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Processing and Consolidation of Nanocrystalline Cu-Zn-Ti-Fe-Cr High-Entropy Alloys via Mechanical Alloying

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Abstract

In the current investigation, nanocrystalline multicomponent high-entropy alloys (HEAs) have been synthesized in the Cu x Zn y Ti20Fe20Cr20 system (x/y = 1/0, 3/1, 1; and x + y = 40) by mechanical alloying and subsequently consolidated using spark plasma sintering (SPS) in argon atmosphere at a pressure of 50 MPa. A detailed X-ray diffraction and transmission electron microscopy study reveals the presence of both FCC copper solid-solution, (Cu)ss and BCC chromium solid-solution, (Cr)ss phases in both the mechanically alloyed powders as well as the sintered compacts. The phase formation and stability of the sintered multicomponent Cu x Zn y Ti20Fe20Cr20 with x/y = 3/1 and x + y = 40 pellet have been studied at different sintering temperatures, i.e., 873 K, 973 K, 1073 K, and 1173 K (600 °C, 700 °C, 800 °C, and 900 °C). The important findings include that high Vickers bulk hardness of around 6 GPa and relative density of around 95 pct reported in the Cu x Zn y Ti20Fe20Cr20 with x/y = 3/1 and x + y = 40 HEAs, SPSed at 1173 K (900 °C). The formation, consolidation, and microstructural details are analyzed critically and discussed.

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Acknowledgments

The authors would like to thank Indian Space Research Organization (ISRO) for funding. They would also like to thank the Department of Science and Technology (DST) and the IIT Kanpur for funding the SPS facility.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, UP, India

    Sanghita Mridha (Research Scholar), Sumanta Samal (Research Scholar), P. Yousaf Khan (Research Scholar) & Krishanu Biswas (Associate Professor)

  2. Materials Science Division, Vikram Sarabhai Space Centre, Indian Space Research Organization (ISRO), Trivandrum, 695022, Kerala, India

    Govind (Scientist E)

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  1. Sanghita Mridha
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  2. Sumanta Samal
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  3. P. Yousaf Khan
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Corresponding author

Correspondence to Krishanu Biswas.

Additional information

Sumanta Samal and Yousaf Khan made equal contribution.

Manuscript submitted February 14, 2013.

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Mridha, S., Samal, S., Khan, P.Y. et al. Processing and Consolidation of Nanocrystalline Cu-Zn-Ti-Fe-Cr High-Entropy Alloys via Mechanical Alloying. Metall Mater Trans A 44, 4532–4541 (2013). https://doi.org/10.1007/s11661-013-1824-6

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  • DOI: https://doi.org/10.1007/s11661-013-1824-6

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