Interface-coupling-dependent mechanical behaviors of sandwich-structured Ni/Cu/Ni composites
作者： Fei Liang , Xue-Mei Luo , Guang-Ping Zhang
DOI: 10.1016/J.MSEA.2018.11.107
关键词: Coupling (piping) 、 Stress gradient 、 Hardening effect 、 Coupling effect 、 Work (thermodynamics) 、 Dislocation 、 Materials science 、 Uniaxial tension 、 Composite material 、 Mechanical engineering 、 General Materials Science 、 Mechanics of Materials 、 Condensed matter physics
摘要: Abstract Maximizing the interface coupling effect is a key to improve mechanical properties of laminate/gradient structures. In this work, Ni/Cu/Ni sandwich-structured composites with middle Cu layers cyclically deformed different cycles were fabricated investigate influence initial dislocation density on interface-coupling-dependent behavior. Extra yield strength contributed by was found decrease decreasing degree incompatibility across during uniaxial tensile loading. addition, width geometrical necessary (GND) pile-up regions adjacent interfaces observed increasing layers, which attributed change source-obstacle configuration in stress gradient model. These findings suggest that GND strengthening caused and cyclic hardening constituent appears be competitive, gradually weakened layers.
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