Size-dependent yield stress in twinned gold nanowires mediated by site-specific surface dislocation emission

Chuang Deng; Sansoz, Frederic
August 2009
Applied Physics Letters;8/31/2009, Vol. 95 Issue 9, p091914
Academic Journal
Large-scale molecular dynamics simulations were performed to demonstrate the synergistic effects of twin boundaries and free surfaces on dislocation emission in gold nanowires under tensile loading. It is revealed that the addition of nanoscale twins to crystalline nanowires can act to either increase or decrease their resistance to slip in tension, depending on both sample diameter and number of twins per unit length. Site-specific surface dislocation emission and image forces due to twin boundaries are used to explain the size-dependence of yield stress in twinned gold nanowires.


Related Articles

  • Geometric effects on the inelastic deformation of metal nanowires. Changjiang Ji; Park, Harold S. // Applied Physics Letters;10/30/2006, Vol. 89 Issue 18, p181916 

    This letter addresses the direct effect that geometry has in controlling the mechanisms of inelastic deformation in metal nanowires. By performing atomistic simulations of the tensile deformation of <100>/{100} hollow copper nanowires (nanoboxes), the authors find that the nanoboxes deform in an...

  • Calculation of the interaction energy of the twinning dislocations of a wedge twin based on the mesoscopic dislocation model. Ostrikov, O. // Journal of Engineering Physics & Thermophysics;Nov2009, Vol. 82 Issue 6, p1224 

    The energy of interaction of the twinning dislocations in a wedge crystal twin was calculated based on the mesoscopic dislocation model. It has been established that the interaction energy of the twinning dislocations increases moderately with increase in the length of the twin. It is shown that...

  • An Atomistic Perspective on Twinning Phenomena in Nano-enhanced fcc Metal. Sansoz, Frederic; Hanchen Huang; Warner, Derek H. // JOM: The Journal of The Minerals, Metals & Materials Society (TM;Sep2008, Vol. 60 Issue 9, p79 

    Twin boundaries exist in bulk metals, and they are even more common in metallic nanomaterials. Molecular simulation has made it possible to achieve a predictive understanding of the atomic mechanisms leading to the enhanced properties of nano-twinned metals. Taking nanowires as prototypes, this...

  • Deformation Nanostructuring and Superplastic Processing of Metallic Materials. Utyashev, Farid Z.; Mukhtarov, Shamil Kh. // Materials Science Forum;2016, Vol. 838/839, p355 

    Theoretical and practical aspects of fabrication and processing of bulk metallic nanomaterials are presented. The effect of different deformation modes on the structure formation is shown. Development of nanotechnology with respect to fabrication of gas turbine engines (GTE) parts made of...

  • Stressed state near a wedge-shaped twin with a disbalance of densities of twinning dislocations. Ostrikov, O. M. // Journal of Applied Mechanics & Technical Physics;Jul/Aug2002, Vol. 43 Issue 4, p638 

    The influence of disbalance of densities of twinning dislocations at the boundaries on the stressed state inside a wedge-shaped twin, near its top, and in external regions adjoining the twinning boundary is studied using a dislocation model.

  • Size Dependence of Dislocation-Mediated Plasticity in Ni Single Crystals: Molecular Dynamics Simulations. Xiaoyan Li; Wei Yang // Journal of Nanomaterials;2009, Special section p1 

    We investigate the compressive yielding of Ni single crystals by performing atomistic simulations with the sample diameters in the range of 5nm ∼ 40 nm. Remarkable effects of sample sizes on the yield strength are observed in the nanopillars with two different orientations. The deformation...

  • Constitutive Modeling of the Tensile Behavior of Al-TWIP Steel. Kim, Jinkyung; Estrin, Yuri; Beladi, Hossein; Timokhina, Ilana; Chin, Kwang-Geun; Kim, Sung-Kyu; De Cooman, Bruno // Metallurgical & Materials Transactions. Part A;Feb2012, Vol. 43 Issue 2, p479 

    High Mn steels demonstrate an exceptional combination of high strength and large ductility as a result of their high strain-hardening rate during deformation. The microstructure evolution and strain-hardening behavior of Fe18Mn0.6C1.5Al TWIP steel in uniaxial tension were examined. The purpose...

  • Modélisation du glissement cristallographique et du maclage dans le magnésium extrudé sous chargement cyclique. Guillemer, C.; Clavel, M.; Cailletaud, G. // Revue de Métallurgie;Dec2012, Vol. 109 Issue 6, p423 

    The present study aims at determining and modeling the mechanical behavior of pure extruded magnesium, especially under cyclic straining at room temperature. For this purpose, tensile, compressive and cyclic tests are performed (small plastic strains are applied, respectively Δεp/2 = 0.1%...

  • Pseudoelastic stacking fault and deformation twinning in nanocrystalline Ni. Li, B. Q.; Sui, M. L.; Mao, S. X. // Applied Physics Letters;12/13/2010, Vol. 97 Issue 24, p241912 

    It is usually believed that the partial dislocation and deformation twin are the results of permanent plasticity in materials. Here, we present in situ atomic-scale observation of reversible stacking fault and deformation twin during loading and unloading in nanocrystalline Ni under...


Read the Article


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

Try another library?
Sign out of this library

Other Topics