Skip to main content Accessibility help
×
Home

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

  • Xueling HOU (a1) (a2), Chunyu LIU (a1) (a2), Yun Xue (a1) (a2), Ning Han (a3), Hui Xu (a1) (a2), Chunwei Ma (a3) and M.H. Phan (a4)...

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.

Copyright

Corresponding author

References

Hide All
1. Pecharsky, V.K., Gschneidner, K.A. Jr., Appl. Phys. Lett. 1997, 70: 3299.
2. Tegus, O., Brück, E., Buschow, K.H, de Boer, F.R., Nature. 2002, 415(10): 150.
3. Tiebang, ZHANG, Yungui, CHEN, Yongbai, TANG, Mingjing, TU, J.Functional Materials. 2007, 8(38): 1221.
4. Wada, H., Tanabe, Y., Appl.Phys.Lett. 2001, 79(20): 3302F.
5. Hu, X., Sun, J.R., Cheng, Z.H., G.H.Rao, , Zhang, X.X., Appl.Phys.Lett. 2001, 78(23): 3675.
6. Fujita, A., Fujieda, S., Hasegawa, Y., and Fukamichi, K., Phys. Rev .2003, B 67, 104416.
7. Hu, ZHANG, Bo, BAO, Puji, SHI, Bin, FU et al. , J. Rare Earths .2008, 26(5): 727.
8. liu, Xd., liu, x.b., altounian, z., tu, g.h.. Appl. Phys. A 82, 339343 (2006).
9. Hu, FX, Gao, J, Qian, X L, Sun, J R, Shen, BG. [J]. J.Appl. Phys, 2005, 97(10): 10M303.
10. Liu, J, Krautz, M, Skokov, K, et al. , Acta Materialia. 2011, 59(9): 3602.
11. Liu, X B, Liu, X D, Altounian, Z, et al. , J. Alloys Compd. 2005, 397(1): 120.
12. Liu, X D, Liu, X B, Altounian, Z, et al. , Applied Physics A. 2006, 82(2): 339.
13. Gutfleisch, O., Yan, A., and Müller, K.-H., J. Appl. Phys. 2005, 97, 10M305.
14. Ding, M. Z., Liu, Z., Chen, R. J., and Yan, A. R., J. Appl. Phys. 2010, 107, 09A952.
15. Christian, JW. The theory of transformations in metals and alloys [M]. Oxford; Pergamon Press; 1981.
16. Spaepen, F. The temperature dependence of the crystal-melt interfacial tension: a simple model. Mater Sci Eng A [J] . 1994,178:15.
17. Gong, Xuanming, Nucleation Kinetics of crystalline Phases in undercooled La-Fe-Si Melts [D].China, Northeastern University. 2008.

Keywords

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed