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首页> 外文期刊>Journal of Materials Engineering and Performance >Fabrication of AZ31/MWCNTs Surface Metal Matrix Composites by Friction Stir Processing: Investigation of Microstructure and Mechanical Properties
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Fabrication of AZ31/MWCNTs Surface Metal Matrix Composites by Friction Stir Processing: Investigation of Microstructure and Mechanical Properties

机译：摩擦搅拌加工AZ31 / MWCNTS表面金属基复合材料的制造：微观结构和机械性能研究

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摘要

The surface metal matrix composites of AZ31 Mg alloy reinforced with multiwall carbon nanotubes (MWCNTs) have been fabricated through the friction stir processing by a conventional and two stepped tools. The microstructure and mechanical properties of fabricated composites were studied by optical and electron microscopy, microhardness and tensile tests, respectively. The processing has developed a fine-grain structure along with good distribution of reinforcements. The hardness and tensile strength of fabricated MWCNT/AZ31 composites are generally higher than as-received and FSPed samples. The accumulative effect of grain refinement and reinforcing nanotubes is assumed to be the reason for increasing the ductility after friction stir processing. The hardness is nearly doubled for FSPed samples and some more for nanocomposites compared with the as-received sample. The elongation of nanocomposites is about two times greater than that of the as-rolled sample. The speed ratio, pass number and CNT amount are three important factors influencing the resulting microstructure and mechanical properties. The stepped tools also give a more uniform distribution of reinforcement and higher grain refinement.
机译：通过常规和两个阶梯式工具通过摩擦搅拌加工制造AZ31mg合金的AZ31mg合金的表面金属基复合材料。通过光学和电子显微镜，微硬度和拉伸试验研究了制造复合材料的微观结构和力学性能。该加工开发了一种细粒结构，以及良好的增强剂分布。制造的MWCNT / AZ31复合材料的硬度和拉伸强度通常高于接收和FSPED样品。假设晶粒细化和增强纳米管的累积效果是摩擦搅拌加工后增加延展性的原因。与接受的样品相比，FSPED样品几乎加倍，对于纳米复合材料，几乎加倍。纳米复合材料的伸长率约为卷起样品的两倍。速比，通量数和CNT量是影响所得微观结构和机械性能的三个重要因素。阶梯工具还提供了更均匀的增强和更高晶粒细化的分布。

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