Zhang, Jun Shim, Sang Hun Cho, Hyeyoung Lee, Donggil Lee, Soo Yeol Ahn, Jae-Pyoung Han, Jun Hyun 2024-01-19T08:33:15Z 2024-01-19T08:33:15Z 2023-10-29 2023-09 2238-7854 https://pubs.kist.re.kr/handle/201004/113263 Bimodal reinforcement consisting of powders of large graphite flake (GF) and small graphene nanoplatelet (GNP) were used to fabricate (GF thorn GNP)/Cu composites to reduce the anisotropy of the thermal and mechanical properties in GF/Cu composites. In this study, we investigated the effects of GNP addition on the anisotropy of the thermal and mechanical properties and the deformation behavior of (GF thorn GNP)/Cu composites. The (2) theta > value was used to evaluate the alignment of the reinforcing phases (GF, GNP), by which the variations in the coefficient of thermal expansion (CTE) and thermal conductivity (TC) of the composites were analyzed. With increasing GNP volume fraction, the angle (theta) at which the GF deviated from the in-plane direction increased. As a result, the anisotropy of the CTE in the in-plane and through-plane directions increased, whereas the anisotropy of the TC and mechanical strength decreased. Cracking was observed in both the specimens compressed along the in-plane and through-plane directions, whereas kinking was observed only in the specimens compressed along the in-plane direction. The deformation behavior and mechanical properties of the composites with bimodal reinforcement in the in-plane and through-plane directions were strongly dependent on the change in the alignment of the GF with the addition of GNP. The results clearly revealed the role of bimodal reinforcement in controlling the anisotropy of the thermal and mechanical properties of the (GF thorn GNP)/Cu composite, providing guidelines for optimizing the thermomechanical properties of high-performance (GF thorn GNP)/Cu composites. (c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). English Elsevier Editora Ltda Bimodal reinforcement of graphite flake and graphene nanoplatelet in Cu matrix composites: Anisotropy of the thermo-mechanical properties and failure mechanisms Article 10.1016/j.jmrt.2023.08.060 1 Journal of Materials Research and Technology, v.26, pp.2539 - 2559 Journal of Materials Research and Technology 26 2539 2559 Y scie scopus 001069794500001 2-s2.0-85168306972 Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Materials Science Metallurgy & Metallurgical Engineering Article ENHANCED THERMAL-CONDUCTIVITY CARBON NANOTUBES NANO-LAYER MICROSTRUCTURE MANAGEMENT EXPANSION ALIGNMENT GF/Cu composite Graphene nanoplatelet (GNP) Bimodal reinforcement Coefficient of thermal expansion (CTE) Mechanical property