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Title: FULL-FIELD MODEL AND EXPERIMENTAL VALIDATION OF SUBGRAIN TEXTURE AND MICROSTRUCTURE EVOLUTION OF POLYCRYSTALLINE COPPER

Authors:
 [1];  [1];  [1]
  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1211589
Report Number(s):
LA-UR-07-1067
DOE Contract Number:
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Conference: NUMIFORM 2007 ; 200706 ; PORTO
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

LEBENSOHN, RICARDO A., BRENNER, RENALD, and CASTELNAU, OLIVIER. FULL-FIELD MODEL AND EXPERIMENTAL VALIDATION OF SUBGRAIN TEXTURE AND MICROSTRUCTURE EVOLUTION OF POLYCRYSTALLINE COPPER. United States: N. p., 2007. Web.
LEBENSOHN, RICARDO A., BRENNER, RENALD, & CASTELNAU, OLIVIER. FULL-FIELD MODEL AND EXPERIMENTAL VALIDATION OF SUBGRAIN TEXTURE AND MICROSTRUCTURE EVOLUTION OF POLYCRYSTALLINE COPPER. United States.
LEBENSOHN, RICARDO A., BRENNER, RENALD, and CASTELNAU, OLIVIER. Fri . "FULL-FIELD MODEL AND EXPERIMENTAL VALIDATION OF SUBGRAIN TEXTURE AND MICROSTRUCTURE EVOLUTION OF POLYCRYSTALLINE COPPER". United States. doi:. https://www.osti.gov/servlets/purl/1211589.
@article{osti_1211589,
title = {FULL-FIELD MODEL AND EXPERIMENTAL VALIDATION OF SUBGRAIN TEXTURE AND MICROSTRUCTURE EVOLUTION OF POLYCRYSTALLINE COPPER},
author = {LEBENSOHN, RICARDO A. and BRENNER, RENALD and CASTELNAU, OLIVIER},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Feb 16 00:00:00 EST 2007},
month = {Fri Feb 16 00:00:00 EST 2007}
}

Conference:
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  • An efficient full-field formulation based on Fast Fourier Transforms (FFT) for the prediction of the viscoplastic deformation of polycrystals is applied to the study of the subgrain texture and microstructure evolution in a copper aggregate deformed under tension. Direct input from OIM images is used in the construction of the initial unit cell. Average orientations and misorientations predicted with the FFT-based approach after 11% tensile strain are directly compared with OIM measurements, showing a reasonable agreement. The differences between misorientations of surface grains compared with bulk grains are estimated, and the orientation-dependence of grain's misorientations is studied. Measurements and simulationsmore » agree in that grains with initial orientation near (110) tend to develop higher misorientations, as deformation proceeds. This behavior can be explained in terms of attraction towards the two different stable orientations and grain interaction. Only models that account for grain interaction, like the FFT-based formulation, are able to capture these effects.« less
  • In attempting to interpret the mechanical response of polycrystalline copper, for which the results in the literature show marked scatter, the effects of microstructure on the cyclic behavior and the substructure evolution of copper polycrystals have been investigated. The microstructure is described by a complex factor--grain size and texture combined. It is found that there is a very significant effect of microstructure in the cyclic response of copper at low and intermediate strain amplitudes, where dislocation structures which localize deformation are expected to be present. In general, the cyclic response of coarse-grained copper shows a much more pronounced cyclic hardeningmore » and higher saturation stresses than those for fine-grained copper. This behavior is associated with a well defined hard <111>-<100> fiber texture, inherited in the coarse-grained material after annealing at relatively high temperatures. The multiple slip associated with the <111>-<001> oriented grains homogenizes the deformation very early, resulting in strong cyclic hardening, and a faster substructure evolution into cell structure.« less
  • Oxygen free electronic copper, 99.995% purity, of two initial grain sizes, 50 {mu}m and 100 {mu}m, has been cold rolled to six strains of 1.0, 1.5, 2.0, 2.65, 3.5 and 4.5 (von Mises equivalents). The rolled materials were partially and fully recrystallized to study the development of recrystallization textures as a function of grain size, strain and fraction recrystallized. The initial textures were relatively random and the deformation textures show the classic {beta} fiber development. As strain is increased both materials produce increasingly intense cube recrystallization textures, (100)<001>, as measured both by x-ray diffraction and the electron backscatter pattern (EBSP)more » techniques. The strong cube recrystallization textures are a product of a higher than random frequency of cube nucleation sites. An additional factor is that cube regions grow larger than non-cube regions. The explanation of the cube frequency advantage is based on the development of large stored energy differences between cube orientations and neighboring orientations due to recovery of cube sites. Of several possible explanations of the cube orientation size advantage, the most plausible one is solute entrapment. At the higher strains the boundaries of cube grains encounter the deformation texture S components, (123)<634>, changing the boundary character to one of 40{degrees}<111>. These boundaries are more resistant to solute accumulation than random high angle boundaries, allowing the boundaries to migrate with less of a solute drag effect than a random high angle boundary.« less