Magnetic and Microstructural Properties of Nanostructured/Amorphous NiTi Prepared by Mechanical Alloying
Journal of Superconductivity and Novel Magnetism(2024)
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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