Load partitioning during compressive loading of a Mg/MgB2 composite

M. L. Young; J. DeFouw; J. D. Almer; D. C. Dunand

doi:10.1016/j.actamat.2007.01.046

Load partitioning during compressive loading of a Mg/MgB₂ composite

M. L. Young, J. DeFouw, J. D. Almer, D. C. Dunand^*

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

48 Scopus citations

Abstract

A composite, consisting of 68 vol.% superconducting continuous MgB₂ fibers aligned within a ductile Mg matrix, was loaded in uniaxial compression and the volume-averaged lattice strains in the matrix and fiber were measured in situ by synchrotron X-ray diffraction as a function of applied stress. In the elastic range of the composite, both phases exhibit the same strain, indicating that the matrix is transferring load to the fibers according to a simple iso-strain model. In the plastic range of the composite, the matrix is carrying proportionally less load. Plastic load transfer from matrix to fibers is complex due to presence in the fibers of a stiff WB₄ core and of cracks produced during the in situ synthesis of the MgB₂ fibers from B fibers. Also, load transfer behavior was observed to be different in bulk and near-surface regions, indicating that surface measurements are prone to error.

Original language	English (US)
Pages (from-to)	3467-3478
Number of pages	12
Journal	Acta Materialia
Volume	55
Issue number	10
DOIs	https://doi.org/10.1016/j.actamat.2007.01.046
State	Published - Jun 2007

Funding

This research was partially supported by the National Science Foundation through Grant No. DMR-0233805. The authors thank Dr. D.R. Haeffner (Argonne National Laboratory, ANL) for numerous useful discussions and Drs. W.K. Lee and K. Fezzaa (ANL) for assistance with radiographic imaging. Use of the Advanced Photon Source at ANL was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-CH11357.

Keywords

Internal stresses
Metal matrix composites
Superconductors
Synchrotron radiation
X-ray diffraction

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

Access to Document

10.1016/j.actamat.2007.01.046

Cite this

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title = "Load partitioning during compressive loading of a Mg/MgB2 composite",

abstract = "A composite, consisting of 68 vol.% superconducting continuous MgB2 fibers aligned within a ductile Mg matrix, was loaded in uniaxial compression and the volume-averaged lattice strains in the matrix and fiber were measured in situ by synchrotron X-ray diffraction as a function of applied stress. In the elastic range of the composite, both phases exhibit the same strain, indicating that the matrix is transferring load to the fibers according to a simple iso-strain model. In the plastic range of the composite, the matrix is carrying proportionally less load. Plastic load transfer from matrix to fibers is complex due to presence in the fibers of a stiff WB4 core and of cracks produced during the in situ synthesis of the MgB2 fibers from B fibers. Also, load transfer behavior was observed to be different in bulk and near-surface regions, indicating that surface measurements are prone to error.",

keywords = "Internal stresses, Metal matrix composites, Superconductors, Synchrotron radiation, X-ray diffraction",

author = "Young, {M. L.} and J. DeFouw and Almer, {J. D.} and Dunand, {D. C.}",

note = "Funding Information: This research was partially supported by the National Science Foundation through Grant No. DMR-0233805. The authors thank Dr. D.R. Haeffner (Argonne National Laboratory, ANL) for numerous useful discussions and Drs. W.K. Lee and K. Fezzaa (ANL) for assistance with radiographic imaging. Use of the Advanced Photon Source at ANL was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-CH11357. ",

year = "2007",

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doi = "10.1016/j.actamat.2007.01.046",

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AU - Young, M. L.

AU - DeFouw, J.

AU - Almer, J. D.

AU - Dunand, D. C.

N1 - Funding Information: This research was partially supported by the National Science Foundation through Grant No. DMR-0233805. The authors thank Dr. D.R. Haeffner (Argonne National Laboratory, ANL) for numerous useful discussions and Drs. W.K. Lee and K. Fezzaa (ANL) for assistance with radiographic imaging. Use of the Advanced Photon Source at ANL was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-CH11357.

PY - 2007/6

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N2 - A composite, consisting of 68 vol.% superconducting continuous MgB2 fibers aligned within a ductile Mg matrix, was loaded in uniaxial compression and the volume-averaged lattice strains in the matrix and fiber were measured in situ by synchrotron X-ray diffraction as a function of applied stress. In the elastic range of the composite, both phases exhibit the same strain, indicating that the matrix is transferring load to the fibers according to a simple iso-strain model. In the plastic range of the composite, the matrix is carrying proportionally less load. Plastic load transfer from matrix to fibers is complex due to presence in the fibers of a stiff WB4 core and of cracks produced during the in situ synthesis of the MgB2 fibers from B fibers. Also, load transfer behavior was observed to be different in bulk and near-surface regions, indicating that surface measurements are prone to error.

AB - A composite, consisting of 68 vol.% superconducting continuous MgB2 fibers aligned within a ductile Mg matrix, was loaded in uniaxial compression and the volume-averaged lattice strains in the matrix and fiber were measured in situ by synchrotron X-ray diffraction as a function of applied stress. In the elastic range of the composite, both phases exhibit the same strain, indicating that the matrix is transferring load to the fibers according to a simple iso-strain model. In the plastic range of the composite, the matrix is carrying proportionally less load. Plastic load transfer from matrix to fibers is complex due to presence in the fibers of a stiff WB4 core and of cracks produced during the in situ synthesis of the MgB2 fibers from B fibers. Also, load transfer behavior was observed to be different in bulk and near-surface regions, indicating that surface measurements are prone to error.

KW - Internal stresses

KW - Metal matrix composites

KW - Superconductors

KW - Synchrotron radiation

KW - X-ray diffraction

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