The deformation response of a directionally solidified Ag60Cu40 eutectic alloy with a cube-on-cube orientation relationship between Ag and Cu subjected to high strain-rate 103s-1 compressive loading was examined. Loading at 45° and 90° to the growth axis, near  and [111-] local crystal orientations, respectively, resulted in deformation twinning and dislocation slip in both Ag and Cu under conditions where deformation twinning would not normally be expected in Cu. In contrast, loading at 0° and 90° to the growth axis, near 〈101〉 local crystal orientations, resulted in the primary deformation mode being dislocation slip. These results are interpreted in terms of the influence of loading axis with respect to the local crystal orientation in the directionally solidified alloy and on slip transmission from Ag into Cu.
Bibliographical noteFunding Information:
This work was performed, in part, at the University of Illinois Urbana-Champaign by a grant from the National Nuclear Security Administration of the Department of Energy under contract DE-FG52-09NA29463 . This work was also performed, in part, at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science. Los Alamos National Laboratory, an affirmative action equal opportunity employer, is operated by Los Alamos National Security, LLC, for the National Nuclear Security Administration of the U.S. Department of Energy under contract DE-AC52-06NA25396. Compression testing assistance was provided by the Advanced Materials Testing and Evolution Laboratory (AMTEL) through Dr. Gavin Horn, Fire Service Institute, University of Illinois at Urbana-Champaign. Electron Microscopy was carried out in the Frederick Seitz Materials Research Laboratory Central Facilities at the University of Illinois in addition to the Electron Microscopy Laboratory at Los Alamos National Laboratory.