Abstract
The effect of rare earth element Nd addition on the microstructure and martensitic transformation behavior of Ni50Ti50−xNdx(x=0, 1, 3, 7, 20) shape memory alloy was investigated experimentally. The results showed that the microstructure of Ni-Ti-Nd ternary alloy consists of the NiNd phase and the NiTi matrix. One-step martensitic transformation was observed in all alloys. The martensitic transformation start temperatureMsincreased gradually with increasing Nd content for Ni-Ti-Nd alloys.
Highlights
Ni-Ti based shape memory alloys (SMAs) have unique shape memory effects and super-elasticity behavior and have been used in various fields, in engineering and medical applications [1]
The diffraction peaks are identified to be from NiTi B19 martensite phase, NiTi B2 austenite phase, NiTi2 phase, and NiNd alloy after comparing with JCPDF cards
The (111)M peak is observed to move toward the left for Ni50Ti50−xNdx(x = 1, 3, 7, 20) alloys; that is, the diffraction angle decreases with increasing Nd fraction, which indicates that the interplanar spacing of (111) of the martensite expands with Nd addition from 1 at.% to 20 at.%
Summary
Ni-Ti based shape memory alloys (SMAs) have unique shape memory effects and super-elasticity behavior and have been used in various fields, in engineering and medical applications [1]. The microstructure and martensitic transformation temperature of the rare earth (RE) of Ce [6], Gd [7], Dy [8], and La [9] in addition to Ni-Ti binary alloys have been studied using scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), X-ray diffraction (XRD), and differential scanning calorimetry (DSC). The addition of these REs to Ni-Ti binary alloys was found to increase the martensitic transformation temperature and change the phase transformation sequence
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