TITLE

Deformation twins in nanocrystalline Al

AUTHOR(S)
Liao, X.Z.; Zhou, F.; Lavernia, E.J.; He, D.W.; Zhu, Y.T.
PUB. DATE
December 2003
SOURCE
Applied Physics Letters;12/15/2003, Vol. 83 Issue 24, p5062
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Due to its high stacking fault energy, no deformation twin has ever been observed in coarse-grained Al. Recent molecular dynamic (MD) simulations predicted the formation of deformation twins in nanocrystalline (nc) Al. Here, we report transmission-electron-microscopic observations of two types of twins in nc Al processed by cryogenic ball milling. They were formed via mechanisms suggested by the MD simulations. We also observed curved twin boundaries caused by partial dislocations. These results indicate that deformation mechanisms not accessible to coarse-grained Al are active in nc Al. They could be responsible for some unique mechanical properties of nc materials. © 2003 American Institute of Physics.
ACCESSION #
11649637

 

Related Articles

  • Size effect on the oxidation of aluminum nanoparticle: Multimillion-atom reactive molecular dynamics simulations. Li, Ying; Kalia, Rajiv K.; Nakano, Aiichiro; Vashishta, Priya // Journal of Applied Physics;Oct2013, Vol. 114 Issue 13, p134312 

    The size effect in the oxidation of aluminum nanoparticles (Al-NPs) has been observed experimentally; however, the mechano-chemistry and the atomistic mechanism of the oxidation dynamics remain elusive. We have performed multimillion atom reactive molecular dynamics simulations to investigate...

  • Phase boundary effects on the mechanical deformation of core/shell Cu/Ag nanoparticles. Bin Zheng; Yi Nong Wang; Min Qi; Williams, Elissa H. // Journal of Materials Research;Jul2009, Vol. 24 Issue 7, p6 

    The uniaxial compressive deformation of core/shell-type Cu/Ag nanoparticles and naked Cu nanoparticles were simulated by molecular dynamics, revealing the role of nanophase boundaries in the mechanical deformation. The simulations show that single type of partial dislocations glide across the...

  • Nanoindentation of NiAl and Ni3Al crystals on (100), (110), and (111) surfaces: A molecular dynamics study. Seymour, Richard; Hemeryck, Anne; Ken-ichi Nomura; Weiqiang Wang; Kalia, Rajiv K.; Aiichiro Nakano; Vashishta, Priya // Applied Physics Letters;4/7/2014, Vol. 104 Issue 14, p1 

    Molecular dynamics simulations were performed to study the nanoindentation of NiAl and Ni3Al crystals on three surfaces: (100), (110), and (111). The calculated load-displacement curves show discrete drops at certain indentation depths, indicating dislocation bursts during indentation. The...

  • Dynamic strength of metals in shock deformation. Kubota, Alison; Reisman, David B.; Wolfer, Wilhelm G. // Applied Physics Letters;6/12/2006, Vol. 88 Issue 24, p241924 

    The Hugoniot and critical shear strength of shock-compressed metals can be obtained directly from molecular dynamics simulations without recourse to surface velocity profiles and their analyses. Results from simulations in aluminum containing an initial distribution of microscopic defects are...

  • Dynamic fracture kinetics, influence of temperature and microstructure in the atomistic model of aluminum. Kuksin, Alexey; Norman, Genri; Stegailov, Vladimir; Yanilkin, Alexey; Zhilyaev, Petr // International Journal of Fracture;Mar2010, Vol. 162 Issue 1/2, p127 

    Microscopic mechanisms and kinetics of dynamic fracture of crystalline materials are analyzed. The work is based on the molecular dynamics modeling and simulation within the embedded atom method model for interatomic interactions in metals. An attempt is made to present the results of molecular...

  • Molecular dynamics simulations of mechanical deformation of amorphous silicon dioxide during chemical-mechanical polishing. Chagarov, Evgueni; Adams, James B. // Journal of Applied Physics;9/15/2003, Vol. 94 Issue 6, p3853 

    Presents molecular dynamics simulations of the mechanical deformation which occurs during chemical-mechanical polishing of amorphous silicon dioxide for different geometries and relative velocities. Clarification of asperity shape evolution during the process of shear and revelation of...

  • Shear induced deformation of polymers: Calculation of radii of gyration. Wang, Shi-Qing // Journal of Chemical Physics;6/15/1990, Vol. 92 Issue 12, p7618 

    By calculating radii of gyration of a Gaussian polymer chain in simple shear flow, we study the deformed shape of an isolated macromolecule. To order ε≡4-d (d=spatial dimensionality) and to the lowest nontrivial order in the shear rate, we consider the effect of hydrodynamic...

  • A Molecular Dynamics Study of the Effect of Voids on the Deformation Behavior of Nanocrystalline Copper. Chen Zheng; Yong-Wei Zhan // Journal of Nanomaterials;2007 Regular Issue, p1 

    Molecular dynamics simulations are performed to study the effect of preexisting ellipsoidal voids on the tensile deformation behavior in nanocrystalline copper. No crack propagation is observed regardless of the orientation of the voids with respect to the tensile direction. However it is found...

  • Radiation induced effects on mechanical properties of nanoporous gold foams. Caro, M.; Mook, W. M.; Fu, E. G.; Wang, Y. Q.; Sheehan, C.; Martinez, E.; Baldwin, J. K.; Caro, A. // Applied Physics Letters;6/9/2014, Vol. 104 Issue 23, p1 

    It has recently been shown that due to a high surface-to-volume ratio, nanoporous materials display radiation tolerance. The abundance of surfaces, which are perfect sinks for defects, and the relation between ligament size, defect diffusion, and time combine to define a window of radiation...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

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

Try another library?
Sign out of this library

Other Topics