Materials Transactions Online

Materials Transactions, Vol.47 No.03 (2006) pp.817-821
© 2006 The Japan Institute of Metals

Shear-Band Deformation in Amorphous Alloys and Composites

Cang Fan1, Laszlo Kecskes2, Tong Jiao3, Hahn Choo1,4, Akihisa Inoue5 and Peter Liaw1

1Department of Materials Science and Engineering, the University of Tennessee, Knoxville, TN 37916, USA
2US Army Research Laboratory, Aberdeen Proving Ground, MD 21005, USA
3Division of Engineering, Brown University, Providence, RI 02912, USA
4Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
5Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

The deformation of monolithic bulk-metallic glasses (BMGs), nanocrystal-containing, and micrometer-sized, ductile-particle-reinforced bulk metallic glass composites (BMGCs) has been investigated. The number density of shear bands, the interaction of shear bands with the particles, as well as the apparent plasticity was found to be significantly different in three types of samples before failure occurred. The interaction of shear bands with the micrometer-sized particles implied that shear bands can be initiated by stress concentration at the particle boundaries and, at the same time, absorbed by the deformation of particles. It is hypothesized that the observed number density and motion of shear bands could arise from the interaction of rotational sliding of medium range order (MRO) or dense-packed clusters, fine crystals, and the free volume in the material. An estimate of the shear band thickness, based on the size of particles or grains near and in the shear bands of the BMGs, BMGCs, and ultra-fine structured materials is consistent with this conjecture.

(Received 2005/8/17; Accepted 2006/1/12; Published 2006/3/15)

Keywords: bulk metallic glasses, shear bands, structures, composites, deformation

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