Nagaraja Santhosh, Kodandappa Ramesha, Ansari Khalid, Kuruniyan Mohamed Saheer, Afzal Asif, Kaladgi Abdul Razak, Aslfattahi Navid, Saleel C Ahamed, Gowda Ashwin C, Bindiganavile Anand Praveena
Department of Mechanical Engineering, MVJ College of Engineering, Near ITPB, Whitefield, Bangalore 560067, India.
Department of Mechanical Engineering, School of Engineering and Technology, CHRIST (Deemed to be University), Bangalore 560074, India.
Materials (Basel). 2021 Sep 13;14(18):5261. doi: 10.3390/ma14185261.
The effect of reinforcements and thermal exposure on the tensile properties of aluminium AA 5083-silicon carbide (SiC)-fly ash composites were studied in the present work. The specimens were fabricated with varying wt.% of fly ash and silicon carbide and subjected to T6 thermal cycle conditions to enhance the properties through "precipitation hardening". The analyses of the microstructure and the elemental distribution were carried out using scanning electron microscopic (SEM) images and energy dispersive spectroscopy (EDS). The composite specimens thus subjected to thermal treatment exhibit uniform distribution of the reinforcements, and the energy dispersive spectrum exhibit the presence of Al, Si, Mg, O elements, along with the traces of few other elements. The effects of reinforcements and heat treatment on the tensile properties were investigated through a set of scientifically designed experimental trials. From the investigations, it is observed that the tensile and yield strength increases up to 160 °C, beyond which there is a slight reduction in the tensile and yield strength with an increase in temperature (i.e., 200 °C). Additionally, the % elongation of the composites decreases substantially with the inclusion of the reinforcements and thermal exposure, leading to an increase in stiffness and elastic modulus of the specimens. The improvement in the strength and elastic modulus of the composites is attributed to a number of factors, i.e., the diffusion mechanism, composition of the reinforcements, heat treatment temperatures, and grain refinement. Further, the optimisation studies and ANN modelling validated the experimental outcomes and provided the training models for the test data with the correlation coefficients for interpolating the results for different sets of parameters, thereby facilitating the fabrication of hybrid composite components for various automotive and aerospace applications.
在本研究中，对增强材料和热暴露对AA 5083铝合金-碳化硅（SiC）-粉煤灰复合材料拉伸性能的影响进行了研究。制备了含有不同重量百分比粉煤灰和碳化硅的试样，并对其进行T6热循环处理，以通过“沉淀硬化”提高性能。利用扫描电子显微镜（SEM）图像和能谱仪（EDS）对微观结构和元素分布进行了分析。经过热处理的复合材料试样显示出增强材料的均匀分布，能谱显示存在Al、Si、Mg、O元素，以及少量其他元素的痕迹。通过一系列科学设计的试验研究了增强材料和热处理对拉伸性能的影响。从研究中可以观察到，拉伸强度和屈服强度在160°C时增加，超过该温度后，随着温度升高（即200°C），拉伸强度和屈服强度略有下降。此外，随着增强材料的加入和热暴露，复合材料的伸长率大幅降低，导致试样的刚度和弹性模量增加。复合材料强度和弹性模量的提高归因于多种因素，即扩散机制、增强材料的成分、热处理温度和晶粒细化。此外，优化研究和人工神经网络建模验证了实验结果，并为测试数据提供了训练模型，其相关系数可用于内插不同参数集的结果，从而便于制造用于各种汽车和航空航天应用的混合复合材料部件。
