The role of strain compatibility in the cyclic deformation of copper bicrystals

Journal Article · Tue Jul 01 04:00:00 EDT 1997 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(96)00384-9· OSTI ID:524551

Peralta, P; Laird, C ^[1]

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1. Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Materials Science and Engineering

In order to improve the 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 [{bar 1}49]/[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 [{bar 1}49][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.

• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-85ER45188
• OSTI ID: 524551
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 7 Vol. 45; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BICRYSTALS
COPPER
DEFORMATION
FATIGUE
GRAIN BOUNDARIES
GRAIN ORIENTATION
PLASTICITY
SLIP
STRAIN GAGES
STRAIN HARDENING