Study on crystallization kinetics of binary alloys through model colloidal mixtures

JOURNAL OF ALLOYS AND COMPOUNDS

卷:504

Article; Proceedings Paper

Hu, Yanping¹  Lan, Ding¹  Dai, Guoliang¹  Jiang, Heng¹  Duan, Li¹  Wei, BingChen¹ 

[1] Chinese Acad Sci, Inst Mech, Key Lab Micrograv, Natl Micrograv Lab, Beijing 100190, Peoples R China

关键词: Glass-forming ability;    Metallic glass;    Colloid;    Crystallization;   

DOI  :  10.1016/j.jallcom.2010.02.151

来源: Elsevier

【 摘 要 】

Since the discovery of amorphous alloys, extensive attentions have been paid to understand the mechanism of glass-forming. The structural studies on its underlying mechanism have met challenge on direct structural characterization. It has been shown that the phase behavior of colloids dispersed in a solvent is thermodynamically equivalent to that of atoms and small molecules, however, colloids can be studied with optical microscopy due to their relatively large size. In this work, we use a binary colloidal model system with the particle size ratio comparable to atomic ratio of reported binary bulk metallic glasses to study the topological effect on crystallization and glass-forming ability of binary metallic alloys (Cu-Hf and Cu-Zr systems). The crystallization kinetics and structure of the colloid system were studied by real-time optical examination and light scattering technique. The results exhibit that there are two confined regions in the mixing ratio (composition) range in the colloid system with an enhanced glass-forming ability and retarded crystallization kinetics. The agreement between results of the model system and the experimental data on the binary bulk metallic glass formation suggests that purely topological factor plays an important role in determining the glass-forming ability. (C) 2010 Elsevier B.V. All rights reserved.

【 授权许可】

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