Collection of scientific works Nanosystems, nanomaterials, nanotechnologies Year 2024 Volume 22, Issue 4
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H. RAFAI, B. SMILI, E. SAKHER, M. SAKMECHE, A. BENSELHOUB, R. TIGRINE, R. PESCI, M. BOUOUDINA, and S. BELLUCCI

Structural and Magnetic Properties of Nanostructured Ni80Co17Mo3 Alloy Powder
803–822 (2024)

PACS numbers: 68.37.Hk, 75.50.Tt, 75.60.Ej, 81.07.Wx, 81.20.Ev, 81.20.Wk, 81.40.Rs

Mechanical alloying (MA) with a high-energy planetary ball mill is used to create nanostructured Ni80Co17Mo3-alloy samples from pure elemental powders. The powders obtained are analysed using x-ray diffraction, scanning electron microscopy, and vibrating-sample magnetometry techniques to investigate the microstructure, morphology, particle-sizes’ distribution, and magnetic properties as functions of milling time. The results show that x-ray diffraction analysis suggests the formation of nanostructured f.c.c. solid solutions, f.c.c.-NiCo(Mo), which become the dominant phase after 6 h of MA, with decreasing crystallite sizes ranging from 15.1 nm to 9.78 nm and increasing microstrain (0.41–0.66%) with increasing milling time to 72 h. Morphological observations utilizing scanning electron microscopy validate the production of nanocomposite and reveal a progressive refinement in particle size with milling time and a narrow particle-sizes’ distribution with an irregular shape for longer milling. The milling process induces significant changes in the magnetic properties, where the magnetism of the combination is lost due to the combined effects of crystallite-size reduction. After milling, the remanence ratio Mr/Ms (??4.1·10?3) and coercive field (??10.87 Oe) are found to be declining. The findings indicate that the alloy has reached its maximum level of magnetization and displays a very weak magnetic response

KEY WORDS: nanomaterials, mechanical alloying, particles’ morphology and size, x-ray diffraction, magnetic properties

DOI:  https://doi.org/10.15407/nnn.22.04.803

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