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Effect of Thixoforming on the Microstructure and Tensile Properties of A356 Alloy and A356-5TiB2 In-situ Composite

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Abstract

In the present work, A356 alloy and in situ A356-5TiB2 composite feedstock was produced by employing Cooling slope casting technique. The technique resulted in near spherical morphology of primary α-Al phase in the feedstock of both the alloy and composite. A fine distribution of eutectic Si phase within the matrix was observed in the composite feedstock. The rheocast billets of both the alloy and composite were then thixoformed successfully at 50 % solid fraction temperatures of 580 and 585 °C respectively. Further, tensile properties of thixoformed alloy and composite were measured and compared with those of gravity-cast samples. It was observed that the % increase in yield strength and tensile strength of thixoformed alloy increased by 43 and 36 % respectively with respect to the gravity-cast alloy. The thixoformed composite attained the highest ultimate tensile strength of 211 MPa which is about 40 % higher as compared to gravity-cast alloy. Interestingly, the ductility of the composites is comparable to that of alloy after thixoforming.

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Acknowledgments

The authors gratefully acknowledge the support received from Melting and Casting Laboratory, Indian Institute of Technology Kharagpur for executing the thixoforming experiments and the support extended by Central Research Facility (CRF) at IIT Kharagpur towards materials characterization.

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Authors and Affiliations

  1. School of Mechanical Sciences, Indian Institute of Technology Bhubaneswar, Bhubaneswar, 751007, Odisha, India

    S. Deepak Kumar

  2. School of Minerals, Metallurgical and Materials Engineering, Indian Institute of Technology Bhubaneswar, Bhubaneswar, 751007, Odisha, India

    A. Mandal

  3. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur, 721302, West Bengal, India

    M. Chakraborty

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  1. S. Deepak Kumar
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  2. A. Mandal
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  3. M. Chakraborty
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Correspondence to S. Deepak Kumar.

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Deepak Kumar, S., Mandal, A. & Chakraborty, M. Effect of Thixoforming on the Microstructure and Tensile Properties of A356 Alloy and A356-5TiB2 In-situ Composite. Trans Indian Inst Met 68 (Suppl 2), 123–130 (2015). https://doi.org/10.1007/s12666-015-0521-0

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  • DOI: https://doi.org/10.1007/s12666-015-0521-0

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