Shankar Karthik Venkitraman, Jezierski Jan, Ramalingam Vaira Vignesh, Padmakumar Devaprasad, Leena Midun Raj, Reghunath Gokul, Krishnan Rakesh
Department of Mechanical Engineering, Amrita Vishwa Vidyapeetham, Amritapuri, Kollam 690525, India.
Department of Foundry Engineering, Silesian University of Technology, Towarowa 7, 44-100 Gliwice, Poland.
Materials (Basel). 2022 Aug 8;15(15):5462. doi: 10.3390/ma15155462.
The authors researched the physical, metallurgical, and mechanical characteristics of A354 alloy (Al-Si-Mg-Cu) reinforced with 5, 10, and 15 wt% of fly ash metal matrix composites. A baseline alloy and three composites were fabricated by a liquid metallurgy route and poured into a permanent mold to obtain cast rods of dimension Φ32 mm × 156 mm. The metallurgical characterization of the developed alloy and metal matrix composites was conducted using energy-dispersive spectroscopy (EDS), field-emission scanning electron microscopy (FESEM), and X-ray diffraction. All the developed composites showed a pore-free nature, but only A354 alloy reinforced with 5 wt% of fly ash (AF) possessed a homogeneous distribution and perfect bonding of the fly ash with the A354 matrix. Therefore, transmission electron microscopy (TEM) analysis was performed on the sample AF. All developed alloys and metal matrix composites were subjected to hardness and mechanical property tests. It was observed that the AF sample had 170 ± 5.6 HV and tensile strength of 216 ± 2.3 MPa, 18.8% and 24.8% higher than the A354 matrix, but the ductility (6.5 ± 0.43%) was reduced by 23% from the baseline alloy. Finally, the fractography analysis was conducted on all the samples using FESEM to analyze the fracture mode. The fabricated 5 wt% fly ash-based metal matrix composite showed better mechanical performance than other samples. Hence, sample AF is suggested for manufacturing components in automotive and structural parts.
作者研究了添加5%、10%和15%重量比粉煤灰的A354合金（Al-Si-Mg-Cu）金属基复合材料的物理、冶金和力学特性。通过液态冶金路线制备了一种基准合金和三种复合材料，并将其浇铸到永久模具中，以获得尺寸为Φ32 mm×156 mm的铸棒。使用能量色散光谱（EDS）、场发射扫描电子显微镜（FESEM）和X射线衍射对所开发的合金和金属基复合材料进行冶金表征。所有开发的复合材料均呈现无孔特性，但只有添加5%重量比粉煤灰（AF）的A354合金具有均匀的分布以及粉煤灰与A354基体的完美结合。因此，对AF样品进行了透射电子显微镜（TEM）分析。对所有开发的合金和金属基复合材料进行了硬度和力学性能测试。观察到AF样品的硬度为170±5.6 HV，抗拉强度为216±2.3 MPa，分别比A354基体高18.8%和24.8%，但其伸长率（6.5±0.43%）比基准合金降低了23%。最后，使用FESEM对所有样品进行断口分析，以分析断裂模式。所制备的5%重量比粉煤灰基金属基复合材料表现出比其他样品更好的力学性能。因此，建议使用AF样品制造汽车和结构部件中的零件。
