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Influence of Process Parameters on Microstructure and Mechanical Properties ofAS21-SiC Composites through Two-Step Stir-Casting

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Abstract

This work aims to focus on fine precipitation of Mg-Si compound in AS21 alloy system by the dispersion of SiC reinforcement through stir-casting in two steps. Dual step stir-casting at a melt temperature of 680 o C, 700 o C, and 720 o C with varied stirring rates (S) manufactured the AS21 alloy composite having 2, 4 and 6 wt.% of SiC. The Taguchi L9 experiments were implemented with three processing factors (wt.% of reinforcement, melt temperature and stirring speed) at three levels in order to acquire optimum conditions. Metallographic examinations depict the formation fine grain structure and precipitation of fine Mg-Si compound with the SiC reinforcement. The ANOVA analysis identified the SiC reinforcement as the most effective parameter influencing the mechanical properties of AS21 alloy composites. The tensile strength of 199.35 MPa was attained at the optimum two-step stir casting conditions: i.e. melt temperature of 720 o C, stirring speed of 600 rpm by adding 6 wt.% of SiC in AS21 alloy. The influence of SiC variation on Mg2Si compound by duel step stir casting were discussed in detail.

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Acknowledgments

The authors acknowledge the Sophisticated Analytical Instruments Facility, DST-India for providing SEM facilities.

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The author(s) received no financial support for the research, authorship, and/or publication of this article.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Acharya Nagarjuna University, Guntur, Andhra Pradesh, 522510, India

    D. Rognatha Rao

  2. Department of Mechanical Engineering, R.V.R.&.J.C college of Engineering, Chowdavaram, Andhra Pradesh, 522019, India

    C. Srinivas

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Contributions

Conception and design of study: D Rognatha Rao

Acquisition of data: D Rognatha Rao

Analysis and/or interpretation of data: D Rognatha Rao

Drafting the manuscript: C Srinivas

Revising the manuscript critically for important intellectual content: D Rognatha Rao, C Srinivas

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Correspondence to D. Rognatha Rao.

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Rao, D.R., Srinivas, C. Influence of Process Parameters on Microstructure and Mechanical Properties ofAS21-SiC Composites through Two-Step Stir-Casting. Silicon 15, 813–827 (2023). https://doi.org/10.1007/s12633-022-02046-2

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