TY - JOUR
T1 - A combined study on microstructure, microchemistry and magnetic behavior of (Sm0.12Co0.88)95Hf1B4 nano-composite ribbons by electron microscopy and atom probe tomography
AU - Raja, A.
AU - Al-Omari, I. A.
AU - Shield, J. E.
AU - Aich, S.
N1 - Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/12/5
Y1 - 2023/12/5
N2 - In this work, Hf and B modified ribbon produced by RSP (rapid solidification process) method have been studied to investigate the microstructure, phase formation and magnetic properties of the Sm-Co-based alloy. (Sm0.12Co0.88)95Hf1B4 ribbon has been synthesized and annealed at various temperatures (700 °C, 800 °C & 900 °C) to analyze the effect of temperature on magnetic properties and structure. X-ray diffraction (XRD) phase analysis has confirmed the 1:7 H phase as a significant phase in the as-spun ribbon. A combination of 1:5 H and 2:17 R phases were found in the ribbon annealed at 900 °C due to disorder-order transformation upon heat treatment. The development of ordered structure and grain growth upon annealing at 800 °C and 900 °C have deteriorated the magnetic properties. Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM) analysis also revealed the grain growth and the development of the ordered 2:17 R structure upon annealing. The ribbon annealed at 700 °C showed better magnetic properties, Hc≈ 8.6 kOe, Mr ≈ 49 emu/g and (BH)max≈ 5.63 MGOe with an average grain size of ∼149 ± 5 nm. TC of the as-spun ribbon was found to be ⁓750 °C, and the temperature co-efficient of magnetization (α) and coercivity (β) were about − 0.008 and − 0.161%/°C, respectively. The APT analysis confirmed the fine borides in both as-spun and annealed (700 °C & 900 °C) ribbons.
AB - In this work, Hf and B modified ribbon produced by RSP (rapid solidification process) method have been studied to investigate the microstructure, phase formation and magnetic properties of the Sm-Co-based alloy. (Sm0.12Co0.88)95Hf1B4 ribbon has been synthesized and annealed at various temperatures (700 °C, 800 °C & 900 °C) to analyze the effect of temperature on magnetic properties and structure. X-ray diffraction (XRD) phase analysis has confirmed the 1:7 H phase as a significant phase in the as-spun ribbon. A combination of 1:5 H and 2:17 R phases were found in the ribbon annealed at 900 °C due to disorder-order transformation upon heat treatment. The development of ordered structure and grain growth upon annealing at 800 °C and 900 °C have deteriorated the magnetic properties. Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM) analysis also revealed the grain growth and the development of the ordered 2:17 R structure upon annealing. The ribbon annealed at 700 °C showed better magnetic properties, Hc≈ 8.6 kOe, Mr ≈ 49 emu/g and (BH)max≈ 5.63 MGOe with an average grain size of ∼149 ± 5 nm. TC of the as-spun ribbon was found to be ⁓750 °C, and the temperature co-efficient of magnetization (α) and coercivity (β) were about − 0.008 and − 0.161%/°C, respectively. The APT analysis confirmed the fine borides in both as-spun and annealed (700 °C & 900 °C) ribbons.
KW - Microchemistry
KW - Microstructure
KW - Permanent magnets
KW - Sm-Co-based ribbons
KW - Tomography and Magnetic properties
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UR - https://www.mendeley.com/catalogue/22075aad-fc05-3721-9327-d4764d146a15/
U2 - 10.1016/j.jallcom.2023.171525
DO - 10.1016/j.jallcom.2023.171525
M3 - Article
AN - SCOPUS:85166576018
SN - 0925-8388
VL - 966
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
M1 - 171525
ER -