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Synchrotron radiography studies of shear-induced dilation in semi-solid Al alloys and steels

Gourlay, C. M., O'Sullivan, C., Fonseca, J., Yuan, L., Kareh, K., Nagira, T. and Yasuda, H. (2014). Synchrotron radiography studies of shear-induced dilation in semi-solid Al alloys and steels. JOM: Journal of the Minerals, Metals and Materials Society, 66(8), pp. 1415-1424. doi: 10.1007/s11837-014-1029-5

Abstract

An improved understanding of the response of solidifying microstructures to load is required to further minimize casting defects and optimize casting processes. This article overviews synchrotron radiography studies that directly measure the micromechanics of semisolid alloy deformation in a thin sample direct-shear cell. It is shown that shear-induced dilation (also known as Reynolds’ dilatancy) occurs in semisolid alloys with morphologies ranging from equiaxed-dendritic to globular, at solid fractions from the dendrite coherency point to ~90% solid, and it occurs in both Al alloys and carbon steels. Discrete-element method simulations that treat solidifying microstructures as granular materials are then used to explore the origins of dilatancy in semisolid alloys.

Publication Type: Article
Additional Information: The final publication is available at Springer via http://dx.doi.org/10.1007/s11837-014-1029-5
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: School of Mathematics, Computer Science & Engineering > Engineering
URI: http://openaccess.city.ac.uk/id/eprint/3933
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