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Sm2Co17型永磁合金大量使用在上海同步辐射光源储存环的永磁型波荡器上,在受到长期辐照后会发生磁性能损失的现象,进而影响同步辐射光的品质.为了探索其潜在的微观机理,本文首先对Sm2Co17型永磁合金所处混合辐射场的粒子及相关物理量进行了计算分析,确定引发磁性能损失的主要粒子是中子.然后采用Ar离子模拟中子辐照损伤的方法对其进行辐照,采用透射电镜对其辐照前后的微观形貌及微观结构进行了研究探讨,采用振动样品磁强计对永磁合金辐照前后的饱和磁化强度进行了分析对比,并讨论了微观结构演化与宏观磁性能变化的联系.结果表明,Ar离子辐照后Sm2Co17型永磁合金饱和磁化强度的不可逆损失与微观结构变化有直接的关系,其2:17相从单晶结构转变为非晶结构是造成其磁性能损失可能的微观机制.
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关键词:
- Sm2Co17型永磁合金 /
- 辐照效应 /
- 饱和磁化强度 /
- 微观结构
Insertion devices are crucial parts of the third generation of synchrotron radiation facility and free electron laser devices. The use of insertion device can improve the brightness and coherence of synchrotron radiation light. Undulator, one kind of insertion device, is largely installed in the storage ring of Shanghai synchrotron radiation facility. The main part of undulator is the device of magnetic source which consists of periodically arranged permanent magnets with the same magnetic field strength. In order to keep the normal electronic trajectory, a stable magnetic intensity in undulator is required. The Sm2Co17 type permanent magnets with high intrinsic coercive force and good radiation stability are largely installed in the facility. However, the losses for magnetic properties of Sm2Co17 type permanent magnets can be induced by longperiod irradiation in undulator through beam loss or mis-steering. The reduction of magnetic field could affect the electron energy, direction and the movement trajectory and so on, which seriously affects the amount of synchrotron radiation light. Microstructure of Sm2Co17 type permanent magnet affects the macro magnetic properties and there is not any available report on the microstructure investigation of Sm2Co17 type permanent magnet after being irradiated. Therefore, in this work, the effect of irradiation on the microstructure evolution is investigated. The radiation fields of Sm2Co17 type permanent magnets and the main particles (neutron) that result in losing magnetic properties are first analyzed and confirmed by Monte Carlo code FLUKA calculation. Then, Sm2Co17 type permanent magnet samples are irradiated by Ar ions at different fluences to simulate neutron irradiation damage. Meanwhile, the microstructure evolutions of irradiated samples are characterized by transmission electron microscopy. Moreover, high resolution transmission electron microscopic images are taken at the peak of radiation damage field to further investigate the radiation damage. In the respect of macro magnetic properties, hysteresis loops are measured by vibrating sample magnetometer in order to study the change of saturated magnetization. The results indicate that the decrease of saturated magnetization value is related to the change of microstructure, which proves the speculation of previous investigations. The evolution of 2:17 phase transformed from single crystals into amorphous structure is a possible microscopic mechanism for irreversible loss for saturated magnetization of Sm2Co17.-
Keywords:
- Sm2Co17 type permanent magnet /
- irradiation effect /
- saturated magnetization /
- microstructure
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[1] Cai G W, Jia Q K (in Chinese) [蔡根旺, 贾启卡 2005 强激光与粒子束 17 1585]
[2] He Y Z, Zhang J D, Zhou Q G, Qian Z M, Li Y (in Chinese) [何永周, 张继东, 周巧根, 钱珍梅, 黎阳 2010 强激光与粒子束 22 1627]
[3] He Y Z, Zhou Q G 2012 High Power Laser Part. Beams 24 2187 (in Chinese) [何永周, 周巧根 2012 强激光与粒子束 24 2187]
[4] Vaerenbergh P V, Chavanne J, Elleaume P 1999 Fifth Conference on Radiation and Its Effects on Components and Systems Fontevraud, France, September 13-17 1999 p246
[5] Petra M, Den Hartog P K, Moog E R, Sasaki S, Sereno N, Vasserman I B 2003 Nucl. Instr. Meth. Phys. Res. A 507 422
