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首页> 外文期刊>Materials & design >Fabrication and characterization of functionally graded Al-SiC nanocomposite by using a novel multistep friction stir processing
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Fabrication and characterization of functionally graded Al-SiC nanocomposite by using a novel multistep friction stir processing

机译：新型多步搅拌摩擦法制备功能梯度Al-SiC纳米复合材料及其表征

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摘要

Functionally graded materials are one of the most promising candidates among advanced materials. However, some challenges still exist in its fabrication methods. The current study aims to produce functionally-graded bulk Al-SiC nanocomposites by a novel multistep friction stir processing (FSP) for the first time. The SiC nanoparticles were packed into a groove on the 6061 aluminum plate and FSP was performed by using a tool with pin length of 6 mm. Subsequently, FSP was reapplied on another groove by using a tool with a shorter pin length of 3.2 mm. The desirable distribution of SiC nanoparticles in the matrix was confirmed by scanning electron and atomic force microscopes. The composition of graded sample was changed continuously from 18 to 0 wt% SiC along the thickness. Accordingly, the microhard-ness profile showed a maximum of 160 Hv in the enriched zone which is 3.2 times higher than the hardness of the particle-depleted zone. However, a constant hardness value of 135 Hv was obtained along the thickness of homogenous sample which is 15% lower than that of superficial layer in graded sample. Moreover, the hardness values were linearly correlated with the inverse of interparticle spacing.
机译：功能分级的材料是高级材料中最有希望的候选材料之一。但是，其制造方法仍然存在一些挑战。当前的研究旨在首次通过新颖的多步摩擦搅拌工艺（FSP）生产功能分级的块状Al-SiC纳米复合材料。将SiC纳米颗粒填充到6061铝板上的凹槽中，并使用针长为6 mm的工具进行FSP。随后，使用短针长为3.2 mm的工具将FSP重新涂在另一个凹槽上。通过扫描电子和原子力显微镜确认了SiC纳米颗粒在基体中的理想分布。梯度样品的组成沿厚度从18 wt％SiC连续变化。因此，显微硬度分布图在富集区显示出最大160 Hv，这比贫颗粒区的硬度高3.2倍。然而，沿着均匀样品的厚度获得的恒定硬度值为135 Hv，比分级样品中的表层厚度低15％。此外，硬度值与颗粒间间距的倒数线性相关。

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