hardness and Strain Rate Sensitivity of Cu-Al/Al Nanostructured Multilayers

An Easy Way to Quantify the Adhesion Energy of Nanostructured Cu/X (X = Cr, Ta, Mo, Nb, Zr) Multilayer Films Adherent to Polyimide Substrates

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