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Enhancement of the martensitic transformation and magnetocaloric effect of Ni–Mn–V–Sn ribbons by annealing treatment
Author(s) -
Xuan H. C.,
Zhang Y. Q.,
Li H.,
Han P. D.,
Wang D. H.,
Du Y. W.
Publication year - 2015
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201532024
Subject(s) - magnetic refrigeration , materials science , equiaxed crystals , annealing (glass) , curie temperature , diffusionless transformation , austenite , microstructure , melt spinning , grain size , condensed matter physics , martensite , lattice constant , metallurgy , magnetic field , magnetization , composite material , ferromagnetism , spinning , diffraction , physics , quantum mechanics , optics
The rapidly solidified Ni 41.98 Mn 42.97 V 2.08 Sn 12.97 ribbons are prepared by the melt‐spinning technique. The microstructure, martensitic transformation (MT), and magnetocaloric effect of the ribbons are greatly affected by annealing treatment. The equiaxed crystallized grains with the relatively homogeneous size distribution are observed for these ribbons. After annealing, the grain size becomes obviously large, the lattice constants decreases, and the exchange bias effect gets improved. The MT temperatures increase obviously for the annealed ribbons. Large magnetic entropy change (Δ S ) is obtained in the annealed Ni–Mn–V–Sn ribbons. The peak values of Δ S in the annealed ribbons are 41.6 and −2.3 J kg −1 K −1 in the vicinity of MT temperature and Curie temperature of austenite, respectively, for the field change of 30 kOe.