Effects of Minor Mn Replace of Al on Martensitic and Magnetic Transition in the Co38Ni34Al28-xMnx Alloys
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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.
KeywordsFerromagnetic shape memory alloys Martensitic Magnetic transition Magnetic susceptibility
This work is supported by the Specialized Research Fund for the Doctoral Program of Higher Education (No. 20124420110007), the Demonstration Dase Fund for Joint Training Graduate of Guangdong Province (No. 2013JDXM27), the National Natural Science Foundation of China (No. 51201038), and the National Natural Science Foundation of Guangdong (No. 2015A030313488).
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