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Now showing items 17 - 32 of 23965

  • A novel approach to extracting hardness of copper/niobium (Cu/Nb) multilayer films by removing the substrate effect

    Qiu, Y. H.   Bai, Q.   Fu, E. G.   Wang, P. P.   Du, J. L.   Chen, X. F.   Xue, J. M.   Wang, Y. G.   Wang, X. J.  

    This article presents a novel method to eliminate the substrate effect in soft thin film on hard substrate by correcting the projected contact area in nanoindentation test. The hardness of sputtered Cu/Nb multilayer films on silicon substrate with different individual layer thickness was measured by nanoindentation in continuous stiffness mode (CSM) and was shown to be influenced by both indentation size effect (ISE) and substrate effect. Finite element modeling (FEM) and atomic force microscope (AFM) were used to investigate the influence of substrate to the hardness measurement, and the results showed that the hardness deviation induced by the substrate effect resulted from the pile-up can be reasonably removed. Silicon substrate was found to be crucial for the pile-up formation, as the vertical plastic flow of soft Cu/Nb film was restrained by hard silicon substrate with the increase of indentation depth. After applying our pile-up correction and revised Nix-Gao fitting, the hardness curves show a depth independent relation, which fulfills the requirement for accurate hardness measurement. We showed that the hardness deviation due to pile-up is about 14%. Meanwhile, some vague issues like the plateau region and "one-tenth rule" applied in many studies were discussed and clarified basing on our experimental and modeling results. The correcting methods and simulation results could be instructive and significant for nanoindentation hardness test of similar soft film on hard substrate system.
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  • Irradiation damage of single crystal, coarse-grained, and nanograined copper under helium bombardment at 450 degrees C

    Han, Weizhong   Fu, E. G.   Demkowicz, Michael J.   Wang, Yongqiang   Misra, Amit  

    The irradiation damage behaviors of single crystal (SC), coarse-grained (CG), and nanograined (NG) copper (Cu) films were investigated under Helium (He) ion implantation at 450 degrees C with different ion fluences. In irradiated SC films, plenty of cavities are nucleated, and some of them preferentially formed on growth defects or dislocation lines. In the irradiated CG Cu, cavities formed both in grain interior and along grain boundaries; obvious void-denuded zones can be identified near grain boundaries. In contrast, irradiation-induced cavities in NG Cu were observed mainly gathering along grain boundaries with much less cavities in the grain interiors. The grains in irradiated NG Cu are significantly coarsened. The number density and average radius of cavities in NG Cu was smaller than that in irradiated SC Cu and CG Cu. These experiments indicate that grain boundaries are efficient sinks for irradiation-induced vacancies and highlight the important role of reducing grain size in suppressing radiation-induced void swelling.
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  • Interface-enhanced defect absorption between epitaxial anatase TiO(2) film and single crystal SrTiO(3) RID E-9152-2010

    Zhuo, M. J.   Fu, E. G.   Yan, L.   Wang, Y. Q.   Zhang, Y. Y.   Dickerson, R. M.   Uberuaga, B. P.   Misra, A.   Nastasi, M.   Jia, Q. X.  

    The microstructural evolution of Ne-ion-irradiated anatase TiO(2)/SrTiO(3) films was investigated. A defect denuded layer formed in the TiO(2) film near the TiO(2)/SrTiO(3) interface after irradiation. The accumulation of defects at the TiO(2)/SrTiO(3) interface led to the formation of a continuous interfacial amorphous layer on SrTiO(3). Both observations are attributed to the interaction of defects with the interface. Present results reveal that a hetero-epitaxial interface between two different oxides can act as an effective sink to absorb irradiation-induced defects. Published by Elsevier Ltd. on behalf of Acta Materialia Inc.
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  • Brückenbauen mit neuen Werkstoffen: Die Fu?g?ngerbrücke über die Bayerstra?e in München

    Christoph Ackermann  

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  • ?Zeigt her Eure Fü?e!“

    Janosch Kuno  

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  • Pflege für beanspruchte Fü?e

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  • Fu?g?ngerbrücken

    Keil   Andreas  

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  • Kalte Fü?e . . .

    Fanta   S.  

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  • Belegarztwesen auf neue Fü?e stellen

    wha  

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  • Periphere Polyneuropathie – Stumme Fü?e

    Sch?dler   Stefan  

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  • Stumme Fü?e – Periphere Polyneuropathie

    Sch?dler   Stefan  

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  • Integrierte Bewertung aktiver Fu?g?ngerschutzsysteme

    Raudszus, Dominik   Hamacher, Michael   Zlocki, Adrian   Eckstein, Lutz  

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  • Gepflegte Fü?e

    Welzel   Birgit  

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  • Erleichterung für trockene und empfindliche Fü?e

    red  

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  • Versorgung diabetischer Fü?e: Telemedizin im Fokus

    Katja Hodeck  

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  • Sch?ne Grü?e an die Fü?e

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