Microstructural characteristics and mechanical behavior of SiC(CNT)/Al multiphase interfacial micro-zones via molecular dynamics simulations
| Autor: | Boyang Chen, Caihao Qiu, Qiubao Ouyang, Jingyu Yang, Yishi Su, Xiaoshu Wang, Di Zhang |
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| Rok vydání: | 2021 |
| Předmět: |
Toughness
Materials science Tensile fracture Mechanical Engineering Modulus 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences Shear (sheet metal) Metal Molecular dynamics Mechanics of Materials visual_art Ceramics and Composites visual_art.visual_art_medium Dislocation Composite material 0210 nano-technology Research method |
| Zdroj: | Composites Part B: Engineering. 220:108996 |
| ISSN: | 1359-8368 |
| DOI: | 10.1016/j.compositesb.2021.108996 |
| Popis: | Developing metal matrix composites (MMCs) with hybrid reinforcements becomes a promising approach to balance and improve their strengths and toughness. However, due to complexity of multiphase interfacial micro-zones and lack of suitable research method, difficulties are still existing in revealing the structure-property relationship of hybrid MMCs. In this work, molecular dynamics simulations are conducted to study microstructural characteristics and mechanical behavior of SiC(CNT)/Al multiphase interfacial micro-zones under uniaxial tensions. Six atomic-scale structural models of SiC/Ni/CNT, SiC/Al, SiC/Ni/CNT(l)/Al, SiC/CNT(l)/Al SiC/Ni/CNT(s)/Al and SiC/CNT(s)/Al (l: long, s: short) interfacial micro-zones are created, respectively. Compared with those of SiC/Al interfacial micro-zone, improved tensile ductility and toughness are achieved in the SiC/Ni/CNT(l)/Al, SiC/CNT(l)/Al, SiC/Ni/CNT(s)/Al and SiC/CNT(s)/Al interfacial micro-zones, where lots of dislocations, larger dislocation densities and continuously increasing equivalent shear strains appear. SiC/Ni/CNT(l)/Al and SiC/CNT(l)/Al interfacial micro-zones with long CNT clusters could produce large Young's modulus, while those of SiC/Ni/CNT(s)/Al and SiC/CNT(s)/Al interfacial micro-zones are relatively low caused by poorly load-transferring. Tensile fracture of SiC/Al interfacial micro-zone occurs at the SiC/Al interface due to the local concentrations of both dislocations and plastic deformation, while those of SiC/Ni/CNT(l)/Al, SiC/CNT(l)/Al SiC/Ni/CNT(s)/Al and SiC/CNT(s)/Al interfacial micro-zones all happen in the Al matrix close to the bottom ends of CNTs and SiC. From the analysis above, the microstructural characteristics and mechanical behavior of SiC(CNT)/Al multiphase interfacial micro-zones can be brought into light, which would be applied to design and fabricate smart multiphase MMCs. |
| Databáze: | OpenAIRE |
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