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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure, Strength, and Wear Behavior Relationship in Al-Fe3O4 Nanocomposite Produced by Multi-pass Friction Stir Processing
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Microstructure, Strength, and Wear Behavior Relationship in Al-Fe3O4 Nanocomposite Produced by Multi-pass Friction Stir Processing

机译：通过多通摩擦搅拌加工生产的Al-Fe3O4纳米复合材料中的微观结构，强度和磨损行为关系

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摘要

Aluminum matrix in situ nanocomposite was produced by one to six passes friction stir processing (FSP) with pre-placed Fe3O4 nanoparticles (15-20 nm). Microstructure studies showed that solid-state reactions between the aluminum matrix and Fe3O4 particles during the process led to in situ formation of Al3Fe and Al5Fe2 in the stir zone. Initial Fe3O4 as well as Al-Fe intermetallic compounds (IMCs) particles were homogeneously dispersed in a fine grain matrix after six passes of FSP. Hardness and ultimate tensile strength of the composites were increased 64 and 27%, respectively, compared to the base metal. The reasons were studied in the light of reinforcing particles distribution, formation of Al-Fe IMCs, and grain size of the aluminum matrix. Pin-on-disk wear test indicated that in comparison with the base metal, the weight loss and friction coefficient of the composite processed by six passes decreased about 70 and 37%, respectively. Impact energy of the composite produced by six passes was considerably higher than that of the composite produced by one pass and reached to similar to 65% of the impact energy of the annealed aluminum base metal. Moreover, corrosion potential in the composites changed to more noble potentials compared to the base metal.
机译：用预先放置的Fe3O4纳米颗粒（15-20nm）产生铝基质原位纳米复合材料通过摩擦搅拌加工（FSP）。微观结构研究表明，在该过程中铝基质和Fe3O4颗粒之间的固态反应导致搅拌区中的Al3Fe和Al5Fe2的原位形成。初始Fe3O4以及Al-Fe金属间化合物（IMC）颗粒在六次FSP之后均匀地分散在细粒基质中。与基础金属相比，复合材料的硬度和极限拉伸强度分别增加了64和27％。根据增强颗粒分布，形成Al-Fe IMC的形成，以及铝基质的晶粒尺寸来研究原因。引脚盘磨损试验表明，与基础金属相比，六次通过的复合材料的重量损失和摩擦系数分别降低了约70％和37％。六次通孔产生的复合材料的冲击能量远高于通过一次通过产生的复合材料的能量，并且达到与退火铝基金属的冲击能量的65％相似。此外，与基础金属相比，复合材料中的腐蚀电位变为更高贵的电位。

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