A new criterion for predicting the glass-forming ability of bulk metallic glasses

作者：Long, Zhilin^*; Wei, Hongqin; Ding, Yanhuan; Zhang, Ping; Xie, Guoqiang; Inoue, Akihisa

来源：Journal of Alloys and Compounds, 2009, 475(1-2): 207-219.

DOI：10.1016/j.jallcom.2008.07.087

• Amorphous materials
• Metals
• Casting
• Thermal analysis

Based on the consideration of both the resistance of amorphous phase against crystallization and the stability of under-cooled liquid against competing crystalline phase formation, a criterion omega, defined as T-g/T-x - 2T(g)/(T-g T-l) (T-g, T-x and T-l denote the glass transition temperature, the onset crystallization temperature and the liquidus temperature, respectively), has been proposed for evaluating the glass-forming ability (GFA) of bulk metallic glasses (BMGs). A survey of the readily available experimental data associated with the thermal analysis of various glass-forming alloys shows that the new criterion omega exhibits the best correlation with the maximum section thickness (D-max) as well as the critical cooling rate (R-c) for glass formation among other criteria proposed in recent years, such as T-rg(=T-g/T-l), Delta T-x(=T-x - T-g), gamma(=T-x/(T-g T-l)), gamma(m)(=(2T(x) - T-g)/T-l), Delta T-rg(=(T-x - T-g)/(T-l - T-g)), delta(=T-x/(T-l - T-g), phi(=T-rg(Delta T-x/T-g)(0.143), alpha(=T-x/T-l) beta(=(T-x/T-l beta(=(T-x/T-g T-g/T-l) and beta(=T-x x T-g/(T-l - T-x)(2)). Therefore, it can be anticipated that this new criterion will be used as a useful and efficient guideline for exploring new BMG formers.

• 出版日期2009-5-5
• 单位湘潭大学; 邵阳学院