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Synthesis of A356-MWCNT nanocomposites through a novel two stage casting process

机译：通过新颖的两步铸造法合成A356-MWCNT纳米复合材料

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摘要

In this study, A356-0.5 wt% MWCNT nanocomposites were successfully fabricated using a novel two stage composite casting process. First, Al-MWCNT composite stripes were produced by the accumulative roll bonding (ARB) method. The composite stripes were then diluted in a molten matrix of appropriate composition followed by squeeze casting. The purpose of ARB treatment was to improve wettability of MWCNTs with the matrix and reduce their agglomeration tendency. The results showed that addition of 0.5 wt% MWCNT and application of pressure during solidification of the composite led to microstructural refinement and improvement in mechanical properties of the cast composites. Secondary dendrite arm spacing of the nanocomposites was decreased by 52% and the hardness, shear strength and shear elongation were improved by 38%, 20% and 46.6%, respectively, at the highest squeeze casting pressure employed. Evidence of low agglomeration of MWCNTs in the matrix was detected on the sheared surfaces of the castings. The results are discussed in terms of the effects of the processing parameters on reinforcement wettability, distribution and engulfment in the matrix.
机译：在这项研究中，使用新型的两步复合铸造工艺成功地制造了A356-0.5 wt％MWCNT纳米复合材料。首先，通过累积辊压结合（ARB）方法生产Al-MWCNT复合条。然后将复合条带稀释在适当组成的熔融基质中，然后进行压铸。 ARB处理的目的是提高MWCNT与基质的润湿性，并降低其聚集趋势。结果表明，在复合材料的凝固过程中添加0.5 wt％的MWCNT和施加压力导致了铸件复合材料的微观结构细化和机械性能的改善。在采用最高挤压铸造压力时，纳米复合材料的二次枝晶臂间距减少了52％，硬度，剪切强度和剪切伸长率分别提高了38％，20％和46.6％。在铸件的剪切表面上发现了基体中MWCNT的低聚集现象。根据加工参数对基体中增强润湿性，分布和吞噬的影响讨论了结果。

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