Open AccessThe effect of rapid quenching from melt on Martensitic transition and strain cha racteristics of Ni-Mn-Ga alloy
Author(s) -
李健靓,
赵韦人,
张羊换,
王新林,
张建福,
郭世海
Publication year - 2003
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.52.2849
Subject(s) - materials science , alloy , annealing (glass) , curie temperature , quenching (fluorescence) , diffraction , diffusionless transformation , melt spinning , martensite , strain (injury) , shape memory alloy , metallurgy , composite material , crystallography , microstructure , condensed matter physics , ferromagnetism , spinning , optics , chemistry , medicine , physics , fluorescence
Ni50Mn27Ga23/sub> alloy was prepared by melt_spinning at wheel velocities of 2,4 and 8m/s separately. The experimental results showed that the rapid quenching caused the decrease of the martensitic transformation temperature an d Curie temperature, while subsequent annealing would increase the depressed val ues. The NiMnGa specimens with a single_phase structure could be obtained more e asily in melt_spun ribbons than in cast alloys. Furthermore, x_ray diffraction s tudies revealed that the main diffraction peak drifted from (220) to (400) in me lt_spun ribbons, which made the texture form, and subsequent annealing made it d isappear. The effects of rapid quenching on the phase_transition strain and magn etic field_induced strain are very complicated. It was found that the phase tran sition strain and magnetic field_induced strain of melt_spun ribbons with textur e were larger than that of cast specimens.