Abstract
The present work aims at understanding the microstructure and mechanical property correlation of hypo (Mg-0.5, 0.7, 1.15 wt% Si) and hyper (Mg-2, 4, 6, 8 and 10 wt% Si) eutectic binary Mg-Si alloys. The microstructures of hypoeutectic alloys consist of α-Mg and lamellar Mg-Mg2Si eutectic phases; whereas the microstructures of hypereutectic alloys consist of primary Mg2Si, Chinese script eutectic Mg2Si and α-Mg phases depending upon the Si content. Significant increase in hardness values of these alloys was observed as a function of Si content which is due to the presence of hard Mg2Si phase. In the hypereutectic alloys, the average microhardness of primary Mg2Si was about ten times higher than that of α-Mg. Compressive behaviour, tensile properties (UTS, YS and %E) at the room temperature (RT) as well as at 150 °C, elevated temperatures (ET) were analyzed and reported as follows: compressive strength of Mg-Si alloys has improved with the increase of Si content, Mg with 2 to 4 % Si shows good tensile properties at RT and ET. Alloys containing high Si content show a marginal reduction in strength at high temperatures due to the presence of the thermally stable Mg2Si.
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Acknowledgements
The author wishes to acknowledge the Council of Scientific and Industrial Research [CSIR], Govt. of India and to thank the casting and characterization facilities provided by MatRICS – Materials Research and Innovation Centric Solutions, Vellimalai, Kanyakumari District, India, Tel: +91 91766 06699; web: www.matricstech.com. The help received from Mr. Hari Krishnan, Mr. Ajukumar, Mr. S. Prasanth and Mr. Abhilash Viswanath during the experiments is highly acknowledged.
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K.K. Ajith Kumar, A Srinivasan, U. T. S. Pillai, B C. Pai and M. Chakraborty contributed to the design, implementation of the research and for preparing the manuscript.
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Ajith Kumar, K.K., Srinivasan, A., Pillai, U.T.S. et al. Microstructure and Mechanical Property Correlation of Mg-Si Alloys. Silicon 14, 9499–9515 (2022). https://doi.org/10.1007/s12633-021-01521-6
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DOI: https://doi.org/10.1007/s12633-021-01521-6