skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Structural aspects of elastic deformation of a metallic glass

Abstract

We report the use of high-energy x-ray scattering to measure strain in a Zr{sub 57}Ti{sub 5}Cu{sub 20}Ni{sub 8}Al{sub 10} bulk metallic glass in situ during uniaxial compression in the elastic regime up to stresses of approximately 60% of the yield stress. The strains extracted in two ways--directly from the normalized scattering data and from the pair correlation functions--are in good agreement with each other for length scales greater than 4 A. The elastic modulus calculated on the basis of this strain is in good agreement with that reported for closely related amorphous alloys based on macroscopic measurements. The strain measured for atoms in the nearest-neighbor shell, however, is smaller than that for more distant shells, and the effective elastic modulus calculated from the strain on this scale is therefore larger, comparable to crystalline alloys of similar composition. These observations are in agreement with previously proposed models in which the nominally elastic deformation of a metallic glass has a significant anelastic component due to atomic rearrangements in topologically unstable regions of the structure. We also observe that the distribution of the atomic-level stresses in the glass becomes more uniform during loading. This implies that the stiffness of metallic glasses may havemore » an entropic contribution, analogous to the entropic contribution in rubber elasticity.« less

Authors:
; ;  [1];  [2]
  1. Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218-2681 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
20787897
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 73; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevB.73.064204; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINIUM ALLOYS; ATOMS; COPPER ALLOYS; CORRELATION FUNCTIONS; DEFORMATION; DISTRIBUTION; ELASTICITY; FLEXIBILITY; METALLIC GLASSES; NICKEL ALLOYS; STRAINS; STRESSES; TITANIUM ALLOYS; X-RAY DIFFRACTION; ZIRCONIUM ALLOYS

Citation Formats

Hufnagel, T. C., Ott, R. T., Almer, J., and Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439. Structural aspects of elastic deformation of a metallic glass. United States: N. p., 2006. Web. doi:10.1103/PHYSREVB.73.0.
Hufnagel, T. C., Ott, R. T., Almer, J., & Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439. Structural aspects of elastic deformation of a metallic glass. United States. doi:10.1103/PHYSREVB.73.0.
Hufnagel, T. C., Ott, R. T., Almer, J., and Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439. Wed . "Structural aspects of elastic deformation of a metallic glass". United States. doi:10.1103/PHYSREVB.73.0.
@article{osti_20787897,
title = {Structural aspects of elastic deformation of a metallic glass},
author = {Hufnagel, T. C. and Ott, R. T. and Almer, J. and Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439},
abstractNote = {We report the use of high-energy x-ray scattering to measure strain in a Zr{sub 57}Ti{sub 5}Cu{sub 20}Ni{sub 8}Al{sub 10} bulk metallic glass in situ during uniaxial compression in the elastic regime up to stresses of approximately 60% of the yield stress. The strains extracted in two ways--directly from the normalized scattering data and from the pair correlation functions--are in good agreement with each other for length scales greater than 4 A. The elastic modulus calculated on the basis of this strain is in good agreement with that reported for closely related amorphous alloys based on macroscopic measurements. The strain measured for atoms in the nearest-neighbor shell, however, is smaller than that for more distant shells, and the effective elastic modulus calculated from the strain on this scale is therefore larger, comparable to crystalline alloys of similar composition. These observations are in agreement with previously proposed models in which the nominally elastic deformation of a metallic glass has a significant anelastic component due to atomic rearrangements in topologically unstable regions of the structure. We also observe that the distribution of the atomic-level stresses in the glass becomes more uniform during loading. This implies that the stiffness of metallic glasses may have an entropic contribution, analogous to the entropic contribution in rubber elasticity.},
doi = {10.1103/PHYSREVB.73.0},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 6,
volume = 73,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2006},
month = {Wed Feb 01 00:00:00 EST 2006}
}