title: Quantitative Measurement of Density in a Shear Band of Metallic Glass Monitored Along its Propagation Direction.
abstract: Quantitative density measurements from electron scattering show that shear bands in deformed Al88Y7Fe5 metallic glass exhibit alternating high and low density regions, ranging from -9% to +6% relative to the undeformed matrix. Small deflections of the shear band from the main propagation direction coincide with switches in density from higher to lower than the matrix and vice versa, indicating that faster and slower motion (stick slip) occurs during the propagation. Nanobeam diffraction analyses provide clear evidence that the density changes are accompanied by structural changes, suggesting that shear alters the packing of tightly bound short- or medium-range atomic clusters. This bears a striking resemblance to the packing behavior in granular shear bands formed upon deformation of granular media.
authors.affiliation: Institut für Materialphysik, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 10, D-48149 Münster, Germany.
authors.forename: Vitalij
authors.initials: V
authors.lastname: Schmidt
authors.affiliation: Institut für Materialphysik, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 10, D-48149 Münster, Germany.
authors.forename: Harald
authors.initials: H
authors.lastname: Rösner
authors.affiliation: Institut für Materialphysik, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 10, D-48149 Münster, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Peterlechner
authors.affiliation: Institut für Materialphysik, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 10, D-48149 Münster, Germany.
authors.forename: Gerhard
authors.initials: G
authors.lastname: Wilde
authors.affiliation: Materials Science and Engineering, University of Wisconsin-Madison, 1509 University Ave, Madison, Wisconsin 53706, USA.
authors.forename: Paul M
authors.initials: PM
authors.lastname: Voyles