Magnetic properties, martensitic and magnetostructural transformations of ferromagnetic Ni-Mn-Sn-Cu shape memory alloys
| Autor: | Julian M. Gonzalez, Joan Josep Suñol, Eloi Pineda, Artem Lynnyk, O. M. Chumak, Asma Wederni, Adam Nabiałek, Mohamed Khitouni, Mihail Ipatov, Lluisa Escoda, Safia Alleg, Ryszard Żuberek |
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| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. GCM - Grup de Caracterització de Materials |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Phase transition
Materials science Enginyeria química::Indústries químiques::Aliatges [Àrees temàtiques de la UPC] 02 engineering and technology 01 natural sciences Differential scanning calorimetry Phase (matter) 0103 physical sciences Magnetic properties Alloys General Materials Science 010302 applied physics Austenite General Chemistry Cu additions 021001 nanoscience & nanotechnology Crystallography Ferromagnetism Phase transitions Martensite Diffusionless transformation Martensitic transformation Aliatges Heusler alloys Melt spinning 0210 nano-technology |
| Zdroj: | UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| Popis: | The influence of Cu doping on structural and magnetic properties of Ni50−xMn36Sn14−yCux,y (x = 0, 1, 2 and y = 1 at.%) ribbons produced by melt spinning has been investigated. The crystalline structures of the alloys were determined by X-ray diffraction (XRD) patterns analysis XRD measurements. Cu addition in specific sites shifts structural transition temperatures. The L21 austenite is found for x = 0, 1 and 2 and modulated martensitic structure for y = 1. Characteristic transformation temperatures were obtained from differential scanning calorimetry scans. It is found that the addition of Cu for Ni stabilizes the austenite phase (increasing martensitic start temperature from 194 to 228 K), whereas replacing small amounts of Cu for Sn stabilizes the modulated martensite phase (increasing martensitic transformation temperature from 194 to 325 K). The transformation temperatures generally increases as the Cu content increases. Therefore, the magnetostructural transition, analysed by vibrating sample magnetometry, is tuned by appropriate Cu doping in the alloys. Likewise, both martensitic and austenitic states exhibit ferromagnetic behaviour. |
| Databáze: | OpenAIRE |
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