Department of Mechanical Engineering, National Institute of Technology - Warangal, Telangana 506004, India.
Department of Mechanical Engineering, National Institute of Technology - Warangal, Telangana 506004, India.
Ultrason Sonochem. 2019 Nov;58:104665. doi: 10.1016/j.ultsonch.2019.104665. Epub 2019 Jul 2.
The effect of ultrasonic vibration treatment on nanoparticle distribution was successfully investigated and developed a novel fabrication process to produce nano silicon carbide particle reinforced AA7150-1% SiC nanocomposite through a combination of the vortex, double stir casting, and ultrasonic vibration techniques. Ultrasonicfrequency of 20 KHz and with a power capacity of 1000 W was used in the process. Ultrasonic probe was used for proper mixing of the nanoparticles in the molten bath. Microstructure investigation of grain formation, particle distribution, and fracture surface was analyzed through an optical and scanning electron microscope at the as-cast condition. Energy dispersive spectroscopy was used for determining chemical composition of the nanocomposite. In the novel fabrication process, the influence of sonication effect on material properties such as porosity, microhardness, tensile strength were examined and compared with double stir casted nanocomposite material as well as the base material. Mechanical properties of AA7150-1% SiC novel fabrication process were enhanced with a reported increase of 26.05% in tensile strength, and 10.85% in microhardness. 74.1% reduction in porosity as compared to the base alloy. In the double stir casting process, there was 19.6% increase in tensile strength, 2.9% of improvement in microhardness, and 46.96% reduction in porosity as compared to base material properties. The enhancement of material properties with the ultrasonic probe assisted novel fabrication process are attributed to grain refinement of composite and homogeneous distribution of SiC nanoparticles due to the acoustic streaming and cavitation effect.
超声振动处理对纳米颗粒分布的影响进行了成功的研究，并开发了一种新的制造工艺，通过涡旋、双搅拌铸造和超声振动技术的组合来生产纳米碳化硅颗粒增强 AA7150-1%SiC 纳米复合材料。在该工艺中使用了 20 kHz 的超声频率和 1000 W 的功率。超声探头用于在熔融浴中适当混合纳米颗粒。通过光学显微镜和扫描电子显微镜对铸态下的晶粒形成、颗粒分布和断裂表面进行微观结构研究。能量色散光谱用于测定纳米复合材料的化学成分。在新的制造工艺中，研究了超声效应对材料性能的影响，如孔隙率、显微硬度、拉伸强度，并与双搅拌铸造纳米复合材料以及基础材料进行了比较。与基础合金相比，AA7150-1%SiC 新工艺的拉伸强度提高了 26.05%，显微硬度提高了 10.85%，孔隙率降低了 74.1%。在双搅拌铸造工艺中，拉伸强度提高了 19.6%，显微硬度提高了 2.9%，孔隙率降低了 46.96%，与基础材料性能相比。由于空化和空蚀效应，超声探头辅助新工艺使复合材料晶粒细化，SiC 纳米颗粒均匀分布，从而提高了材料性能。
