Abstract
The effects of rare earth Dy addition on microstructure and martensitic transformation of polycrystalline Ni 50Mn 29Ga 21− x Dy x (numbers indicate at.%) shape memory alloys were investigated by means of scanning electron microscopy, energy dispersive X-ray spectroscopy, differential scanning calorimetry and X-ray diffraction. The results show that the microstructure of Ni–Mn–Ga–Dy alloys consists of the matrix and Dy-rich phase. Small amounts of the Dy-rich phase with 0.1 at.% Dy disperse homogeneously in the matrix. With the increase of the Dy content, the Dy-rich phase becomes larger and trends to distribute along the grain boundaries. The one-step martensitic transformation is observed in Ni 50Mn 29Ga 21− x Dy x alloys. With increasing Dy content, the martensitic transformation temperatures of Ni 50Mn 29Ga 21− x Dy x alloys increase remarkably, whereas the martensite structure of the Dy-containing alloys appears to be unchanged exhibiting seven-layered martensite structures at room temperature.
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