TY - JOUR

T1 - Structure and magnetic properties of Alnico8 alloy thermo-magnetically treated under a 10 T magnetic field

AU - Sun, X. Y.

AU - Chen, C. L.

AU - Ma, M. Y.

AU - Yang, L.

AU - Lv, L. X.

AU - Atroshenko, S.

AU - Shao, W. Z.

AU - Zhen, L.

N1 - Funding Information: This work was financially supported by National Key R&D Program of China (No. 2018YFB2003900 ), and National Natural Science Foundation of China (No. 50901024 ), International/Regional Cooperation and Exchange Program of NSFC (NSFC-RFBR, No. 51211120186 ), and National Basic Research Program of China ( 2012CB934102 ). X.Y. Sun was supported by Lab Foundation of National Key Laboratory for Precision Hot Processing of Metals. We wish to thank G. Q. Chen at Dalian University of Technology for his kind permission to use thermo-magnetic treatment equipment. M.L. Liu at Jilin University is acknowledged for her help and useful discussion on Mössbauer analysis. Publisher Copyright: © 2020 Elsevier Ltd Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/4

Y1 - 2020/4

N2 - The structure and compositions of spinodal phases in Alnico8 alloy isothermally treated at 830 °C under external magnetic field (Hext) up to 10 T were investigated by transmission electron microscopy (TEM). Under ultra-high magnetic field (10 T), the spinodal structure of Alnico8 alloy presents interesting diversity for the shapes of α1 phase particles, namely, Π-shape, H-shape and Ш-shape apart from regular rod-shape. Composition analysis shows that the Fe was mainly distributed in the α1 phase. The Co content in the α1 phase was lower than that in the α2 phase as evidenced by the point analysis results, and Co content inα1 phase of the alloy treated without magnetic field was higher than that of the alloy treated with a magnetic field. In contrast, the Ni, Al, Cu and Ti were concentrated in the α2 phase. The average hyperfine field of the alloy treated without magnetic field was about 301.3 kOe. While the alloy treated under magnetic field, it was slightly decreased, which was about 292.0 and 296.1 kOe under 0.7 and 10 T, respectively. Magnetic properties of the alloy treated under a 10 T magnetic field were the best, which were about 1.09T, 396Oe and 9.5 kJ/m3 for Br, Hc and (BH)max respectively. Especially for the coercivity, which was mainly contributed by the anisotropy of the α1 phase induced by the high magnetic field.

AB - The structure and compositions of spinodal phases in Alnico8 alloy isothermally treated at 830 °C under external magnetic field (Hext) up to 10 T were investigated by transmission electron microscopy (TEM). Under ultra-high magnetic field (10 T), the spinodal structure of Alnico8 alloy presents interesting diversity for the shapes of α1 phase particles, namely, Π-shape, H-shape and Ш-shape apart from regular rod-shape. Composition analysis shows that the Fe was mainly distributed in the α1 phase. The Co content in the α1 phase was lower than that in the α2 phase as evidenced by the point analysis results, and Co content inα1 phase of the alloy treated without magnetic field was higher than that of the alloy treated with a magnetic field. In contrast, the Ni, Al, Cu and Ti were concentrated in the α2 phase. The average hyperfine field of the alloy treated without magnetic field was about 301.3 kOe. While the alloy treated under magnetic field, it was slightly decreased, which was about 292.0 and 296.1 kOe under 0.7 and 10 T, respectively. Magnetic properties of the alloy treated under a 10 T magnetic field were the best, which were about 1.09T, 396Oe and 9.5 kJ/m3 for Br, Hc and (BH)max respectively. Especially for the coercivity, which was mainly contributed by the anisotropy of the α1 phase induced by the high magnetic field.

KW - Alnico8 alloy

KW - High magnetic field

KW - Magnetic properties

KW - Structure

KW - PHASE

KW - EVOLUTION

KW - ALLOYS

KW - ALNICO MAGNETS

KW - MICROSTRUCTURE

UR - http://www.scopus.com/inward/record.url?scp=85078167201&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/acb95df2-92d6-34e5-8385-c4bc02122288/

U2 - 10.1016/j.intermet.2019.106691

DO - 10.1016/j.intermet.2019.106691

M3 - Article

AN - SCOPUS:85078167201

VL - 119

JO - Intermetallics

JF - Intermetallics

SN - 0966-9795

M1 - 106691

ER -