用真空电弧炉熔炼了LaFe10.8-xNbxCo0.7-Si1.5C0.2 (x =0、0.01、0.07、0.10、0.14、0.36和0.74)合金,并对其铸态及退火态的显微组织、相成分及体积分数进行研究.结果表明,Nb的添加可细化铸态组织中的树枝晶,并促进退火过程中1∶13相的形成.其中当x=0.07时,铸态组织的细化作用最为明显,退火后可得到接近单一的1∶13相.差示扫描量热分析的结果表明,LaFe10.8-xNbxCo0.7Si1.5C0.2(x=0、0.01、0.07、0.10、0.14和0.36)合金在相变点附近发生了二级磁相变,且相变温度随Nb含量的增加呈先升后降的趋势.
参考文献
| [1] | K. A. Gschneidner Jr.;V. K. Pecharsky .Thirty years of near room temperature magnetic cooling: Where we are today and future prospects[J].International Journal of Refrigeration,2008(6):945-961. |
| [2] | Balli M;Frchart D;Sari O et al.Direct measurement of the magnetocaloric effect on La (Fe13-x-yCoy) Six compounds near room temperature[J].Journal of Applied Physics,2009,106:023902-1-023902-5. |
| [3] | S. Fujieda;A. Fujita;K. Fukamichi .Large magnetocaloric effect in La(Fe_(x)Si_(1-x))_(13) itinerant-electron metamagnetic compounds[J].Applied physics letters,2002(7):1276-1278. |
| [4] | Hu F X;Qian X L;Sun J R et al.Magnetic entropy change and its temperature variation in compounds La (Fe1-xCox)11.2Si1.8[J].Journal of Applied Physics,2003,92(07):3620-3623. |
| [5] | Lyubina, J;Gutfleisch, O;Kuz'min, MD;Richter, M .La(Fe,Si)(13)-based magnetic refrigerants obtained by novel processing routes[J].Journal of Magnetism and Magnetic Materials,2008(18):2252-2258. |
| [6] | 张铁邦,陈云贵,唐永柏,涂铭旌.室温磁致冷材料的研究现状及发展趋势[J].功能材料,2007(08):1221-1224,1228. |
| [7] | 肖素芬,陈云贵,涂铭旌.热处理时间对La（Fe0.92Co0.08）11.9Si1.1化合物组织的影响[J].磁性材料及器件,2004(02):25-27. |
| [8] | Satoshi Hirosawa;Hiroyuki Tomizawa;Katsunori Bekki .Rapidly Solidified La(Fe_(1-x)Si_(x))_(13) Alloys and Their Magnetocaloric Properties[J].IEEE Transactions on Magnetics,2006(10):3608-3610. |
| [9] | Liu XB;Altounian Z;Tu GH .The structure and large magnetocaloric effect in rapidly quenched LaFe11.4Si1.6 compound[J].Journal of Physics. Condensed Matter,2004(45):8043-8051. |
| [10] | Xiang Chen;Yungui Chen;Yongbo Tang .High-temperature phase transition and magnetic property of LaFe_(11.6)Si_(1.4) compound[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2011(34):8534-8541. |
| [11] | Mithun Palit;J. Arout Chelvane;Himalay Basumatary .The effect of Nb and Zr addition on the microstructural features and magnetic properties of Tb_(0.3)Dy_(0.7)Fe_(1.95)[J].Scripta materialia,2009(1):56-59. |
| [12] | Pandian S.;Chandrasekaran V.;Markandeyulu G.;Iyer KJL.;Rao KVSR. .Effect of Al, Cu, Ga, and Nb additions on the magnetic properties and microstructural features of sintered NdFeB[J].Journal of Applied Physics,2002(10):6082-6086. |
| [13] | K. Prabahar;D.M. Raj Kumar;M. Manivel Raja;Mithun Palit;V. Chandrasekaran .Solidification behaviour and microstructural correlations in magnetocaloric Gd-Si-Ge-Nb alloys[J].Materials Science & Engineering, B. Solid-State Materials for Advanced Technology,2010(3):294-299. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%