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Title: Deformation response of cube-on-cube and non-coherent twin interfaces in AgCu eutectic after dynamic plastic compression

Abstract

For this research, 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 {$$\overline{3}13$$} Ag||{$$\overline{1}12$$} 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. Lastly, 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.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [2];  [4];  [5];  [4]
  1. Univ. of Illinois, Urbana, IL (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Univ. of Illinois, Urbana, IL (United States); University of Utah, Salt Lake City, UT (United States)
  4. University of Wisconsin-Madison, Madison, WI (United States)
  5. University of Utah, Salt Lake City, UT (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)
OSTI Identifier:
1415383
Report Number(s):
LA-UR-17-24245
Journal ID: ISSN 0921-5093; TRN: US1800785
Grant/Contract Number:
AC52-06NA25396; FG52-09NA29463
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
Additional Journal Information:
Journal Volume: 712; Journal ID: ISSN 0921-5093
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Electron microscopy; Grains and interfaces; Plasticity; Deformation twinning; High strain-rate loading; Eutectic alloy

Citation Formats

Eftink, Benjamin P., Mara, Nathan Allan, Kingstedt, Owen T., Safarik, Douglas Joseph, Wang, Shuai, Lambros, J., and Robertson, Ian M.. Deformation response of cube-on-cube and non-coherent twin interfaces in AgCu eutectic after dynamic plastic compression. United States: N. p., 2017. Web. doi:10.1016/j.msea.2017.11.108.
Eftink, Benjamin P., Mara, Nathan Allan, Kingstedt, Owen T., Safarik, Douglas Joseph, Wang, Shuai, Lambros, J., & Robertson, Ian M.. Deformation response of cube-on-cube and non-coherent twin interfaces in AgCu eutectic after dynamic plastic compression. United States. doi:10.1016/j.msea.2017.11.108.
Eftink, Benjamin P., Mara, Nathan Allan, Kingstedt, Owen T., Safarik, Douglas Joseph, Wang, Shuai, Lambros, J., and Robertson, Ian M.. Sat . "Deformation response of cube-on-cube and non-coherent twin interfaces in AgCu eutectic after dynamic plastic compression". United States. doi:10.1016/j.msea.2017.11.108.
@article{osti_1415383,
title = {Deformation response of cube-on-cube and non-coherent twin interfaces in AgCu eutectic after dynamic plastic compression},
author = {Eftink, Benjamin P. and Mara, Nathan Allan and Kingstedt, Owen T. and Safarik, Douglas Joseph and Wang, Shuai and Lambros, J. and Robertson, Ian M.},
abstractNote = {For this research, 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 {$\overline{3}13$}Ag||{$\overline{1}12$}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. Lastly, 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.},
doi = {10.1016/j.msea.2017.11.108},
journal = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},
number = ,
volume = 712,
place = {United States},
year = {Sat Dec 02 00:00:00 EST 2017},
month = {Sat Dec 02 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
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  • The mechanisms of strain transfer across Ag/Cu interfaces were determined by a combination of in situ and ex situ TEM straining experiments and molecular dynamics simulations. Minimizing the magnitude of the Burgers vector of the residual dislocation generated in the interface was the dominant factor for determining the outcome of dislocation and deformation twin interactions with both non-coherent twin and cube-on-cube interfaces. This included the unexpected finding, due to the loading condition, of deformation twin activation in the Cu layer due to the intersection of deformation twins in Ag with the interface. As a result, deformation twin nucleation in Agmore » from the non-coherent twin interfaces was also explained by a Burgers vector minimization argument.« less
  • The effects of hydrostatic compression on the mechanical properties of aluminum at various degrees of preliminary extrusion were studied with four-step extrusion specimens which permitted deformation from x - 0).704 to x = 0.95 at 4000 to 7000 kg/cm/sup 2/. (R.V.J.)
  • In the framework of linear elasticity the authors found a solution to the problem of a ledge on a coherent boundary of a second phase particle with an arbitrary misfit. The solution is obtained by the superposition of elementary precipitates: a cube-shaped precipitate and a plate-shaped one. It is applied to the study of the elastic fields associated with a ledge on the face of a cube-shaped {gamma}{prime} precipitate in a nickel-base alloy and to follow the evolution of the fields as the ledge grows. The solution makes it evident that the perturbations to the elastic fields given rise bymore » the presence of a ledge are just the fields generated by the plate-shaped precipitate. Although the transformation strains of {gamma}{prime} are pure dilation, the perturbation to the elastic fields is anisotropic and its source is traced back to the intrinsic material anisotropy and to geometric anisotropy, associated with the shape of the plate. Hence the contribution of the ledge to the elastic fields evolves with the lateral growth of the ledge, unlike the case of ledges on free surfaces. The trace of the stress tensor in the matrix in front of the ledge determines the interaction of the ledge with solute atoms. In the case of dilatational transformation the non-vanishing of the trace of the stress tensor is due solely to the material anisotropy. Its range and magnitude are, however, determined by the shape of the precipitate. In the matrix adjacent to a simple cube-shaped precipitate the trace is compressive, implying repulsive interaction with large solute atoms; its absolute value decreases near the edges of the cube. A ledge makes a tensile contribution to the trace ahead of its rise, forming a deep trap for large solute atoms and elastically preferred routes for their diffusion toward the ledge. The tensile trace contribution is maximal when c/a {approximately} 0.04 and at that state the rate of ledge growth is expected to be maximal.« less
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