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Synchrotron Strain Measurements for in situ Formed Metallic Glass Matrix Composites

Published online by Cambridge University Press:  01 February 2011

R. T. Ott ,
F. Sansoz ,
J. F. Molinari ,
J. Almer ,
C. Fan  and
T. C. Hufnagel
R. T. Ott
Affiliation:
Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21209
F. Sansoz
Affiliation:
Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21209
J. F. Molinari
Affiliation:
Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21209
J. Almer
Affiliation:
Argonne National Laboratory, Advanced Photon Source, Argonne, IL 60439
C. Fan
Affiliation:
Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21209
T. C. Hufnagel
Affiliation:
Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21209
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Abstract

We have examined the micromechanical behavior of in situ formed metallic glass composites by performing in situ high-energy synchrotron X-ray scattering during uniaxial compression. The load partitioning between the amorphous matrix and the reinforcing particles was examined by measuring the lattice strains in the crystalline particles during compressive loading. The crystalline particles yield in compression during loading followed by tensile yielding during unloading. The large elastic mismatch between the two phases leads to large residual strains after each loading cycle. The load partitioning was also examined with finite element modeling (FEM). The predicted von Mises effective stress in the crystalline particles from the FEM calculations compares well with the experimentally determined von Mises effective stress so long as the deformation is elastic in both particles and matrix. After the particles yield, the model predicts strain hardening of the particles that is not observed experimentally.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 806: Symposium MM – Amorphous and Nanocrystalline Metals , 2003 , MM8.12
Copyright
Copyright © Materials Research Society 2004

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