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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2023.2
- 수록면
- 402 - 419 (18page)
- DOI
- 10.1007/s12540-022-01238-0
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In this research, the effects of heat treatment and hybrid reinforcement ratio on the microstructural and mechanical propertiesof Al–4Cu nanocomposites containing MWCNT and nano Al2O3pwere investigated. First of all, the hybrid reinforcedAl–4Cu nanocomposites were manufactured with the aid of mechanical alloying and microwave sintering. And then, theywere subjected to various heat treatments; annealing and artificial aging at 170, 180 and 200 °C individually. After that,the microstructural observations were made using X-ray diffraction, optical microscope and scanning electron microscopes(SEMs). The secondary electrons (SE), back scattered electrons (BSE), energy dispersive X-ray (EDX) and elemental mappinganalyses of the specimens were carried out with the aid of SEMs. In addition, the nanoindentation tests were done toget the nanohardness and elastic modulus of composites. Finally, the composites were subjected to the compression testto clarify their compressive properties. The Al2Cuand Al4C3precipitates were detected in the composite samples eitherannealed or peak-aged at 200 °C, while the intermetallic compound, Al7Cu2Fe,precipitated only in the aged samples. Asignificant increment in the nanohardness of composites was obtained with increasing reinforcement content. Moreover, theelastic modulus of annealed and peak-aged composites, reinforced with 15% hybrid reinforcement in volume, increased by59% and 57%, respectively compared to the unreinforced alloy. Furthermore, the use of hybrid reinforcement in the alloymatrix allowed an improvement of compressive yield strength at the expense of compressive strain.
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