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Influences of Centrifugal Force on the Microstructure, Metallurgical Features, and Mechanical Behavior of Centrifugally Cast Al-Mg2Si in-situ Functionally Graded Composites

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Abstract

In present research, the effect of the amount of Mg addition on both the microstructural and mechanical characteristics of functionally graded A356-Mg2Sip in-situ composites developed via centrifugal casting technique was investigated. This research has been divided into three sections: microstructural analysis, mechanical analysis, and metallurgical analysis of A356-Mg2Si in-situ composites composed of A356 Al matrix with different Mg concentrations (5 and 10%). The matrix material consisted of a commercial pure A356 alloy (Al-7.0Si-0.3 Mg), and the primary Mg2Si reinforcement particles have been produced in-situ using a process based on chemical reaction. Zone-wise the mechanical characteristics of the cast FG composite, such as tensile strengths that are distributed from the innermost to the outermost circumference, have been studied at room temperature as well as elevated temperatures.The optical microscope (OM) and scanning electron microscopy (SEM) were used to examine the structure of the grains and Mg2Si morphologies of FG-composites. X-ray diffraction (XRD) examination was utilized in order to show the presence of composite primary phases in addition to fragmented Mg2Si particles. To establish the presence of α-Al, β-phases, and π-phases in the cast FG-composites, an EDS examination was performed rather than OM and SEM.Whenever the test temperatures increase, the fracture response shows that the type of fracture shifts from mixed mode into ductile mode. Failure occurs at lower temperatures during testing because of the eutectic Si & Fe intermetallics fractures, whereas at higher temperatures the Al matrix softens and reduces the tensile strength associated with the particle–matrix interfaces. The interfacial regions represent the starting points for cracking.

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Acknowledgements

The authors are extremely thankful to Indian Institute of Technology (BHU), Varanasi-India for providing the well equipped laboratories and central Instruments facility (CIF) to conduct the experimental work presented in this manuscript.

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All authors contributed their full effort during the preparation of the present manuscript and study of the work.

1. Dr. S.C. Ram: Synthesis and characterization, data collection, analysis, and prepared the first draft of the manuscript.

2. Dr.Awani Bhushan: Draft file read approved the final manuscript and consistently guide during draft preparation.

3. Dr.Mukesh Raushan Kumar: Consistently help in experimental work and analysis of microstructural features.

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Correspondence to S. C. Ram.

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Ram, S.C., Bhushan, A. & Kumar, M.R. Influences of Centrifugal Force on the Microstructure, Metallurgical Features, and Mechanical Behavior of Centrifugally Cast Al-Mg2Si in-situ Functionally Graded Composites. Silicon 16, 783–800 (2024). https://doi.org/10.1007/s12633-023-02724-9

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