Inhomogeneous plastic flow investigated by X-ray absorption microtomography of an aluminium alloy containing marker particles.
By combining a synchrotron X-ray source and the microtomography technique, the displacement gradient tensor components can be measured directly throughout the volume of a metal sample containing highly absorbing marker particles to detect material flow. The present article describes application of these techniques to compression of a rectangular Al-W specimen with a central hole. The results show that the externally imposed axial displacement gradient is accommodated mainly in two 45 degrees shear bands passing through the hole. A simple deformation analysis provides insight into shear band formation.
Haldrup
K
K
Center for Fundamental Research, Risø National Laboratory, 4000 Roskilde, Denmark. kristoffer.haldrup@risoe.dk
Nielsen
S F
SF
Beckmann
F
F
Wert
J A
JA