Deciphering the glass-forming ability of Al_(2)O_(3)-Y_(2)O_(3)system from temperature susceptibility of melt structure  

作　　者：Pingsheng Lai Xuan Ge Caijuan Shi Jianqiang Li Fan Yang Wenquan Lu Jianguo Li Qiaodan Hu 

机构地区：[1]Shanghai Key Laboratory of Materials Laser Processing and Modification,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China [2]Department of Chemistry and Bioscience,Aalborg University,Aalborg 9220,Denmark [3]Beijing Synchrotron Radiation Facility,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [4]School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China [5]School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Journal of Materials Science & Technology》2024年第18期48-57,共10页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China-Key Program(No.52234010);National Natural Science Foundation of China(No.51971138);National Natural Science Foundation of China-Distinguished Young Scholars(No.52325407);National Key Basic Research Program of China(No.2020YFA0406101);the fund of the State Key Laboratory of Solidification Processing in NWPU(No.SKLSP202102).

摘　　要：Despite its significance in both fundamental science and industrial applications,the glass-forming transition in the Al_(2)O_(3)-Y_(2)O_(3)(AY)refractory system is not yet fully understood due to the elusive structure evolution upon cooling.Here,atomic-scale structural changes in AY-bearing melts with different compositions and temperatures are tracked by employing in situ high-energy synchrotron X-ray diffraction and empirical potential structure refinement simulation.We find that the glass-forming abilities(GFA)of AY-bearing melts are intriguingly correlated with the dependence of melt structure on temperature.In the case of the Al_(2)O_(3)and Y_(3)A_(l5)O_(12)(YAG),the observed large structural changes from superheating to under-cooling melt(i.e.,higher temperature susceptibility)correspond to a low GFA.Conversely,the 74Al_(2)O_(3)-26Y_(2)O_(3)(AY26)melt,with the smallest temperature susceptibility,exhibits the highest GFA.Simulation models illustrate that the temperature susceptibility of melt is associated with its atomic arrangement,especially the stability of cation-cation pairs.A balanced network(in AY26 melt),where the unsteady OAl3 tri-clusters are minimized and steady apex-to-apex connections between adjacent network units are abundant,contributes to stabilizing cationic interactions.This,in turn,fosters the formation of largesized Al-O-Al rings,which topologically facilitates the subsequent glass-forming transition.Our findings provide new structural insight into the GFA of AY-bearing melts and may expand to other unconventional glass-forming systems to accelerate glassy materials design.

关 键 词：Glass-forming ability Al_(2)O_(3)-Y_(2)O_(3)glasses Melt structure High-energy synchrotron X-ray diffraction Aerodynamic levitation EPSR simulation 

分 类 号：TQ170[化学工程—硅酸盐工业]