Mapping of residual strains around a shear band in bulk metallic glass by nanobeam X-ray diffraction. (1st June 2016)

• Record Type: Journal Article
• Authors: Shakur Shahabi, Hamed; Scudino, Sergio; Kaban, Ivan; Stoica, Mihai; Escher, Benjamin; Menzel, Siegfried; B.M. Vaughan, Gavin; Kühn, Uta; Eckert, Jürgen
• Is Part Of: Acta materialia. Volume 111(2016)
• Page Start: 187
• Page End: 193
• Publication Date: 2016-06-01
• Subjects: Bulk metallic glass -- X-ray diffraction -- Shear band -- Atomic structure -- Pair distribution function; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2016.03.035
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: Despite recent progress in understanding the outstanding role of shear bands in plastic deformation of metallic glasses, the details of structural changes in the shear-induced zone is not yet known. In order to probe such changes, we determined the distribution of residual strains at short- and medium-range order around a single shear band in cold-rolled Vit105 bulk metallic glass using a nano-focused high energy X-ray beam. Plastic deformation results in significant residual normal and shear strains at distances of more than 15 μm around the shear band. Based on a detailed analysis of the distribution profile, the magnitude and the direction of the residual shear strain, it is suggested that the shear strain plays a dominant role, compared to the normal strains, for triggering nucleation of further shear bands from a mature shear band. Graphical abstract: