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Effect of Strain Induced Melt Activation Process on the Microstructure and Mechanical Properties of Al-5Ti-1B Treated Al-7Si Alloy

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Abstract

In this study, simultaneous effects of modified strain induced melt activation (M-SIMA) process and addition of Al-5Ti-1B chemical grain refiner on the casting defects, microstructural features, and mechanical properties of hypoeutectic Al-7Si alloys are investigated. The traditional melting and casting techniques were used to develop cast ingots of unrefined and grain refined structures of Al-7Si alloy. Addition of chemical refiner Al-5Ti-1B to Al-7Si melt could significantly change the secondary dendritic arm spacing and eutectic Si particle size to 31% and 28%, respectively. In the M-SIMA process, cast ingots were 60% warm deformed and heat-treated at mushy zone at temperature 585 °C for 30 min. Spherical morphology of α-Al grain and fine fibrous type eutectic Si are observed after M-SIMA process. Grain size of α-Al and eutectic Si are further reduced to 56% and 40% after M-SIMA process of grain refined Al-7Si alloy. Porosity and micro-cracks are also minimized after M-SIMA process. Microstructural features of cast and M-SIMA processed alloys were characterized through optical and scanning electron microscopy. X-ray diffraction techniques reveal the different phases present in the developed alloy. TEM analysis further confirms the presence of TiAl3 and Ti7Al5Si14 precipitates in grain refined Al-7Si alloy. A significant improvement of 132% in hardness (HV), 76% in yield strength, 120% in ultimate tensile strength, 125% in elongation to fracture, and 116% in specific ultimate tensile strength are obtained in M-SIMA processed grain refined Al-7Si alloy. Fractography analysis reveals the mixed mode of fracture in M-SIMA processed Al-7Si alloy with refined structure compared to brittle fracture of unrefined cast alloy.

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Acknowledgements

The authors would like to thank the authority of the National Institute of Technology (NIT), Durgapur, and CSIR-National Metallurgical Laboratory (CSIR-NML), Jamshedpur, for their permission to carry out this research work as a joint venture of these two establishments.

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Authors and Affiliations

  1. Mechanical Engineering Department, Maharashtra Institute of Technology, Aurangabad, 431010, India

    Chandan Choudhary

  2. Department of Metallurgical and Materials Engineering, National Institute of Technology, Mahatma Gandhi Avenue, Durgapur, 713209, India

    Chandan Choudhary & Durbadal Mandal

  3. Material Engineering Division, CSIR-National Metallurgical Laboratory, Jamshedpur, 831007, India

    H. N. Bar, A. K. Pramanick & K. L. Sahoo

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  1. Chandan Choudhary
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  2. H. N. Bar
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  3. A. K. Pramanick
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  4. K. L. Sahoo
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  5. Durbadal Mandal
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Correspondence to Durbadal Mandal.

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Choudhary, C., Bar, H.N., Pramanick, A.K. et al. Effect of Strain Induced Melt Activation Process on the Microstructure and Mechanical Properties of Al-5Ti-1B Treated Al-7Si Alloy. Met. Mater. Int. 28, 2529–2542 (2022). https://doi.org/10.1007/s12540-021-01154-9

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  • DOI: https://doi.org/10.1007/s12540-021-01154-9

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