Magnetic and Microstructural Properties of Nanostructured/Amorphous NiTi Prepared by Mechanical Alloying

Journal of Superconductivity and Novel Magnetism(2024)

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摘要
This study aims to examine the effects of milling time on the morphological, structural, and magnetic properties of nanostructured Ni50Ti50 powders prepared by high-energy mechanical alloying using a Fritsch Pulverisette 7 planetary ball mill. Scanning electron microscopy and electron dispersive X-ray spectroscopy, results revealed a novel particle folding phenomenon during high-energy milling, significantly diverging from conventional welding and fracture processes. With increasing milling time, it was observed reduced particle size, and enhanced spherical equiaxial morphology, alongside a mixture of the amorphous phase, NiTi-martensite (Ms), NiTi-austenite (As), and solid solution phases (SS). Rietveld refinements of X-ray diffraction patterns and magnetic measurements highlighted the critical role of the amorphous phase in determining the Ms and Mr values of synthesized Ni50Ti50 powders. After 72 h of milling, the coercive field increased to 285.8 Oe, and the martensitic phase proportion reached 21.58
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关键词
Mechanical alloying,Amorphization,Nanocrystallization,Rietveld refinement,NiTi alloys,Structural,Microstructural,Magnetic properties
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