Microstructural investigations of Fe56 Nb4 Al40 ultrafine eutectic-dendrite composite reveal that its high room temperature plasticity mainly originates from the evolution of slip in the dendrites and multiple shear banding in the ultrafine eutectic matrix, respectively. Here, we sequentially describe that the shear bands in the ultrafine eutectic matrix are propagated with generation of strain field in the soft alpha-Fe(Al) layers rather than passing through by sharp shear banding in the hard (Fe,Al)2 Nb intermetallic layers. Consequently, step morphologies at the interfaces of the alternating lamellae and the dendrite/eutectic matrix strongly support the effective accommodation of shear strain during shear band propagation.
Bibliographical noteFunding Information:
The authors are grateful to K. T. Kim, J. H. Na, T. E. Kim, E. Fleury, and M. H. Lee for valuable discussions. This work was supported by the Global Research Laboratory Program of the Korea Ministry of Science and Technology. J. M. Park and S. W. Sohn acknowledge the support from the Second Stage of Brain Korea 21 Project in 2007.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)