Effect of the Addition of Large Atomic Size Elements on the Glass Formation of Al-Ca-Ni Amorphous Alloys

2018 5th International Conference on Advanced Composite Materials and Manufacturing Engineering

Chen, Zipan^1 ; Xu, Xiangqi^1 ; Zhang, Huixian^2 ; Chen, Shoudong^1 ; Su, Jian^1

School of Mechanical Engineering, Tongling University, 1335 Cuihu four Road, Tongling

244061, China^1

China NCS Testing Technology Co., Ltd., Beijing

10008, China^2

关键词: Critical thickness;    Crystalline phase;    Crystallization resistance;    Crystallization temperature;    Glass formation;    Glass-forming ability;    Liquid stability;    Low melting point;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/394/3/032010/pdf
DOI  :  10.1088/1757-899X/394/3/032010

来源: IOP

【 摘 要 】

Effects of different large atomic radius elements (i.e., Na, Eu and Sr) on the glass forming ability (GFA) of Al-Ca-Ni alloy system were systematically investigated. The three doping elements are similar to each other, such as large atomic radius, low melting point and low Pauling's electronegativity. Our results confirmed that addition of 1 at.% Eu and Sr can enhance the crystallization resistance and stabilize the liquid stability, leading to the increment of the GFA. On the contrary, although the addition of Na to the base alloy could lowers the crystallization temperature, but effectively suppresses the competing α-Al crystalline phase and enhance the GFA. Moreover, with the increase of atomic radius of doping elements, the critical thickness for glass formation is gradually increased from 290 to 410μm. Therefore, it seemed that their atomic size played a more important role in improving the GFA of Al-Ca-Ni alloy.