TY - JOUR
T1 - Role of strain compatibility in the cyclic deformation of copper bicrystals
AU - Peralta, P.
AU - Laird, C.
N1 - Funding Information:
This work was supported by The Department of Energy under Grant No. DE-FG02-84ER-45188 and by the Laboratory for Research on the Structure of Matter which provided assistance with the central facilities. This support is greatly appreciated. We warmly thank Professor Z.-G. Wang for generously providing the parent copper single crystal used to produce all the seeds required for this work, and Professor H. Mughrabi for providing original data.
PY - 1997
Y1 - 1997
N2 - In order to improve our understanding of the link between the cyclic deformation of single crystals and of polycrystalline materials, a study was performed on copper bicrystals. Testing under strain control within the high cycle regime was performed in isoaxial [1̄49] (90° and 180°) twist boundaries and [1̄49]/[001] bicrystals, all with boundaries perpendicular to the tensile axis. A Grain Boundary Affected Zone (GBAZ), where multiple slip dominated, appeared when the boundaries developed compatibility stresses. Experiments showed that the behavior of macroscopically compatible bicrystals, 180° boundaries, is approximately similar to that of a monocrystal, whereas the fatigue responses of the other misorientations show a grain boundary effect, which increases the cyclic stress. The strain in each grain of the [1̄49]/[001] sample was measured separately. The plastic deformation in the adjacent crystals oscillated during initial hardening; finally, the soft grain carried approximately five times the plastic strain of the other grain.
AB - In order to improve our understanding of the link between the cyclic deformation of single crystals and of polycrystalline materials, a study was performed on copper bicrystals. Testing under strain control within the high cycle regime was performed in isoaxial [1̄49] (90° and 180°) twist boundaries and [1̄49]/[001] bicrystals, all with boundaries perpendicular to the tensile axis. A Grain Boundary Affected Zone (GBAZ), where multiple slip dominated, appeared when the boundaries developed compatibility stresses. Experiments showed that the behavior of macroscopically compatible bicrystals, 180° boundaries, is approximately similar to that of a monocrystal, whereas the fatigue responses of the other misorientations show a grain boundary effect, which increases the cyclic stress. The strain in each grain of the [1̄49]/[001] sample was measured separately. The plastic deformation in the adjacent crystals oscillated during initial hardening; finally, the soft grain carried approximately five times the plastic strain of the other grain.
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U2 - 10.1016/S1359-6454(96)00384-9
DO - 10.1016/S1359-6454(96)00384-9
M3 - Article
AN - SCOPUS:0031192382
SN - 1359-6454
VL - 45
SP - 3029
EP - 3046
JO - Acta Materialia
JF - Acta Materialia
IS - 7
ER -