Metallic glasses are expected to have quite tunable structures in their configuration space, without the strict constraints of a well-defined crystalline symmetry and large energy barriers separating different states in crystals. However, effectively modulating the structure of metallic glasses is rather difficult. Here, using complementary in situ synchrotron x-ray techniques, we reveal thermal-driven structural ordering in a Ce65Al10Co25metallic glass, and a reverse disordering process via a pressure-induced rejuvenation between two states with distinct structural order characteristics. Studies on other metallic glass samples with different compositions also show similar phenomena. Our findings demonstrate the feasibility of two-way structural tuning states in terms of their dramatic ordering and disordering far beyond the nearest-neighbor shells with the combination of temperature and pressure, extending accessible states of metallic glasses to unexplored configuration spaces.
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Abstract -
Liu, Ye ; Lou, Hongbo ; Zhang, Fei ; Liang, Tao ; Chen, Songyi ; Li, Shubin ; Zhang, Xin ; Tan, Lijie ; Prakapenka, Vitali B. ; Greenberg, Eran ; et al ( , Journal of Applied Physics)
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Zhang, Fei ; Lou, Hongbo ; Chen, Songyi ; Chen, Xiehang ; Zeng, Zhidan ; Yan, Jinyuan ; Zhao, Wuxin ; Wu, Yuan ; Lu, Zhaoping ; Zeng, Qiaoshi ( , Journal of Applied Physics)