Deformation twinning during nanoindentation of nanocrystalline Ta

Wang, Y. M.; Hodge, A. M.; Biener, J.; Hamza, A. V.; Barnes, D. E.; Liu, Kai; Nieh, T. G.
March 2005
Applied Physics Letters;3/7/2005, Vol. 86 Issue 10, p101915
Academic Journal
The deformation mechanism of body-centered cubic (bcc) nanocrystalline tantalum with grain sizes of 10–30 nm is investigated by nanoindentation, scanning electron microscopy and high-resolution transmission electron microscopy. In a deviation from molecular dynamics simulations and existing experimental observations on other bcc nanocrystalline metals, the plastic deformation of nanocrystalline Ta during nanoindentation is controlled by deformation twinning. The observation of multiple twin intersections suggests that the physical mechanism of deformation twinning in bcc nanocrystalline materials is different from that in face-centered cubic (fcc) nanocrystalline metals.


Related Articles

  • Atomically smooth and single crystalline Ge(111)/cubic-Pr2O3(111)/Si(111) heterostructures: Structural and chemical composition study. Giussani, A.; Rodenbach, P.; Zaumseil, P.; Dabrowski, J.; Kurps, R.; Weidner, G.; Müssig, H.-J.; Storck, P.; Wollschläger, J.; Schroeder, T. // Journal of Applied Physics;Feb2009, Vol. 105 Issue 3, pN.PAG 

    Engineered wafer systems are an important materials science approach to achieve the global integration of single crystalline Ge layers on the Si platform. Here, we report the formation of single crystalline, fully relaxed Ge(111) films by molecular beam epitaxial overgrowth of cubic Pr oxide...

  • Structure and optical properties of cored wurtzite (Zn,Mg)O heteroepitaxial nanowires. Heo, Y. W.; Abernathy, C.; Pruessner, K.; Sigmund, W.; Norton, D. P.; Overberg, M.; Ren, F.; Chisholm, M.F // Journal of Applied Physics;9/15/2004, Vol. 96 Issue 6, p3424 

    The synthesis, structure, and optical properties of one-dimensional heteroepitaxial cored (Zn,Mg)O semiconductor nanowires grown by a catalyst-driven molecular beam epitaxy technique are discussed. The structures form spontaneously in a Zn, Mg and O2/O3 flux, consisting of a single crystal,...

  • Transient and steady state CO oxidation kinetics on nanolithographically prepared supported Pd model catalysts: Experiments and simulations. Laurin, M.; Johánek, V.; Grant, A. W.; Kasemo, B.; Libuda, J.; Freund, H.-J. // Journal of Chemical Physics;8/1/2005, Vol. 123 Issue 5, p054701 

    Applying molecular-beam methods to a nanolithographically prepared planar Pd/SiO2 model catalyst, we have performed a detailed study of the kinetics of CO oxidation. The model catalyst was prepared by electron-beam lithography, allowing individual control of particle size and position. The...

  • Phosphorus Accumulation in Lake Sediments during the Last 14,000 Years: Description by Fractionation Techniques and X-Ray Micro-Analysis. Selig, U.; Fischer, K.; Leipe, Th. // Journal of Freshwater Ecology;Jun2005, Vol. 20 Issue 2, p347 

    Surface sediment and deep cores from three lakes in northern Germany, representing deposition during the last 4,000 to 14,000 years, were analyzed. Concentrations of organic carbon, phosphorus, iron, manganese, and aluminium were determined to reflect nutrient accumulation. Sequential chemical...

  • Study of cleanliness and castability in Ti-stabilized ultra low carbon steels using automated SEM inclusion analysis. S.-R. Story; G.-E. Goldsmith; G.-L. Klepzig // Revue de Métallurgie;May2008, Vol. 2008 Issue 5, p272 

    Titanium-stabilized ultra-low carbon steels are often used in surfacequality critical applications and also susceptible to clogging problems in the casting process. The Automated Steel Cleanliness Analysis Tool (ASCATTM), based on computer-controlled scanning electron microscopy, was used to...

  • Synthesis of C—N nanotube blocks and Y-junctions in bamboo-like C—N nanotubes. Dinesh Singh; T. Shripathi; O. Srivastava // Journal of Nanoparticle Research;Dec2008, Vol. 10 Issue 8, p1349 

    Abstract  We report the observations made on the synthesis and characterization of C–N nanotube blocks and Y-junctions in bamboo-like C–N nanotubes. The C–N nanotube Blocks have been synthesized by pyrolyzing the mixture of silver nitrate acetonitrile solution and...

  • Local Synthesis of Carbon Nanotubes in Silicon Microsystems: The Effect of Temperature Distribution on Growth Structure. Ta, Bao Q.; Haugen, Tormod B.; Hoivik, Nils; Halvorsen, Einar; Aasmundtveit, Knut E. // Materials (1996-1944);Aug2013, Vol. 6 Issue 8, p3160 

    Local synthesis and direct integration of carbon nanotubes (CNTs) into microsystems is a promising method for producing CNT-based devices in a single step, low-cost, and wafer-level, CMOS/MEMS-compatible process. In this report, the structure of the locally grown CNTs are studied by transmission...

  • The effects of plasma-processing conditions on the morphology of adherent human blood platelets. Murugesan, R.; Hanley, E.; Albrecht, R. M.; Oliver, J. A.; Heintz, J. A.; Lauer, J. L.; Shohet, J. L. // Journal of Applied Physics;May2008, Vol. 103 Issue 9, p093302 

    Hematocompatibility and nonfouling properties of materials are crucial for the development of small-scale biomedical devices. This study examines the adhesion and morphology of purified human platelets on plasma-polymerized tetraglyme-coated glass substrates. The effect of varying the...

  • Highly Enhanced Green Photoluminescence of as-Anodized n-type Porous GaAs. Ali, N. K.; Hashim, M. R.; Aziz, A. A.; Hassan, H. A. // AIP Conference Proceedings;Mar2010, Vol. 1217 Issue 1, p348 

    Porous GaAs films have been prepared by electrochemical anodic etching of n-GaAs in HF based electrolyte at different current densities. The porous nature of the samples has been observed by scanning electron microscopy (SEM). The nanostructure nature of the porous layer has been demonstrated by...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics