Effect of thermal treatments in Ni-Fe-Ga with Co substitutions and Ni-Mn-Ga melt spun ribbons
نویسندگان
چکیده
منابع مشابه
Phonon softening in Ni-Mn-Ga alloys
The TA2 phonon dispersion curves of Ni-Mn-Ga alloys with different compositions which transform to different martensitic structures have been measured over a broad temperature range covering both paramagnetic and ferromagnetic phases. The branches show an anomaly (dip) at a wave number that depends on the particular martensitic structure, and there is softening of these anomalous phonons with d...
متن کاملA Mössbauer spectroscopy and neutron diffraction study of magnetostrictive, melt-spun Fe-Ga alloy ribbons
Ribbons of Fe100−xGax (x = 15, 17.5, 19.5 and 22.5) were prepared by rapid solidification from the melt. Fe Mössbauer spectroscopy and high resolution neutron diffraction have revealed that Fe100xGax alloys with x = 15 and 17.5 have the disordered bcc (A2) structure even after annealing, but the alloy with x = 19.5 developed the short-range ordered D03 phase when annealed. The x = 22.5 alloys s...
متن کاملGradient Distribution of Martensite Phase in Melt-Spun Ribbons of a Fe-Ni-Ti-Al Alloy
Metallographic, X-ray diffraction and magnetometric analysis were used to study the regularities of martensitic transformation in melt-spun ribbons of a Fe - 28 wt. % Ni - 2.1 wt. % Ti - 2 wt. % Al - 0.05 wt. % C alloy. The substantial differences in volume fractions of the martensite phase in local regions of thin melt-spun ribbons of the alloy are related to the size effect of the transformat...
متن کاملRole of Shuffles and Atomic Disorder in Ni-mn-ga
We report results of ab-initio calculations of the ferromagnetic Heusler alloy Ni-Mn-Ga. Particular emphasis is placed on the stability of the low temperature tetragonal structure with c/a = 0.94. This structure cannot be derived from the parent L21 structure by a simple homogeneous strain associated with the soft elastic constant C ′. In order to stabilise the tetragonal phase, one has to take...
متن کاملAnalytical and experimental issues in Ni-Mn-Ga transducers
Ferromagnetic shape memory martensites in the Ni-Mn-Ga system have been demonstrated to achieve a number of the criteria required for next generation actuators including the production of large theoretical strains up to 6%. The large strain originates in the rotation of twin variants and associated twin boundary motion which occurs in response to magnetic fields. The magnetic activation holds p...
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ژورنال
عنوان ژورنال: Procedia Structural Integrity
سال: 2016
ISSN: 2452-3216
DOI: 10.1016/j.prostr.2016.06.187