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Effect of TiB2 and Al3Ti on the microstructure, mechanical properties and fracture behaviour of near eutectic Al-12.6Si alloy

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Abstract

A near eutectic Al-12.6Si alloy was developed with 0.0wt%, 2.0wt%, 4.0wt%, and 6.0wt% Al-5Ti-1B master alloy. The microstructural morphology, hardness, tensile strength, elongation, and fracture behaviour of the alloys were studied. The unmodified Al-12.6Si alloy has an irregular needle and plate-like eutectic silicon (ESi) and coarse polygonal primary silicon (PSi) particles in the matrix-like α-Al phase. The PSi, ESi, and α-Al morphology and volume fraction were changed due to the addition of the Al-5Ti-1B master alloy. The hardness, UTS, and elongation improved due to the microstructural modification. Nano-sized in-situ Al3Ti particles and ex-situ TiB2 particles caused the microstructural modification. The fracture images of the developed alloys exhibit a ductile and brittle mode of fracture at the same time. The Alα5Tiα1B modified alloys have a more ductile mode of fracture and more dimples compared to the unmodified alloy.

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Acknowledgement

The authors are very thankful to Mr. S. C. Das and Mr. M. K. Das of the National Institute of Technology Durgapur, India, for their support in several phases of this investigation. The authors would also like to thank NIT, Durgapur RIG#2 project for financial support and the Director of National Institute of Technology Durgapur, India, for his continuous encouragement.

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Correspondence to Manas Kumar Mondal.

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Basak, S., Biswas, P., Patra, S. et al. Effect of TiB2 and Al3Ti on the microstructure, mechanical properties and fracture behaviour of near eutectic Al-12.6Si alloy. Int J Miner Metall Mater 28, 1174–1185 (2021). https://doi.org/10.1007/s12613-020-2070-8

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