Abstract
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.
| Original language | American English |
|---|---|
| Pages (from-to) | 1792-1798 |
| Number of pages | 7 |
| Journal | Journal of Magnesium and Alloys |
| Volume | 12 |
| Issue number | 5 |
| DOIs | |
| State | Published - May 2024 |
ASJC Scopus subject areas
- Mechanics of Materials
- Metals and Alloys
Keywords
- Amorphous
- Antisite disorder
- High-energy milling
- High-entropy alloy
- Intermetallic