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| Autores principales: | , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2401.15197 |
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| _version_ | 1866909201408720896 |
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| author | Sharma, Prince Gandhi, Purvam Mehulkumar Chintersingh, Kerri-Lee Schoenitz, Mirko Dreizin, Edward L. Liou, Sz-Chian Balasubramanian, Ganesh |
| author_facet | Sharma, Prince Gandhi, Purvam Mehulkumar Chintersingh, Kerri-Lee Schoenitz, Mirko Dreizin, Edward L. Liou, Sz-Chian Balasubramanian, Ganesh |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_15197 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Accelerated intermetallic phase amorphization in a Mg-based high-entropy alloy powder Sharma, Prince Gandhi, Purvam Mehulkumar Chintersingh, Kerri-Lee Schoenitz, Mirko Dreizin, Edward L. Liou, Sz-Chian Balasubramanian, Ganesh Materials Science 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. |
| title | Accelerated intermetallic phase amorphization in a Mg-based high-entropy alloy powder |
| topic | Materials Science |
| url | https://arxiv.org/abs/2401.15197 |