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Search Publications by: Lyle E. Levine (Fed)

Displaying 176 - 200 of 269

Electron Transport in Gold Nanowires: Stable 1-, 2- and 3-Dimensional Atomic Structures and Non-Integer Conduction States

September 14, 2011

Author(s)

Francesca M. Tavazza, Douglas T. Smith, Lyle E. Levine, Jon R. Pratt, Anne M. Chaka

Experimental conductivity measurements made during highly stable tensile deformation of Au nanowires show a rich variety of behaviors, including non-integer quantum conductance plateaus, transitions and slopes. Using tight binding conductance calculations

Development of Ultrasmall-Angle X-ray Scattering - X-ray Photon Correlation Spectroscopy

February 1, 2011

Author(s)

Fan Zhang, Andrew J. Allen, Lyle E. Levine, Jan Ilavsky, Gabrielle G. Long, Anthony M. Santana

In this paper, we present the development of ultrasmall-angle X-ray scattering - X-ray photon correlation spectroscopy (USAXS-XPCS). This technique takes advantage of Bonse-Hart crystal optics and is capable of probing the slow equilibrium and

Structural changes during the formation of gold single atom chains: stability criteria and electronic structure

June 17, 2010

Author(s)

Francesca M. Tavazza, Lyle E. Levine, Anne M. Chaka

Under tensile deformation, Au nanowires (NWs) elongate to form single atom chains via a series of intermediate structural transformations. These intermediate structures are investigated using semistatic density functional theory (DFT), with particular

An Ultra-Stable Platform for the Study of Single-Atom Chains

May 16, 2010

Author(s)

Douglas T. Smith, Jon R. Pratt, Francesca M. Tavazza, Lyle E. Levine, Anne M. Chaka

We describe a surface probe instrument capable of sustaining single-atomic-bond junctions in the electronic quantum-conduction regime for tens of minutes, and present results for Au junctions that can be locked stably in n = 1 and n = 2 quantum conduction

The effect of thermal oxidation on laser-induced photoelectron emission during tensile deformation of polycrystalline aluminum

April 1, 2010

Author(s)

M Cai, S C. Langford, Richard E. Ricker, Lyle E. Levine, J T. Dickinson

Many metals emit electrons when exposed to UV radiation from excimer lasers (photon energies 4 eV to 8 eV). Deformation can significantly affect the intensity of these emissions. In the case of reactive metals, these emissions are also altered by the

Comment on "Mechanical heterogeneity and mechanism of plasticity in metallic glasses"

January 12, 2010

Author(s)

Lyle E. Levine

In a recently published letter by Wang et al.,1 the authors investigated the mechanical heterogeneity of three bulk metallic glasses with differing degrees of plasticity: brittle Fe41Co7Cr15Mo14C15B6Y2, highly plastic Zr64.13Cu15.75Ni10.12Al10 (ZrCuNiAl)

Elongation and breaking mechanisms of gold nanowires under a wide range of tensile conditions

August 27, 2009

Author(s)

Francesca Tavazza, Lyle E. Levine, Anne M. Chaka

Semistatic density functional theory is used to explore the evolution of [110] and [111] gold nanowires during tensile deformation under a wide range of conditions, including different tensile axes (along high- and low-symmetry directions), nanowire shapes

Ultra-small-angle X-ray scattering at the Advanced Photon Source

June 12, 2009

Author(s)

Pete R. Jemian, Jan Ilavsky, Andrew J. Allen, Fan Zhang, Lyle E. Levine, Gabrielle G. Long

The design and operation of a versatile ultra-small-angle X-ray scattering (USAXS) instrument at the Advanced Photon Source (APS) at Argonne National Laboratory are presented. The instrument is optimized for the high brilliance and low emittance of an APS

Finite-element analysis and experimental investigation of probe shape effect on initial plastic yield

March 3, 2009

Author(s)

Li Ma, Dylan Morris, Stefhanni Jennerjohn, David Bahr, Lyle E. Levine

Sudden displacement excursions during load-controlled nanoindentation of relatively dislocation-free surfaces of metals are frequently associated with dislocation nucleation, multiplication, and propagation. Insight into the nanomechanical origins of

Dislocation nucleation during nanoindentation of aluminum

December 8, 2008

Author(s)

Richard J. Wagner, Li Ma, Francesca M. Tavazza, Lyle E. Levine

Through multiscale simulations, we explore the influence of an atomically-rough indenter tip on the nucleation of dislocations during nanoindentation of single-crystal aluminum. We model the long-range strain with finite element analysis using anisotropic

A Hybrid, Quantum-Classical Approach for the Computation of Dislocation Properties in Real Materials: Method, Limitations and Applications

October 16, 2008

Author(s)

Francesca Tavazza, Lyle E. Levine, Anne M. Chaka

In this work we introduce a hybrid ab initio-classical simulation methodology designed to incorporate the chemistry into the description of phenomena that, intrinsically, require very large systems to be properly described. This hybrid approach allows us

A Statistical Connection Between Dislocations and Mechanical Properties

October 16, 2008

Author(s)

Lyle E. Levine, R M. Thomson

The extreme complexity of the dislocation-based processes that underlie plastic deformation are in marked contrast to the relatively simple behavior observed macroscopically. The simplification arises because a deforming metal can be described as a self

AFM Observations of Slip Band Development in AI Single Crystals

October 16, 2008

Author(s)

D E. Kramer, M Savage, Lyle E. Levine

In situ atomic force microscopy (AFM) is used to observe the structure and evolution of slip bands on the surface of plastically deformed aluminum single crystals. Both the structure and evolution of the slip bands are observed to be a function of the