Yield behavior beneath hardness indentations in ductile metals, measured by three-dimensional computed X-ray tomography and digital volume correlation

Plastic deformation in the vicinity of hardness indentations in two ductile metals, an aluminium–silicon carbide composite (Al–SiC) and a cast magnesium alloy (WE43), was characterized. Using in situ and ex situ X-ray computed tomography with digital volume correlation, the three-dimensional full-fi...

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Bibliographic Details
Published in:Acta materialia 2015-01, Vol.82, p.468-482
Main Authors: Mostafavi, M., Collins, D.M., Cai, B., Bradley, R., Atwood, R.C., Reinhard, C., Jiang, X., Galano, M., Lee, P.D., Marrow, T.J.
Format: Article
Language:English
Subjects:
Computed tomography
Correlation analysis
Digital
Digital image correlation
Finite element analysis
Hardness
Indentation
Magnesium base alloys
Mathematical models
Three dimensional
Tomography
X-rays
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Summary:Plastic deformation in the vicinity of hardness indentations in two ductile metals, an aluminium–silicon carbide composite (Al–SiC) and a cast magnesium alloy (WE43), was characterized. Using in situ and ex situ X-ray computed tomography with digital volume correlation, the three-dimensional full-field displacements beneath the indentations were measured; these show strong agreement with simulated predictions using finite element models. It is demonstrated that plastic material properties, i.e. yield stress and hardening exponent, may be extracted via analysis of the deformation field.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2014.08.046