石墨烯纳米片 (GNPs) 增强铝合金复合材料凝固过程中的若干挑战

IF 2.6 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Omid Ghaderi, Mehran Zare, Behzad Niroumand, Benjamin C. Church, Pradeep K. Rohatgi
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引用次数: 0

摘要

铝石墨烯复合材料的凝固加工是合成金属基复合材料的一种有吸引力的选择。石墨烯增强铝金属基复合材料(GAMMC)具有低密度、超高物理和机械性能,可改善铝石墨烯复合材料的性能,因此备受关注。然而,铝石墨烯复合材料的凝固加工也面临着一些挑战,包括石墨烯含量超过 0.5 到 3 wt% 时,会导致增强材料的团聚和多孔,从而降低性能。此外,石墨烯表面还可能与熔融铝合金发生反应,形成碳化铝。颗粒分布和孔隙率方面的问题通常是由于熔体对增强材料的润湿性较差造成的,因此需要添加特定的润湿剂。其他问题包括由于密度差异和对流导致强化剂在熔体中移动,从而造成强化剂分布不均匀。在凝固过程中的某些条件下,石墨烯增强体可能会被凝固界面推挤,导致增强体在树枝间区域发生偏析。本文对上述与铝-石墨烯复合材料凝固处理相关的问题进行了批判性分析,这在以前的铝-石墨烯复合材料出版物中是没有的。本文旨在研究面临的挑战,并提出可能的解决方案,包括在铝熔体中添加硅和镁等元素,在石墨烯上涂覆镍和铜等金属,控制固液界面的推进速度和性质,使其能以树枝状或颗粒状吞噬石墨烯。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Selected challenges in solidification processing of graphene nanoplatelets (GNPs) reinforced aluminum alloys composites
Solidification processing of aluminum graphene composite is an attractive option for synthesis of metal matrix composites. Graphene reinforced aluminum metal matrix composites (GAMMCs) are of interest due to the low density and ultrahigh physical and mechanical properties of Graphene which can improve the properties of Al-Graphene composites. However, solidification processing of aluminum graphene composites has served challenges, including agglomeration of reinforcement and porosity resulting in decrease in properties above 0.five to three wt% graphene. Also, the graphene surface can react with molten aluminum alloys to form aluminum carbide. Challenges with particle distribution and porosity are frequently caused by the poor wetting of reinforcement by melt, requiring additions of selected wetting agents. The other problems include movement of reinforcement within the melt due to density differences and convection leading to nonuniform distribution of reinforcements. The graphene reinforcements can be pushed by solidifying interfaces under certain conditions during solidification leading to segregation of reinforcements in the interdendritic regions. The paper critically analyzes the above problems related to solidification processing of Aluminum- Graphene composites which has not been done in previous publications aluminum-graphene composites. The objective of this paper is to examine the challenges, and suggest possible solutions including addition of elements like silicon and magnesium to aluminum melt, coating graphene with metals like nickel and copper, controlling rate of advancement and nature of advancing solid liquid interface in a manner that they engulf graphene with dendrites or grains.
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来源期刊
Frontiers in Materials
Frontiers in Materials Materials Science-Materials Science (miscellaneous)
CiteScore
4.80
自引率
6.20%
发文量
749
审稿时长
12 weeks
期刊介绍: Frontiers in Materials is a high visibility journal publishing rigorously peer-reviewed research across the entire breadth of materials science and engineering. This interdisciplinary open-access journal is at the forefront of disseminating and communicating scientific knowledge and impactful discoveries to researchers across academia and industry, and the public worldwide. Founded upon a research community driven approach, this Journal provides a balanced and comprehensive offering of Specialty Sections, each of which has a dedicated Editorial Board of leading experts in the respective field.
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