Residual elastic strain induced by equal channel angular pressing on bulk metallic glasses

We performed equal channel angular pressing (ECAP) on bulk metallic glasses with the composition of (La0.5Ce0.5)65Co25Al10 and Zr52.5Cu17.9Ni14.6Al10Ti5. The analysis of the high energy X-ray diffraction patterns indicates that anisotropic strain is present in the processed samples. We also determin...

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Bibliographic Details
Published in:Acta materialia 2013-02, Vol.61 (4), p.1204-1209
Main Authors: Tong, Y., Dmowski, W., Witczak, Z., Chuang, C.-P., Egami, T.
Format: Article
Language:English
Subjects:
Applied sciences
Bulk metallic glasses
Equal channel angular pressing
Exact sciences and technology
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Plastic deformation
Shear bands
X-ray diffraction
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Summary:We performed equal channel angular pressing (ECAP) on bulk metallic glasses with the composition of (La0.5Ce0.5)65Co25Al10 and Zr52.5Cu17.9Ni14.6Al10Ti5. The analysis of the high energy X-ray diffraction patterns indicates that anisotropic strain is present in the processed samples. We also determined the nature and magnitude of strain in the sample after thermo-mechanical creep, i.e. after homogenous deformation. Comparison between diffraction patterns indicates that the strain anisotropy in the ECAP processed samples is due to an elastic strain and is not induced by bond anisotropy as in creep samples. We conclude that the apparent elastic strain is brought on by a residual stress originating from the shear bands and that the deformation in ECAP experiment is inherently inhomogeneous.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2012.10.030