Microstructure design and mechanical properties of grain-gradient graphene/aluminum composites

被引:7
作者
Liu, Li-Ya [1 ,2 ]
Yang, Qing-Sheng [1 ]
Liu, Xia [1 ]
机构
[1] Beijing Univ Technol, Dept Engn Mech, Beijing 100124, Peoples R China
[2] Tsinghua Univ, Dept Engn Mech, Appl Mech Lab, Beijing 100084, Peoples R China
基金
中国国家自然科学基金;
关键词
Grain -gradient graphene; Al composites; Microstructure design; Crystal plasticity; Cohesive zone model; Mechanical properties; Damage mechanism; CARBON NANOTUBES; GRAPHENE NANOPLATELETS; CRACK-GROWTH; ALUMINUM; DEFORMATION; NANOCOMPOSITES; BEHAVIORS; EVOLUTION; SIZE;
D O I
10.1016/j.engfracmech.2022.108944
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
The metal matrix with mixed grain-gradient structure and the graphene with different charac-teristics could be designed and prepared to ameliorate the plasticity and toughness reduction of the metal matrix composites (MMCs) caused by graphene reinforcement. However, the rela-tionship between the microstructure and the mechanical properties of composites needs to be investigated. In this paper, a self-developed structural modeling program is employed to design and establish a single-edge notch tensile finite element model of the graphene reinforced grain -gradient aluminum (Al) matrix composites, where the distribution and morphology of gra-phene and grains can be redistributed. Then, the grain size dependence of yield strength is introduced into the developed crystal plasticity finite element method (CPFEM) according to the classical Hall-Petch relationship, the damage mechanism of the graphene/Al composites with various designed novel microstructures is analyzed in combination with the cohesive zone model (CZM), and the microstructure of the graphene/Al composites with optimal mechanical properties is obtained. In addition, it is found that the failure mode, strength and toughness of the com-posites could be ameliorated by adjusting the bonding state of graphene-Al interface. This study provides a new insight into the microstructure design and fabrication of the graphene/Al com-posites with optimal comprehensive properties.
引用
收藏
页数:16
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