Szczegóły publikacji
Opis bibliograficzny
Duality of wave modulation and nanotwinning in Ni–Mn–Ga martensite via long-period commensurate states / Petr Veřtát, Martin Zelený, Alexei Sozinov, Milan Klicpera, Oscar Fabelo, Robert CHULIST, Mariia Vinogradova, Petr Sedlák, Hanuš Seiner, Oleg Heczko, Ladislav Straka // Acta Materialia ; ISSN 1359-6454 . — Tytuł poprz.: Acta Metallurgica et Materialia. — 2026 — vol. 317 art. no. 122510, s. 1–17. — Bibliogr. s. 16–17, Abstr. — Publikacja dostępna online od: 2026-07-03
Autorzy (11)
- Veřtát Petr
- Zelený Martin
- Sozinov Alexei
- Klicpera Milan
- Fabelo Oscar
- AGHChulist Robert
- Vinogradova Mariia
- Sedlák Petr
- Seiner Hanuš
- Heczko Oleg
- Straka Ladislav
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 169572 |
|---|---|
| Data dodania do BaDAP | 2026-09-22 |
| Tekst źródłowy | URL |
| DOI | 10.1016/j.actamat.2026.122510 |
| Rok publikacji | 2026 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Acta Materialia |
Abstract
Structural modulation is a key ingredient behind the extraordinary (magneto)elastic response of Ni–Mn–Ga martensite, yet its link to fine microstructural features and twin-boundary supermobility remains unresolved. Here we analyse martensitic single crystals of Ni50.0Mn27.7Ga22.3 and Ni50.0Mn28.1Ga21.9. Neutron and X-ray diffraction reveal an anharmonic five-layer structural modulation—evidenced by high-order satellite reflections—that evolves from commensurate ( q = 2/5) to incommensurate (2/5 < q < 5/12) upon cooling. Interpreting the refined modulation displacements as a basal-plane stacking sequence links the wave description to the microstructural evolution on cooling. In this view, evolving incommensurability produces periodic nanodomains interpreted as emerging a/b -nanotwins with a characteristic size of ≈20 nm at ≈290 K. With further cooling, the modulation can lock into long-period commensurate (LP-C) states, such as 34O ( q = 7/17), 24O ( q = 5/12), and 14O ( q = 3/7), whose orthorhombic unit cells can be viewed as a/b -nanotwins. Ab initio calculations show that LP-C structures are energetically competitive with the initial commensurate state, supporting a shallow martensitic energy landscape. We propose a physical picture in which the martensitic transformation selects a commensurate state with q = 2/5 in the Mn-rich compositions studied here, while subsequent cooling drives relaxation within the martensitic landscape toward LP-C states, particularly 24O in the present alloys. The resulting structure is neither purely wave-like nor purely nanotwinned; rather, it reflects coupling between a coherent modulation wave and local accommodation via NM-like tetragonal distortions, nanotwinning, and LP-C lock-ins, providing a structural basis for the wave–nanotwin duality in Ni–Mn–Ga martensite.
