Microstructural investigations of an ultrafine eutectic Fe83 Ti7 Zr6 B4 alloy reveal that spherical eutectic colonies are composed of nanoeutectic areas which are encapsulated by submicron eutectic areas indicating length-scale heterogeneity of lamellar structure. Furthermore, formation of the wavy and discontinuous shear bands indicative of dissipation of the shear stress are possibly caused by a rotation of the eutectic colonies along the submicron eutectic areas during deformation, leading to developing typical dimples on the fracture surface. The rotation of the eutectic colonies containing the length-scale heterogeneity is proposed to be responsible for macroscopic plasticity of the ultrafine eutectic Fe83 Ti7 Zr6 B4 alloy.
Bibliographical noteFunding Information:
This work was supported by the Global Research Laboratory Program of Korea Ministry of Science and Technology. One of the authors (J. M. Park) acknowledges the support from the Second Stage of Brain Korea 21 Project in 2007.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)