Effect of niobium addition on the martensitic transformation and magnetocaloric effect in low hysteresis NiCoMnSn magnetic shape memory alloys | Zendy

Barış Emre | Zendy; Nickolaus M. Bruno | Zendy; S. Yüce | Zendy; İbrahim Karaman | Zendy

Open Access

Effect of niobium addition on the martensitic transformation and magnetocaloric effect in low hysteresis NiCoMnSn magnetic shape memory alloys

Author(s) -

Barış Emre,

Nickolaus M. Bruno,

S. Yüce,

İbrahim Karaman

Publication year - 2014

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4903494

Subject(s) - magnetic refrigeration , materials science , diffusionless transformation , magnetic shape memory alloy , austenite , magnetic hysteresis , condensed matter physics , shape memory alloy , magnetization , curie temperature , hysteresis , thermodynamics , differential scanning calorimetry , metallurgy , magnetic field , ferromagnetism , magnetic domain , microstructure , physics , quantum mechanics

The effect of Nb substitution for Ni in Ni45Co5Mn40Sn10 magnetic shape memory alloys on their magnetic properties, martensitic transformation characteristics, transformation hysteresis, and magnetocaloric properties was studied using wavelength-dispersive X-ray spectroscopy, differential scanning calorimetry, and the temperature and field dependence of the magnetization. Ni45Co5Mn40Sn10 alloy has a very low transformation hysteresis; however, the martensitic transformation temperatures are notably above room temperature, which is not desirable for magnetic refrigeration applications. In this study, small quantities of Nb substitution were shown to drastically shift the transformation temperatures to lower temperatures, at a rate of 68 K/at. % Nb, which is needed for household refrigeration. The austenite Curie temperature also decreased with increasing Nb content. However, a decrease in the latent heat of the martensitic transition was observed, which negatively affects the magnetic field-induced adiabati...

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