Microstructure and devitrification behavior of melt-spun Al-rich metallic glasses and nanostructured composites

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	Microstructure and devitrification behavior of melt-spun Al-rich metallic glasses and nanostructured composites
	S. C. Tjong; J. Q. Wang
	2001
发表期刊	Zeitschrift Fur Metallkunde
ISSN	0044-3093
卷号	92 期号:6 页码:610-616
摘要	Melt-spun Al-rich metallic glasses and nanostructured composites were synthesized under various quenching rates. Differential scanning calorimetry (DSC), X-ray diffraction and transmission electron microscopic techniques were employed to study the microstructure and devitrification of these samples in more details. The microstructure obtained is strongly sensitive to the quenching rates used. A reduction of the quenching rate from 50 to 9 m/s changed the structure from an amorphous single phase to the coexistence of alpha -Al nanocrystals and amorphous phase, and finally to a combination of alpha -Al, Al-3(Ni,Fe), Al11Ce3 and amorphous matrix. Upon devitrifying, a two-stage crystallization reaction was observed but the glass transition was not detected in these samples. The absence of glass transition was presumably due to the formation of pre-existing nuclei. Isothermal and nonisothermal DSC measurements indicated that the first crystallization was associated with the growth of alpha -Al nanocrystals controlled by the volume diffusion with a small activation energy of 1.3-1.7eV. The second crystallization was derived from the growth of Al-3(Ni,Fe) and Al11Ce3 nanophases.
部门归属	city univ hong kong, dept phys & mat sci, kowloon, hong kong, peoples r china. chinese acad sci, inst met res, state key lab rapidly solidified nonequilibrium a, shenyang, peoples r china.;tjong, sc (reprint author), city univ hong kong, dept phys & mat sci, tat chee ave, kowloon, hong kong, peoples r china
关键词	Metallic Glasses Nanostructured Composites Microstructure Devitrification Behavior Amorphous-alloys Crystallization Kinetics Nanocrystal Development Atomic-structure Nucleation Fe Ni
URL	查看原文
WOS记录号	WOS:000170250900015
引用统计	被引频次：6[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/36819
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	S. C. Tjong,J. Q. Wang. Microstructure and devitrification behavior of melt-spun Al-rich metallic glasses and nanostructured composites[J]. Zeitschrift Fur Metallkunde,2001,92(6):610-616.
APA	S. C. Tjong,&J. Q. Wang.(2001).Microstructure and devitrification behavior of melt-spun Al-rich metallic glasses and nanostructured composites.Zeitschrift Fur Metallkunde,92(6),610-616.
MLA	S. C. Tjong,et al."Microstructure and devitrification behavior of melt-spun Al-rich metallic glasses and nanostructured composites".Zeitschrift Fur Metallkunde 92.6(2001):610-616.