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Accelerated intermetallic phase amorphization in a Mg-based high-entropy alloy powder by Sharma, Prince; Gandhi, Purvam Mehulkumar; Chintersingh, Kerri-Lee; Schoenitz, Mirko; Dreizin, Edward L.; Liou, Sz-Chian; Balasubramanian, Ganesh is a scholarly article available to read on EtoBox.

What is Accelerated intermetallic phase amorphization in a Mg-based high-entropy alloy powder about?

We describe a novel mechanism for the synthesis of a stable high-entropy alloy powder from an otherwise immiscible Mg-Ti rich metallic mixture by employing high-energy mechanical milling. The presented methodology expedites the synthesis of amorphous alloy powder by strategically injecting entropic disorder through the inclusion of multi-principal elements in the alloy composition. Predictions from first principles and materials theory corroborate the results from microscopic characterizations that reveal a transition of the amorphous phase from a precursor intermetallic structure. This transformation, characterized by the emergence of antisite disorder, lattice expansion, and the presence of nanograin boundaries, signifies a departure from the precursor intermetallic structure. Additionally, this phase transformation is accelerated by the presence of multiple principal elements that induce severe lattice distortion and a higher configurational entropy. The atomic size mismatch of the dissimilar elements present in the alloy produces a stable amorphous phase that resists reverting to an ordered lattice even on annealing.

Author

Sharma, Prince; Gandhi, Purvam Mehulkumar; Chintersingh, Kerri-Lee; Schoenitz, Mirko; Dreizin, Edward L.; Liou, Sz-Chian; Balasubramanian, Ganesh

Published

2024

Language

EN