Abstract
Split-Hopkinson pressure bar dynamic compression experiments were conducted to determine the defect/interface interaction dependence on interface type, bilayer thickness and interface orientation with respect to the loading direction in the Ag-Cu eutectic system. Specifically, the deformation microstructure in alloys with either a cube-on-cube orientation relationship with {111}Ag||{111}Cu interface habit planes or a twin orientation relationship with {3̅13}Ag||{1̅12}Cu interface habit planes and with bilayer thicknesses of 500 nm, 1.1 µm and 2.2 µm were probed using TEM. The deformation was carried by dislocation slip and in certain conditions, deformation twinning. The twinning response was dependent on loading orientation with respect to the interface plane, bilayer thickness, and interface type. Twinning was only observed when loading at orientations away from the growth direction and decreased in prevalence with decreasing bilayer thickness. Twinning in Cu was dependent on twinning partial dislocations being transmitted from Ag, which only occurred for cube-on-cube interfaces. Dislocation slip and deformation twin transfer across the interfaces is discussed in terms of the slip transfer conditions developed for grain boundaries in FCC alloys.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 313-324 |
| Number of pages | 12 |
| Journal | Materials Science and Engineering A |
| Volume | 712 |
| DOIs | |
| State | Published - Jan 17 2018 |
Bibliographical note
Funding Information:This work was performed, in part, at the University of Illinois by a grant from the National Nuclear Security Administration of the Department of Energy (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. Electron Microscopy was carried out in part at the University of Wisconsin-Madison Materials Research Science and Engineering Center (DMR-1121288) and in part in the Frederick Seitz Materials Research Laboratory Central Facilities, University of Illinois. The authors would like to acknowledge Dr. Rodney McCabe, Professor Irene Beyerlein, Dr. Ao Li, and Professor Izabela Szlufarska for helpful discussions.
Funding Information:
This work was performed, in part, at the University of Illinois by a grant from the National Nuclear Security Administration of the Department of Energy ( 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 . Electron Microscopy was carried out in part at the University of Wisconsin-Madison Materials Research Science and Engineering Center ( DMR-1121288 ) and in part in the Frederick Seitz Materials Research Laboratory Central Facilities, University of Illinois . The authors would like to acknowledge Dr. Rodney McCabe, Professor Irene Beyerlein, Dr. Ao Li, and Professor Izabela Szlufarska for helpful discussions.
Publisher Copyright:
© 2017 Elsevier B.V.
Keywords
- Deformation twinning
- Electron microscopy
- Eutectic alloy
- Grains and interfaces
- High strain-rate loading
- Plasticity