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Development of a Multi-phase AlCuTaVW High-Entropy Alloy Using Powder Metallurgy Route and its Mechanical Properties

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Abstract

Equiatomic AlCuTaVW high-entropy alloy (HEA) composition have resulted in a single-phase solid solution with a bcc crystal structure after 25 h of ball milling. Two fcc phases and an ordered B2 phase have evolved during spark plasma sintering at 1523 K. The morphology of sintered disc contains a continuous bright phase and a discontinuous dark phase. The dark phase is detected to be Al-rich. Microhardness of the sintered product is 13 ± 1 GPa, and it is very high compared to other HEAs, conventional ceramics and cermets. A fracture toughness of 8.36 MPa m1/2 is measured from the cracks generated along the edges of Vickers indentation.

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Acknowledgements

DST-PURSE and DST-FIST programs of School of Engineering Sciences and Technology, University of Hyderabad are gratefully acknowledged for supporting this research work. The authors are thankful to Mr. PVV Srinivas of the International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad 500005, India, for assisting with spark plasma sintering.

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Authors and Affiliations

  1. School of Engineering Sciences and Technology, University of Hyderabad, Hyderabad, 500046, India

    Ramya Sree Ganji & Koteswararao V. Rajulapati

  2. Pratt &Whitney Chair, School of Engineering Sciences and Technology, University of Hyderabad, Hyderabad, 500046, India

    K. Bhanu Sankara Rao

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  1. Ramya Sree Ganji
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  2. Koteswararao V. Rajulapati
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  3. K. Bhanu Sankara Rao
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Correspondence to Koteswararao V. Rajulapati.

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Ganji, R.S., Rajulapati, K.V. & Rao, K.B.S. Development of a Multi-phase AlCuTaVW High-Entropy Alloy Using Powder Metallurgy Route and its Mechanical Properties. Trans Indian Inst Met 73, 613–618 (2020). https://doi.org/10.1007/s12666-020-01875-2

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