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

Published online by Cambridge University Press:  17 July 2014

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.
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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.

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Copyright © Materials Research Society 2014 

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