Abstract

This study emphasis on a novel fabrication technique to fabricate hybrid cermets using Al 6061 alloy with nano sized SiC, Al₂O₃ and TiO₂ as reinforcements. During the fabrication process, the melted pool was ultrasonicated to disperse nanoparticles at 20 kHz for 5 min and pressure of 50 MPa was applied to eliminate voids. The influence of nanoparticles on physical, thermal and mechanical properties were evaluated by tensile, wear and thermal studies. Cermets with Al₂O₃ reinforcements showed higher mechanical performance compared to Al alloy. This enhancement could be related to the uniform distribution of Al₂O₃ with refinement in grain size of Al alloy which was observed via surface analysis. The morphological studies provided justifiable evidence of homogeneous distribution, nominal cluster along with agglomeration and cavities shrinking on the cermets. The agglomeration of nanoparticles along with SiC protected the cermet in corrosion and abrasive wear by ~ 97% and ~ 71%. The study evidenced the novel fabrication method using ultrasonic rheo-squeeze casting led to improvement in mechanical and thermal properties of the hybrid cermets.

Graphical abstract

中文翻译：

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纳米粒子增强对新型超声辅助流变挤压铸造法制备的 6061 铝合金的影响

摘要

本研究重点介绍了一种使用具有纳米尺寸 SiC、Al ₂ O ₃和 TiO ₂作为增强材料的 Al 6061 合金制造混合金属陶瓷的新制造技术。在制造过程中，熔池被超声处理以在 20 kHz 下分散纳米粒子 5 分钟，并施加 50 MPa 的压力以消除空隙。通过拉伸、磨损和热研究评估纳米颗粒对物理、热和机械性能的影响。与铝合金相比，具有 Al ₂ O ₃增强材料的金属陶瓷表现出更高的机械性能。这种增强可能与 Al ₂ O ₃的均匀分布有关通过表面分析观察到铝合金晶粒尺寸的细化。形态学研究为金属陶瓷上的均匀分布、名义簇以及团聚和空腔缩小提供了合理的证据。纳米颗粒与 SiC 的团聚保护了金属陶瓷在腐蚀和磨损方面的~97% 和~71%。该研究证明，使用超声波流变挤压铸造的新型制造方法改善了混合金属陶瓷的机械和热性能。

图形概要