Abstract
The Co–Ni–Al new ferromagnetic shape memory alloys (FSMAs) with Mn replacing of minor Al were casted by a cylindrical chilled copper way, then the origin ingots were cut into small specimens and annealed by a technology process of 1473 K × 12 h, followed by quenching into the ice water. The result shows that Mn addition plays a positive role in adjusting the microstructure of γ-phase, promoting the self-synergistic change of β-phase to γ-phase, increasing the magnetization saturation and the magneto-crystalline anisotropy constant (K). The best suitable Mn content approximately x = 1.5 is beneficial for adjusting both martensitic and magnetic transitions; further, the Co38Ni34Al26.5Mn1.5 alloy has the biggest χmax (magnetic susceptibility) value (0.46%) and the broadest magnetic transition scale (near the room temperature) with the biggest △T value reaches to 27 K, respectively. Therefore, the addition of Mn with a minor content is very effective in optimizing the Co–Ni–Al FSMAs for obtaining a good magnetic-field-induced strain, indicating a potential and prospect application.
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