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Sofronie M, Tolea M, Popescu B, Enculescu M, Tolea F. Magnetic and Magnetostrictive Properties of Ni50Mn20Ga27Cu3 Rapidly Quenched Ribbons. MATERIALS (BASEL, SWITZERLAND) 2021; 14:5126. [PMID: 34576350 PMCID: PMC8471753 DOI: 10.3390/ma14185126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Revised: 08/26/2021] [Accepted: 09/02/2021] [Indexed: 11/17/2022]
Abstract
The influence of the rapid solidification technique and heat treatment on the martensitic transformation, magnetic properties, thermo- and magnetic induced strain and electrical resistivity is investigated for the Cu doped NiMnGa Heusler-based ferromagnetic shape memory ribbons. The martensitic transformation temperatures are unexpectedly low (below 90 K-which can be attributed to the disordered texture as well as to the uncertainty in the elements substituted by the Cu), preceded by a premartensitic transformation (starting at around 190 K). A thermal treatment slightly increases the transformation as well as the Curie temperatures. Additionally, the thermal treatment promotes a higher magnetization value of the austenite phase and a lower one in the martensite. The shift of the martensitic transformation temperatures induced by the applied magnetic field, quantified from thermo-magnetic and thermo-magnetic induced strain measurements, is measured to have a positive value of about 1 K/T, and is then used to calculate the transformation entropy of the ribbons. The magnetostriction measurements suggest a rotational mechanism in low fields for the thermal treated samples and a saturation tendency at higher magnetic fields, except for the temperatures close to the phase transition temperatures (saturation is not reached at 5 T), where a linear volume magnetostriction cannot be ruled out. Resistivity and magnetoresistance properties have also been measured for all the samples.
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Affiliation(s)
| | | | | | | | - Felicia Tolea
- National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania; (M.S.); (M.T.); (B.P.); (M.E.)
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Unzueta I, de R-Lorente DA, Cesari E, Sánchez-Alarcos V, Recarte V, Pérez-Landazábal JI, García JA, Plazaola F. Experimental Observation of Vacancy-assisted Martensitic Transformation Shift in Ni-Fe-Ga Alloys. PHYSICAL REVIEW LETTERS 2019; 122:165701. [PMID: 31075017 DOI: 10.1103/physrevlett.122.165701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Indexed: 06/09/2023]
Abstract
Positron annihilation lifetime spectroscopy is used to experimentally demonstrate the direct relationship between vacancies and the shift of the martensitic transformation temperature in a Ni_{55}Fe_{17}Ga_{28} alloy. The evolution of vacancies assisting the ordering enables shifts of the martensitic transformation up to 50 K. Our results confirm the role that both vacancy concentration and different vacancy dynamics play in samples quenched from the L2_{1} and B2 phases, which dictate the martensitic transformation temperature and its subsequent evolution. Finally, by electron-positron density functional calculations V_{Ni} is identified as the most probable vacancy present in Ni_{55}Fe_{17}Ga_{28}. This work evidences the capability of vacancies for the fine-tuning of the martensitic transformation temperature, paving the way for defect engineering of multifunctional properties.
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Affiliation(s)
- I Unzueta
- Department of Electricity and Electronics, University of the Basque Country UPV/EHU, 48940 Leioa, Spain
- BCMaterials, University of Basque Country UPV/EHU, 48940 Leioa, Spain
| | - D Alonso de R-Lorente
- Department of Science, Universidad Pública de Navarra, Campus de Arrosadía, 31006 Pamplona, Spain
| | - E Cesari
- Department of Physics, Universitat de les Illes Balears, Ctra. de Valldemossa, km 7.5, E-07122, Palma de Mallorca, Spain
| | - V Sánchez-Alarcos
- Department of Science, Universidad Pública de Navarra, Campus de Arrosadía, 31006 Pamplona, Spain
- Institute for Advanced Materials (INAMAT), Universidad Pública de Navarra, Campus de Arrosadía, 31006 Pamplona, Spain
| | - V Recarte
- Department of Science, Universidad Pública de Navarra, Campus de Arrosadía, 31006 Pamplona, Spain
- Institute for Advanced Materials (INAMAT), Universidad Pública de Navarra, Campus de Arrosadía, 31006 Pamplona, Spain
| | - J I Pérez-Landazábal
- Department of Science, Universidad Pública de Navarra, Campus de Arrosadía, 31006 Pamplona, Spain
- Institute for Advanced Materials (INAMAT), Universidad Pública de Navarra, Campus de Arrosadía, 31006 Pamplona, Spain
| | - J A García
- BCMaterials, University of Basque Country UPV/EHU, 48940 Leioa, Spain
- Department of Applied Physics II, University of the Basque Country UPV/EHU, 48940 Leioa, Spain
| | - F Plazaola
- Department of Electricity and Electronics, University of the Basque Country UPV/EHU, 48940 Leioa, Spain
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Acet M, Mañosa L, Planes A. Magnetic-Field-Induced Effects in Martensitic Heusler-Based Magnetic Shape Memory Alloys. HANDBOOK OF MAGNETIC MATERIALS 2011. [DOI: 10.1016/b978-0-444-53780-5.00004-1] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
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