Correlation Between Superheated Liquid Fragility And Onset Temperature Of Crystallization For Al-Based Amorphous Alloys

Archives of Metallurgy and Materials

E.Y. Yoon¹  J. Guo²  H.S. Kim²  T. Feng³  J. Liu³  X. Hu³ 

[1] KOREA INSTITUTE OF MATERIALS SCIENCE (KIMS), CHANGWON, KOREA;POHANG UNIVERSITY OF SCIENCE AND TECHNOLOGY (POSTECH), CENTER FOR ADVANCED AEROSPACE MATERIALS, POHANG, KOREA;SHANDONG PROVINCIAL KEY LABORATORY OF HORTICULTURAL MACHINERIES AND EQUIPMENTS, TAIAN, CHINA

关键词: Keywords: Superheated liquid fragility;    Onset temperature of crystallization;    Thermal stability;   

DOI  :  10.1515/amm-2015-0169

学科分类：金属与冶金

来源: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica / University of Mining and Metallurgy

【 摘 要 】

Amorphous alloys or metallic glasses have attracted significant interest in the materials science and engineering communities due to their unique physical, mechanical, and chemical properties. The viscous flow of amorphous alloys exhibiting high strain rate sensitivity and homogeneous deformation is considered to be an important characteristic in thermoplastic forming processes performed within the supercooled liquid region because it allows superplastic-like deformation behavior. Here, the correlation between the superheated liquid fragility, and the onset temperature of crystallization for Al-based alloys, is investigated. The activation energy for viscous flow of the liquid is also investigated. There is a negative correlation between the parameter of superheated liquid fragility and the onset temperature of crystallization in the same Al-based alloy system. The activation energy decreases as the onset temperature of crystallization increases. This indicates that the stability of a superheated liquid can affect the thermal stability of the amorphous alloy. It also means that a liquid with a large superheated liquid fragility, when rapidly solidified, forms an amorphous alloy with a low thermal stability.

【 授权许可】

Unknown