Sm(CobalFe0.1Cu0.1Zr0.033)6.9高温永磁合金的矫顽力

王光建; 蒋成保

doi:10.7498/aps.61.187503

摘要

对Sm(CobalFe0.1Cu0.1Zr0.033)6.9合金, 经810℃等温时效后以0.5℃/min逐渐冷却, 在600℃-400℃温度区间淬火, 研究了不同淬火温度下的磁滞回线、磁畴和矫顽力温度系数β. 发现时效600℃淬火后磁滞回线出现台阶状, 说明畴壁中应存在两处钉扎. 随淬火温度的降低, 合金的室温矫顽力显著增加, 磁滞回线的台阶消失. 通过磁畴形貌发现时效600℃淬火后的磁畴接近条形畴, 1:5相中Cu分布相对均匀, 形成的畴壁钉扎较弱, 从而使磁滞回线出现台阶, 决定矫顽力的畴壁钉扎位于两相界面处; 随时效淬火温度的降低, 磁畴逐渐细化, 畴壁1:5相中的畴壁能降低, 形成了较强的内禀钉扎, 并决定材料的矫顽力, 两相界面处的畴壁钉扎被掩盖. 对不同温度淬火合金的高温矫顽力研究表明, 最强的畴壁钉扎位于两相界面处时, 矫顽力随温度升高逐渐增加, 矫顽力出现温度反常现象; 最强的畴壁钉扎位于1:5相中心时, 矫顽力随温度升高逐渐衰减. 当测试温度达到500℃后不同淬火温度样品的矫顽力几乎相同, 此时最强畴壁钉扎均在两相界面处.

关键词:

Abstract

The hysteresis behaviors domain structures and temperature coefficients of coercivity are investigated in Sm(CobalFe0.1 Cu0.1Zr0.033)6.9, which is aged at 810℃ and slowly cooled with a rate of 0.5℃/min, and then quenched at different temperatures. It is found that the demagnetization cures show two steps clearly as the alloys are quenched at 600℃, which means that there should have two pinnings on the domain wall, and its domain structure appears more as a zigzag shape domain, which means that there should be a small gradient of Cu distribution in the 1:5 cell boundary phase and a small domain wall pinning in the cell boundary phase. The maximum domain wall pinning should be at the interface between the 1:5 cell boundary phase and 2:17 cell phase. As the alloys are quenched at a lower temperature, the steps in the demagnetization cures disappear. At the same time, their domain structures become narrower, and show more attached domains, which means that a lower domain wall energy is in the 1:5 cell boundary phase and that the maximum domain wall pinning should be in the center of the 1:5 cell boundary phase. As the maximum domain wall pinning is at the interface between the 1:5 cell boundary phase and 2:17 cell phase, the coercivity will show an abnormal temperature dependence. While as the maximum domain wall pinning is in the center of the 1:5 cell boundary phase, the coercivity will decrease with temperature increasing. As the testing temperature rises to 500℃, the coercivities for all samples nearly come to the same values, and the maximum domain wall pinnings all should come to the interface between the 1:5 cell boundary phase and 2:17 cell phase.

Keywords:

2:17 type SmCo high temperature magnets /
hysteresis loop /
domain structure /
temperature coefficient of coercivity

作者及机构信息

王光建^1,2,
蒋成保¹

1.
北京航空航天大学材料科学与工程学院, 空天先进材料与服役教育部重点实验室, 北京 100191;

2.
河北工程大学理学院, 邯郸 056038

基金项目: 国家自然科学基金(批准号: 51071010)和中央高校基本科研业务费资助的课题.

Authors and contacts

1.
Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191, China;

2.
School of Science, Hebei University of Engineering, Handan 056038, China

Funds: Project supported the National Natural Science Foundation of China (Grant No. 51071010), and the Fundamental Research Funds for the Central Universities, China.

参考文献

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施引文献

[1]	Liu J F, Chui T, Dimitrov D, Hadjipanayis G C 1998 Appl. Phys. Lett. 73 3007
[2]	Streibl B, Fidler J, Schrefl T 2000 J. Appl. Phys. 87 4765
[3]	Gopalan R, Ohkubo T, Hono K 2006 Scri. Mater. 54 1345
[4]	Romero S A, de Campos M F, Rechenberg H R, Missell F P 2008 J. Magn. Magn. Mater. 320 e73
[5]	Liu J F, Ding Y, Zhang Y, Dimitar D, Zhang F, Hadjipanayis G C 1999 J. Appl. Phys. 85 5660
[6]	Rong C B, Zhang H W, Chen R J, Shen B G, He S L, Liu J P 2006 J. Phys. D: Appl. Phys. 39 437
[7]	Huang M Q, Turgut Z, Ma B M, Chen Z M, Lee D, Higgins A, Chen C H, Liu S, Chu S Y, Horwath J C, Fingers R T 2008 J. Appl. Phys. 103 07E134
[8]	Yan A, Gutfleisch O, Handstein A, Gemming T, Muller K H 2003 J. Appl. Phys. 93 7975
[9]	Gopalan R, Hono K, Yan A, Gutfleisch O 2009 Scri. Mater. 60 764
[10]	Xiong X Y, Ohkubo T, Koyama T, Ohashi K, Tawara K, Hono K 2004 Acta Mater. 52 737
[11]	Gutfleisch O, Müller K H, Khlopkov K, Wolf M, Yan A, Schäfer R, Gemming T, Schultz T 2006 Acta Mater. 54 997
[12]	Craik D J, Hill E 1974 Phys. Lett. 48 157
[13]	Liu J F, Hadjipanayis G C 1999 J. Magn. Magn. Mater. 195 620
[14]	Liu J F, Zhang Y, Dimitrov D, Hadjipanayis G C 1999 J. Appl. Phys. 85 2800
[15]	Liu S, Yang J, Doyle G, Potts G, Kuhl G 2000 J. Appl. Phys. 87 6728
[16]	Kronmüller H, Goll D 2002 Scri. Mater. 47 545

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