Erappa Rajj Babu, Nagaral Madeva, Chintakindi Sanjay, Kumar Raman, Anqi Ali E, Rajhi Ali A, Duhduh Alaauldeen A, Sridevi Gedala, Prakash Chander, Kumar Raman, Chan Choon Kit
Department of Mechanical Engineering, Bangalore Institute of Technology, Bangalore 560004, India.
Manager, Aircraft Research and Design Centre, Hindustan Aeronautics Limited, Bangalore 560037, Karnataka, India.
ACS Omega. 2024 Apr 12;9(16):17878-17890. doi: 10.1021/acsomega.3c08822. eCollection 2024 Apr 23.
Aluminum metal cast composites (AMCCs) are frequently used in high-tech sectors such as automobiles, aerospace, biomedical, electronics, and others to fabricate precise and especially responsible parts. The mechanical and wear behavior of the metal matrix composites (MMCs) is anticipated to be influenced by the cooling agent's action and the cooling temperature. This research paper presents the findings of a series of tests to investigate the mechanical, wear, and fracture behavior of hybrid MMCs made of Al7075 reinforced by varying wt % of nano-sized AlO and Gr and quenched with water and ice cubes. The heat-treated Al7075 alloy hybrid composites were evaluated for their hardness, tensile, and wear behavior, showcasing a significant process innovation. The heat treatment process greatly improved the hybrid composites' mechanical and wear performance. The samples quenched in ice attained the highest hardness of 119 VHN. There is a 45.37% improvement in the hardness of base alloy with the addition of 3% of AlO and 1% of graphite particles. Further, the highest tensile and compression strengths were found in the ice-quenched 3% AlO and 1% graphite hybrid composites with improvements of 34.2 and 48.83%, respectively, compared to the water-quenched base alloy. Under the samples quenched in ice, the mechanical and wear behavior improved. The tensile fractured surface showed voids, particle pullouts, and dimples. The worn-out surface of wear test samples of the created hybrid composite had micro pits, delamination layers, and microcracks.
铝金属铸造复合材料（AMCCs）常用于汽车、航空航天、生物医学、电子等高科技领域，以制造精密且特别可靠的零件。金属基复合材料（MMCs）的力学和磨损行为预计会受到冷却剂作用和冷却温度的影响。本研究论文展示了一系列试验的结果，这些试验旨在研究由不同重量百分比的纳米级AlO和Gr增强、并用水和冰块淬火的Al7075制成的混合MMCs的力学、磨损和断裂行为。对经过热处理的Al7075合金混合复合材料的硬度、拉伸和磨损行为进行了评估，展示了一项重大的工艺创新。热处理工艺极大地改善了混合复合材料的力学和磨损性能。在冰中淬火的样品获得了最高硬度119维氏硬度。添加3%的AlO和1%的石墨颗粒后，基体合金的硬度提高了45.37%。此外，在冰淬火的3%AlO和1%石墨混合复合材料中发现了最高的拉伸和压缩强度，与水淬火的基体合金相比，分别提高了34.2%和48.83%。在冰中淬火的样品中，力学和磨损行为得到改善。拉伸断裂表面显示出孔洞、颗粒拔出和韧窝。所制备的混合复合材料磨损试验样品的磨损表面有微坑、分层和微裂纹。
