In this work, we examine the microstructural development of a bimetal multilayered composite over a broad range of individual layer thicknesses h from microns to nanometers during deformation. We observe two microstructural transitions, one at the submicron scale and another at the nanoscale. Remarkably, each transition is associated with the development of a preferred interface character. We show that the characteristics of these prevailing interfaces are strongly influenced by whether the adjoining crystals are deforming by slip only or by slip and twinning. We present a generalized theory that suggests that, in spite of their different origins, the crystallographic stability of their interface character with respect to deformation depends on the same few basic variables.
Bibliographical noteFunding Information:
The authors gratefully acknowledge support by the Center for Materials at Irradiation and Mechanical Extremes , an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, Office of Basic Energy Sciences under Award Number 2008LANL1026. R.J.M. and J.S.C. acknowledge support by a Laboratory Directed Research and Development (LDRD) program 20140348ER.
- Crystal plasticity
- Severe plastic deformation