Effect of TiB<sub>2</sub> and Al<sub>3</sub>Ti on the microstructure, mechanical properties and fracture behaviour of near eutectic Al−12.6Si alloy

Surajit Basak; Prosanta Biswas; Surajit Patra; Himadri Roy; Manas Kumar Mondal

doi:10.1007/s12613-020-2070-8

Volume 28 Issue 7

Jul. 2021

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2021 > 28(7): 1174-1185

Surajit Basak, Prosanta Biswas, Surajit Patra, Himadri Roy, and Manas Kumar Mondal, 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(2021), No. 7, pp. 1174-1185. https://doi.org/10.1007/s12613-020-2070-8

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Surajit Basak, Prosanta Biswas, Surajit Patra, Himadri Roy, and Manas Kumar Mondal, 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(2021), No. 7, pp. 1174-1185. https://doi.org/10.1007/s12613-020-2070-8

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Research Article

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

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Corresponding author:
Manas Kumar Mondal E-mail: manas.nitdgp@gmail.com
Received: 15 January 2020; Revised: 7 April 2020; Accepted: 15 April 2020; Available online: 16 April 2020

Abstract

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 (E_Si) and coarse polygonal primary silicon (P_Si) particles in the matrix-like α-Al phase. The P_Si, E_Si, 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 Al−5Ti−1B modified alloys have a more ductile mode of fracture and more dimples compared to the unmodified alloy.
- Al−Si alloy;
- Al−5Ti−1B modification;
- modification mechanism;
- mechanical properties;
- fracture analysis

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