Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7900331 | Journal of Non-Crystalline Solids | 2018 | 6 Pages |
Abstract
Notable improvements in the glass-forming ability (GFA) of Zr-based metallic glasses with melt hydrogenation have been reported in our previous studies. The effects of hydrogen on GFA are usually explained via short-range structural order, local symmetry, structural free-volume, and bonding character. To fundamentally understand why hydrogen enhances GFA, thermal analyses were carried out on a Zr55Cu30Ni5Al10 amorphous alloy to assess how hydrogen affected viscosity, fragility, critical cooling rate, and Gibbs free energy difference, â G. Amorphous alloys subjected to melt hydrogenation were found to possess higher viscosity and lower fragility, indicating increased GFA. The critical cooling rate of hydrogenated alloy melts gradually decreased and the lowest critical cooling rate was 10 K/s when the alloy was fabricated in Ar + 10%H2. The liquid/solid â G of meltâhydrogenated alloy was significantly smaller than that of the equivalent nonâhydrogen alloy. From thermodynamic and dynamic perspectives, viscosity, fragility, critical cooling rate, and â G demonstrated that melt hydrogenation improved these alloys' GFA and explained the present experimentally observed improvements in GFA.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Fuyu Dong, Mengyuan He, Yue Zhang, Liangshun Luo, Yanqing Su, Binbin Wang, Hongjun Huang, Qingchun Xiang, Xiaoguang Yuan, Xiaojiao Zuo, Baoshuai Han, Yanjin Xu,