Structural Model of Phase Transitions in Manganese Determined by the Closest Spiral Packing of Tetrahedrons

• Published in: Metal science and heat treatment Vol. 65; no. 1-2; pp. 122 - 126
• Main Authors: Talis, A. L., Kraposhin, V. S.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-05-2023; Springer; Springer Nature B.V
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Cubic lattice; Engineering Thermodynamics; Heat and Mass Transfer; Heat treatment; Icosahedrons; Lattice parameters; Manganese; Materials Science; Metallic Materials; Phase transitions; Structural models; Structure and Phase Transformations; Tetrahedra; spiral packing of tetrahedrons; phase transitions; close-packed metals; succession of periodic approximants
• ISSN: 0026-0673; 1573-8973
• DOI: 10.1007/s11041-023-00901-6

A single structural model for the experimentally determined succession of phase transitions between cubic α-, β-, γ- and δ-modifications of Mn, in which the lattice constants of the modifications decrease with the temperature growth is suggested. The model is based on the definition of the Mn phases as successive periodic approximants of a linear substructure of a four-dimensional analog of an icosahedron. The model seems to be appropriate for an adequate description of structural transformations in close-packed metals and of variation of their structure-sensitive properties under heat treatment.