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首页> 外文期刊>Materials Science and Engineering >Friction stir processing of squeeze cast A356 with surface compacted graphene nanoplatelets (GNPs) for the synthesis of metal matrix composites
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Friction stir processing of squeeze cast A356 with surface compacted graphene nanoplatelets (GNPs) for the synthesis of metal matrix composites

机译：表面压实石墨烯纳米片（GNP）的挤压铸造A356的摩擦搅拌工艺，用于合成金属基复合材料

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摘要

Friction stir processing (FSP) was applied to graphene nanoplatelets (GNPs) physically compacted on the surface of squeeze cast A356 alloy to incorporate GNPs within the matrix and to improve its mechanical properties. Squeeze casting resulted in finer size silicon and intermetallic compounds in cast microstructure, and subsequently FSP further refined the microstructure of squeeze cast A356 alloy, and GNP reinforced A356 alloy. The finer Si particles, intermetallics and graphene dispersed in the matrix increased the yield and ultimate tensile strength of FSP squeeze cast A356 alloy compared to the results reported in prior literature for FSP A356 alloy. Eutectic Si needles have been converted to fine spherical particles during FSP and were uniformly distributed within the nugget zone. The crystallite size of GNPs which were physically adhered to the surface of squeeze cast alloy prior to FSP decreased after FSP as a result of deformation. Thus, a combination of squeeze casting, and friction stir processing and incorporation of GNPs reinforcement in the A356 matrix is a promising route to further improve its mechanical properties.
机译：将摩擦搅拌工艺（FSP）用于物理压实在挤压铸造A356合金表面的石墨烯纳米片（GNP），以将GNP掺入基体中并改善其机械性能。挤压铸造在铸造组织中产生更细的硅和金属间化合物，随后FSP进一步细化了挤压铸造A356合金和GNP增强A356合金的组织。与先前的FSP A356合金文献报道的结果相比，分散在基体中的更细的Si颗粒，金属间化合物和石墨烯提高了FSP挤压铸造A356合金的屈服强度和极限拉伸强度。共晶硅针在FSP期间已转变为细小的球形颗粒，并均匀分布在金块区域内。由于变形，在FSP之后物理粘附到挤压铸造合金表面上的GNP的微晶尺寸减小。因此，将挤压铸造，摩擦搅拌工艺以及将GNP增强剂掺入A356基体中的组合是进一步改善其机械性能的有前途的途径。

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