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The magnetic and microstructural evolution of Ni 45 Mn 24 Ga 23 Co 4 Cu 4 Heusler alloy ribbons
Author(s) -
Wei Jun,
Tang Yanmei,
Xu Lianqiang,
Tang Shaolong,
Du Youwei
Publication year - 2014
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.201431085
Subject(s) - materials science , alloy , annealing (glass) , austenite , melt spinning , martensite , diffusionless transformation , metallurgy , grain size , microstructure , crystallography , composite material , spinning , chemistry
Ni 45 Mn 24 Ga 23 Co 4 Cu 4 Heusler alloy ribbons were prepared using the melt‐spinning technique. The ribbons contain a mixed phase of austenite and martensite. The experimental results indicate that a synchronized change in the martensitic transformation and grain growth occur with increasing annealing temperatures. Moreover, the magnetic domain sizes at the wheel surface of the ribbons increased when the ribbons were annealed at temperatures >573 K, and the grain sizes did not change until the ribbons were annealed at 1173 K, which led to the false appearance of inconsistent magnetostructural and microstructural evolution occurred at the wheel surface. This finding might result from the hysteresis of grain growth behavior at the wheel surface compared with that inside the ribbons. Furthermore, the bending experiment results indicate that the Ni 45 Mn 24 Ga 23 Co 4 Cu 4 alloy ribbons exhibit good ductility, which means that melt‐spun NiMnGa alloy ribbons can exhibit good ductility when doped with Co and Cu.