Hostname: page-component-8448b6f56d-sxzjt Total loading time: 0 Render date: 2024-04-20T01:36:30.163Z Has data issue: false hasContentIssue false
  • English
  • Français

Formation of NaZn13-type phase in LaFe11.5Si1.5 alloy during solidification process

Published online by Cambridge University Press:  17 July 2014

Xueling HOU ,
Chunyu LIU ,
Yun Xue ,
Ning Han ,
Hui Xu ,
Chunwei Ma  and
M.H. Phan
Xueling HOU*
Affiliation:
Laboratory for Microstructures of Shanghai University, 99 Shangda Road, BaoShan District, Shanghai, 200444, China. School of Materials Science and Engineering, Shanghai University, 149 Yangchang Road, Zhabei District, Shanghai, 200072, China.
Chunyu LIU
Affiliation:
Laboratory for Microstructures of Shanghai University, 99 Shangda Road, BaoShan District, Shanghai, 200444, China. School of Materials Science and Engineering, Shanghai University, 149 Yangchang Road, Zhabei District, Shanghai, 200072, China.
Yun Xue
Affiliation:
Laboratory for Microstructures of Shanghai University, 99 Shangda Road, BaoShan District, Shanghai, 200444, China. School of Materials Science and Engineering, Shanghai University, 149 Yangchang Road, Zhabei District, Shanghai, 200072, China.
Ning Han
Affiliation:
School of Materials Science and Engineering,Shanghai University Of Engineering Science, 333 Longteng Road, Songjiang District, Shanghai, 201620, China.
Hui Xu
Affiliation:
Laboratory for Microstructures of Shanghai University, 99 Shangda Road, BaoShan District, Shanghai, 200444, China. School of Materials Science and Engineering, Shanghai University, 149 Yangchang Road, Zhabei District, Shanghai, 200072, China.
Chunwei Ma*
Affiliation:
School of Materials Science and Engineering,Shanghai University Of Engineering Science, 333 Longteng Road, Songjiang District, Shanghai, 201620, China.
M.H. Phan
Affiliation:
Department of Physics, University of South Florida, Tampa, FL 33620, USA.
*
*Email: xlhou@staff.shu.edu.cn
Get access

Abstract

Low-cost La(FexSi1-x)13 alloys exhibiting the large magnetocaloric effect (MCE) are one of the most promising magnetic refrigerant candidates for room temperature magnetic refrigeration. The NaZn13-type phase (hereinafter 1:13 phase) is believed to play a key role in the MCE of these alloys. While the formation of the 1:13 phase directly from the melt upon cooling was challenging, in this paper we demonstrate that the 1:13 phase can be formed directly during solidification. We found that three kinds of solidification microstructure were formed because a competitive nucleation occurred between the 1:13 and α-(Fe,Si) phase during the solidification of LaFe11.5Si1.5 alloy. In case of a high cooling speed, a large amount of NaZn13–type phase with equiaxed grains and a small amount of α-(Fe,Si) phase were formed because of a dominant nucleation rate of 1:13 phase. When the cooling rate was small, a large number of α-(Fe,Si) phase with dendrites were formed because the nucleation rate of α-(Fe,Si) phase is larger than that of the 1:13 phase. These results revealed that nucleation rates of phases is very important to the composition formation and microstructure of LaFe11.5Si1.5 alloys.

Keywords

La-Fe-SiNaZn13-type phaseMicrostructurenucleation rateSolidification
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1708: Symposium VV – Magnetic Nanomaterials and Nanostructures , 2014 , mrss14-1708-vv04-23
Copyright
Copyright © Materials Research Society 2014 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Pecharsky, V.K., Gschneidner, K.A. Jr., Appl. Phys. Lett. 1997, 70: 3299.CrossRefGoogle Scholar
Tegus, O., Brück, E., Buschow, K.H, de Boer, F.R., Nature. 2002, 415(10): 150.CrossRefGoogle Scholar
Tiebang, ZHANG, Yungui, CHEN, Yongbai, TANG, Mingjing, TU, J.Functional Materials. 2007, 8(38): 1221.Google Scholar
Wada, H., Tanabe, Y., Appl.Phys.Lett. 2001, 79(20): 3302F.CrossRefGoogle Scholar
Hu, X., Sun, J.R., Cheng, Z.H., G.H.Rao, , Zhang, X.X., Appl.Phys.Lett. 2001, 78(23): 3675.CrossRefGoogle Scholar
Fujita, A., Fujieda, S., Hasegawa, Y., and Fukamichi, K., Phys. Rev .2003, B 67, 104416.CrossRefGoogle Scholar
Hu, ZHANG, Bo, BAO, Puji, SHI, Bin, FU et al. , J. Rare Earths .2008, 26(5): 727.CrossRefGoogle Scholar
liu, Xd., liu, x.b., altounian, z., tu, g.h.. Appl. Phys. A 82, 339–343 (2006).CrossRefGoogle Scholar
Hu, FX, Gao, J, Qian, X L, Sun, J R, Shen, BG. [J]. J.Appl. Phys, 2005, 97(10): 10M303.CrossRefGoogle Scholar
Liu, J, Krautz, M, Skokov, K, et al. , Acta Materialia. 2011, 59(9): 3602.CrossRefGoogle Scholar
Liu, X B, Liu, X D, Altounian, Z, et al. , J. Alloys Compd. 2005, 397(1): 120.CrossRefGoogle Scholar
Liu, X D, Liu, X B, Altounian, Z, et al. , Applied Physics A. 2006, 82(2): 339.CrossRefGoogle Scholar
Gutfleisch, O., Yan, A., and Müller, K.-H., J. Appl. Phys. 2005, 97, 10M305.CrossRefGoogle Scholar
Ding, M. Z., Liu, Z., Chen, R. J., and Yan, A. R., J. Appl. Phys. 2010, 107, 09A952.Google Scholar
Christian, JW. The theory of transformations in metals and alloys [M]. Oxford; Pergamon Press; 1981.Google Scholar
Spaepen, F. The temperature dependence of the crystal-melt interfacial tension: a simple model. Mater Sci Eng A [J] . 1994,178:15.CrossRefGoogle Scholar
Gong, Xuanming, Nucleation Kinetics of crystalline Phases in undercooled La-Fe-Si Melts [D].China, Northeastern University. 2008.Google Scholar