[6] Bizen T, Asano Y, Maréchal X M, Seike T, Aoki T, Fukami K, Hosoda N, Yonehara H, Takagi T, Hara T, Tanaka T, Kitamura H 2007 Nucl. Instr. Meth. Phys. Res. A 574 401
[7] Luna H B, Maruyama X K 1989 Nucl. Instr. Meth. Phys. Res. A 285 349
[8] Okuda S, Ohashi K, Kobayashi N 1994 Nucl. Instr. Meth. Phys. Res. B 94 227
[9] Bizen T, Tanaka T, Asano Y, Kim D E, Bak J S, Lee H S, Kitamura H 2001 Nucl. Instr. Meth. Phys. Res. A 467-468 185
[10] Bizen T, Asano Y, Hara T, Marechal X, Seike T, Tanaka T, Lee H S, Kim D E, Chung C W, Kitamura H 2003 Nucl. Instr. Meth. Phys. Res. A 515 850
[11] Qiu R, Lee H S, Hong S, Li J L, Bizen T 2007 Nucl. Instr. Meth. Phys. Res. A 575 305
[12] Qiu R, Lee H S, Li J L, Koo T Y, Jang T H 2008 Nucl. Instr. Meth. Phys. Res. A 594 111
[13] Alderman J, Job P K, Martin R C, Simmons C M, Owen G D 2002 Nucl. Instr. Meth. Phys. Res. A 481 9
[14] Kawakubo T, Nakamura E, Numajiri M 2004 Proceedings of the Ninth European Particle Accelerator Conference Lucerne, Switzerland, July 5-9, 2004 p1696
[15] Anderson S, Spencer J, Wolf Z, Gallagher G 2007 IEEE Particle Accelerator Conference Albuquerque, USA, June 25-29, 2007 p581
[16] Miyahara N, Honma T, Fujisawa T 2010 Nucl. Instr. Meth. Phys. Res. B 268 57
[17] Gao R S, Zhen L, Shao W Z, Hao X P 2008 J. Appl. Phys. 103 07E136
[18] Gao R S, Zhen L, Li G A, Xu C Y, Shao W Z 2006 J. Magn. Magn. Mater. 302 156
[19] Ito Y, Yasuda K, Ishigami R, Hatori S, Okada O, Ohashi K, Tanaka S 2001 Nucl. Instr. Meth. Phys. Res. B 183 323
[20] Ito Y, Yasuda K, Ishigami R, Sasase M, Hatori S, Ohashi K, Tanaka S, Yamamoto A 2002 Nucl. Instr. Meth. Phys. Res. B 191 530
[21] Ito Y, Yasuda K, Sasase M, Ishigami R, Hatori S, Ohashi K, Tanaka S 2003 Nucl. Instr. Meth. Phys. Res. B 209 362
[22] Ito Y, Yasuda K, Ishigami R, Ohashi K, Tanaka S 2006 Nucl. Instr. Meth. Phys. Res. B 245 176
[23] Kähkönen O P, Talvitie M, Kautto E, Manninen M 1994 Phys. Rev B 49 6052
[24] Cost J R, R D Brown, Giorgi A L, Stanley J T 1988 IEEE Trans. Magn. 24 2016
[25] Okuda S, Ohashi K, Kobayashi N 1994 Nucl. Instr. Meth. Phys. Res. B 94 227
[26] Klaffky R, Lindstrom R, Maranville B, Shull R, Micklich B J, Vacca J 2006 Proceedings of the Tenth European Particle Accelerator Conference Edinburgh, Scotland, June 26-30, 2006 p3589
[27] Kähkönen O P, Mäkinen S, Talvitie M, Rajainmäki H, Manninen M 1990 Euro. Phys. Lett. 12 413
[28] Asano Y, Bizen T, Marechal X 2009 J. Synchrotron Rad. A 16 317
[29] Böhlen T T, Cerutti F, Chin M P W, Fassò A, Ferrari A, Ortega P G, Mairani A, Sala P R, Smirnov G, Vlachoudis V 2014 Nucl. Dt. Sheets 120 211
[30] Battistoni G, Boehlen T, Cerutti F, Chin P W, Esposito L S, Fassò A, Ferrari A, Lechner A, Empl A, Mairani A, Mereghetti A 2015 Ann. Nucl. Energy 82 10
[31] Qiu R 2007 Ph. D. Dissertation (Beijing: Tsinghua University) (in Chinese) [邱睿 2007 博士学位论文(北京: 清华大学)]
[32] Qiu R, Li J L, Bi L, Li W Q, Zhou J J 2008 At. Energy Sci. Tech. 42(S1) 375 (in Chinese) [邱睿, 李君利, 毕垒, 李文茜, 周婧劼 2008 原子能科学技术 42(S1) 375]
[33] Abromeit C 1994 J. Nucl. Mater. 216 78
[34] Ziegler J F, Ziegler M D, Biersack J P 2010 Nucl. Instr. Meth. Phys. Res. B 268 1818
[35] Hashimoto N, Hunn J D, Byun T S, Mansur L K 2003 J. Nucl. Mater. 318 300
[36] Li J J, Huang H F, Lei G H, Huang Q, Liu R D, Li D H, Yan L 2014 J. Nucl. Mater. 454 173
[37] Tian J J, Yin H Q, Qu X H (in Chinese) [田建军, 尹海清, 曲选辉 2005 磁性材料及器件 36 12]
[38] Li L Y, Yi J H, Huang B Y, Peng Y D 2005 Acta Metall. Sin. 41 791 (in Chinese) [李丽娅, 易健宏, 黄伯云, 彭远东 2005 金属学报 41 791]
[39] Tu S J 2009 M. S. Dissertation (Hangzhou: Zhejiang University) (in Chinese) [涂少军 2009 硕士学位论文(杭州: 浙江大学)]
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