Structure and phase transformation of melt-spun Gd5Si2Ge2

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	Structure and phase transformation of melt-spun Gd5Si2Ge2
	H. Fu ; X. T. Zu ; T. D. Shen
刊名	Thermochimica Acta
	2006
卷号	445 期号:1 页码:53-56
关键词	magnetocaloric materials Gd5Si2Ge2 alloy X-ray powder diffraction differential scanning calorimetry gd5si4-gd5ge4 transition system
ISSN号	0040-6031
中文摘要	Gd5Si2Ge2 materials were prepared by rapid solidification at different wheel speeds. The crystal phase and phase transformation of the rapidly solidified materials have been investigated by powder X-ray diffraction (XRD), differential scanning calorimetry (DSC), and transmission electron microscopy (TEM). The materials contained mainly a Gd5Si2Ge2-type single phase at a wheel speed of 20 m/s; a Gd5Si4-type major phase and a Gd5Si2Ge2-type minor phase at 30 m/s; a Gd5Si4-type single phase at 40 m/s; and Gd5Si4-type and Gd5Si2Ge2-type double phase at 50 m/s. A first-order phase transformation occurred at approximately 273 K in the materials prepared at a wheel speed of 20 m/s whereas a second-order phase transformation appeared at approximately 290 K in the materials prepared at other wheel speeds. Furthermore, we observed some exothermic peaks located at similar to 250-300 degrees C in the DSC curves for all the melt-spun samples. These exothermic reactions can be attributed to the crystallization of a small amount of glassy phase. The presence of glassy phase has been confirmed by both the electron diffraction pattern observed in the TEM observation and the glass transition found in the DSC scan. (c) 2006 Published by Elsevier B.V.
原文出处	://WOS:000238518900010
公开日期	2012-04-13
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/34202]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	H. Fu,X. T. Zu,T. D. Shen. Structure and phase transformation of melt-spun Gd5Si2Ge2[J]. Thermochimica Acta,2006,445(1):53-56.
APA	H. Fu,X. T. Zu,&T. D. Shen.(2006).Structure and phase transformation of melt-spun Gd5Si2Ge2.Thermochimica Acta,445(1),53-56.
MLA	H. Fu,et al."Structure and phase transformation of melt-spun Gd5Si2Ge2".Thermochimica Acta 445.1(2006):53-56.