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Synthesis, Characterization and Thermal Stability of Nanocrystalline MgAlMnFeCu Low-Density High-Entropy Alloy

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Abstract

An equiatomic quinary MgAlMnFeCu high-entropy alloy (HEA) has been synthesized successfully by mechanical alloying (MA). Phase evolution of MgAlMnFeCu HEA has been studied using X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy-dispersive spectroscopy (EDS/XEDS). Milling up to 60 h leads to the formation of a mixture of two phases consisting of a BCC phase (a = 2.87 ± 0.02 Å) and ϒ-brass-type phase (a = 8.92 ± 0.03 Å), with ~ 2 μm powder particle size. The as-milled alloy after spark plasma sintering (SPS) at 900 °C exhibits an experimental density of 4.946 ± 0.13 g cc−1, which is 99.80% of the theoretical density. SPS leads to the formation of C15 Laves phase (MgCu2-type; a = 7.034 ± 0.02 Å) and B2 (AlFe-type; (a = 2.89 ± 0.02 Å) intermetallic along with the ϒ-brass-type phase. The SPSed sample has exceptional hardness value (~ 5.06 GPa), high compressive strength (~ 1612 MPa) and appreciable failure strain (~ 6.4%) coupled with relatively low density. Various thermodynamic parameters have been considered for understanding the phase evolution and their stability during MA.

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Acknowledgments

The authors would like to thank Profs. S Lele, R K Mandal, B S Murty and Dr. B Mukherjee for many stimulating discussions. The authors also thank Dr. R Manna for extending the facilities of the Advanced Research Centre for Iron and Steel (ARCIS) as its Coordinator.

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Authors and Affiliations

  1. Department of Metallurgical Engineering, Indian Institute of Technology (BHU), Varanasi, Uttar Pradesh, 221005, India

    Vivek Kumar Pandey, Yagnesh Shadangi, Vikas Shivam, Joysurya Basu, Kausik Chattopadhyay, B. N. Sarma & Nilay Krishna Mukhopadhyay

  2. Defence Institute of Advanced Technology (DIAT), Pune, 411025, India

    Bhaskar Majumdar

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  1. Vivek Kumar Pandey
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Pandey, V.K., Shadangi, Y., Shivam, V. et al. Synthesis, Characterization and Thermal Stability of Nanocrystalline MgAlMnFeCu Low-Density High-Entropy Alloy. Trans Indian Inst Met 74, 33–44 (2021). https://doi.org/10.1007/s12666-020-02114-4

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