Microstructures and magnetic properties of rapidly solidified Ni54Fe27-2xGa19+2x ferromagnetic Heusler alloys

Aich, S.; Das, S.; Al-Omari, I. A.; Alagarsamy, P.; Chowdhury, S. G.; Chakraborty, M.; Shield, J. E.; Sellmyer, D. J.
April 2009
Journal of Applied Physics;Apr2009, Vol. 105 Issue 7, p07A943
Academic Journal
Rapidly solidified Ni54Fe27-2xGa19+2x (x=0, 1, 2, 3, and 4) ferromagnetic shape memory alloys were made by melt-spinning with variation of Fe and Ga contents to report on the martensitic phase transformation, microstructures, and magnetic properties. Rapid solidification produced pure L21 phase by preventing the formation of γ-phase. To study the effect of heat treatment on the phase transitions, microstructures, and the magnetic properties, the melt-spun ribbons were partly heat treated at different temperatures of 800, 900, 1000, 1100, and 1200 K with holding times of 5, 10, and 15 min followed by either water quenching or air cooling. The microstructures of the as-spun ribbons as revealed by electron microscopy studies exhibited a gradual transition from cellular to dendritic structure with increasing Ga concentration and with the presence of some internal martensitic twin bands at higher Ga content. The ribbons exhibited very low coercivity with high saturation magnetization, as high as ∼87 emu/g (decreasing with Ga concentration). The above-ambient Curie temperature (TC) and the subambient martensitic transition temperature (Tm) were observed to be ∼320 and ∼195 K, respectively. At higher heat treatment temperatures formation of ductile γ phases was observed.


Related Articles

  • Magnetic investigation of Ni50Mn33In12Ga5 alloy. Pramanick, S.; Chatterjee, S.; Majumdar, S. // AIP Conference Proceedings;Feb2013, Vol. 1512 Issue 1, p1088 

    We have investigated the transport and magnetic properties of the ferromagnetic shape memory alloy of nominal composition Ni50Mn33In12Ga5. The alloy is the outcome of 5% Ga doping at the In site of the Heusler alloy Ni50Mn33In12. The resulting Ga-doped alloy orders ferromagnetically at 300 K and...

  • The effects of alloying element Co on Ni-Mn-Ga ferromagnetic shape memory alloys from first-principles calculations. Jing Bai; Raulot, Jean-Marc; Yudong Zhang; Esling, Claude; Xiang Zhao; Liang Zuo // Applied Physics Letters;4/18/2011, Vol. 98 Issue 16, p164103 

    The effects of Co addition on the properties of Ni8-xMn4Ga4Cox ferromagnetic shape memory alloys are systematically investigated by first-principles calculations. The formation energy results indicate that the added Co preferentially occupies the Ni sites in Ni2MnGa alloy. The total energy...

  • Electrical control of the ferromagnetic phase transition in cobalt at room temperature. Chiba, D.; Fukami, S.; Shimamura, K.; Ishiwata, N.; Kobayashi, K.; Ono, T. // Nature Materials;Nov2011, Vol. 10 Issue 11, p853 

    Electrical control of magnetic properties is crucial for device applicationsin the field of spintronics. Although the magnetic coercivity or anisotropy has been successfully controlled electrically in metals as well as in semiconductors, the electrical control of Curie temperature has been...

  • Preferred site occupation and magnetic properties of Ni-Fe-Ga-Co ferromagnetic shape memory alloys by first-principles calculations. Jing Bai; Yue Chen; Ze Li; Pan Jiang; Pu Wei; Xiang Zhao // AIP Advances;2016, Vol. 6 Issue 12, p1 

    First-principles calculations have been used to investigate the effects of Co addition on the preferred site occupation and magnetic properties of Ni-Fe-Ga-Co ferromagnetic shape memory alloys. The formation energy results indicate that the excess Ni constituent preferentially occupies the Fe...

  • Investigating the effects of bulk supercooling and rapid solidification on Co-Ni-Ga ferromagnetic shape memory alloys. Kalaantari, Haamun; Amini, Shaahin; Hong, Jeongmin; Abbaschian, Reza // Journal of Materials Science;Oct2011, Vol. 46 Issue 19, p6224 

    In this study, Electromagnetic Levitation (EML) technique was utilized to explore the effect of bulk supercooling and rapid solidification in alloys with CoNiGa and CoNiGa (at.%) compositions. The effects of γ + β on the martensitic and austenitic transformation temperatures and magnetic...

  • Phase transitions in the ferromagnetic alloys Ni[sub 2+x]Mn[sub 1-x]Ga. Bozhko, A. D.; Vasil’ev, A. N.; Khovaılo, V. V.; Buchel’nikov, V. D.; Dikshteın, I. E.; Seletskiı, S. M.; Shavrov, V. G. // JETP Letters;2/10/98, Vol. 67 Issue 3, p227 

    The phase diagram of the cubic ferromagnetic shape-memory alloy Ni[sub 2+x]Mn[sub 1-x]Ga is constructed theoretically for the case when the Curie temperature is close to the structural transition temperature. This diagram agrees well with the experimental data obtained from resistance and...

  • Role of covalent hybridization in the martensitic structure and magnetic properties of shape-memory alloys: The case of Ni50Mn5+xGa35-xCu10. Li, G. J.; Liu, E. K.; Zhang, H. G.; Zhang, Y. J.; Xu, G. Z.; Luo, H. Z.; Zhang, H. W.; Wang, W. H.; Wu, G. H. // Applied Physics Letters;2/11/2013, Vol. 102 Issue 6, p062407 

    The influence of covalent hybridization on the martensitic structure and magnetic properties of Ni50Mn5+xGa35-xCu10 shape-memory alloys has been investigated. It is found that the lattice distortion (c - a)/a of L10 martensite linearly increases upon substitution of Mn for Ga, showing a change...

  • Characterization of phase transformations and shape memory behavior of Fe–27.79Mn–2.72Si (wt%) alloy by thermomechanical and thermal treatments. Eskil, Murat; Ceylan, Mehmet // Journal of Materials Science;Jul2009, Vol. 44 Issue 14, p3633 

    Magnetic properties and volume fraction of the phases of a Fe–27.79Mn–2.72Si (wt%) alloy have been investigated by Mössbauer spectroscopy. The microstructure has been investigated using transmission electron microscope, scattering electron microscope, and light optical...

  • Magnetocaloric properties of as-quenched NiMnIn ferromagnetic shape memory alloy ribbons. Sánchez Llamazares, J.; García, C.; Hernando, B.; Prida, V.; Baldomir, D.; Serantes, D.; González, J. // Applied Physics A: Materials Science & Processing;Jun2011, Vol. 103 Issue 4, p1125 

    The temperature dependences of magnetic entropy change and refrigerant capacity have been calculated for a maximum field change of Δ H=30 kOe in as-quenched ribbons of the ferromagnetic shape memory alloy NiMnIn around the structural reverse martensitic transformation and magnetic transition...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics