Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 22, Issue 37, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/22/37/375404
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Funding
- National Natural Science Foundation of China [50701038, 60776014, 60876002, 50871104, 50920105101, 10979002, 51050110136]
- Zhejiang Provincial Natural Science Foundation [Y4080324]
- Zhejiang University
- Ministry of Education of China
- Department of Science and Technology of Zhejiang Province
- Baoyugang foundation of Zhejiang University
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Using in situ high-pressure x-ray diffraction (XRD), we observed a pressure-induced polyamorphic transition from the low-density amorphous (LDA) state to the high-density amorphous (HDA) state in Ce75Al23Si2 metallic glass at about 2 GPa and 300 K. The thermal stabilities of both LDA and HDA metallic glasses were further investigated using in situ high-temperature and high-pressure XRD, which revealed different pressure dependences of the onset crystallization temperature (T-x) between them with a turning point at about 2 GPa. Compared with Ce75Al25 metallic glass, minor Si doping shifts the onset polyamorphic transition pressure from 1.5 to 2 GPa and obviously stabilizes both LDA and HDA metallic glasses with higher T-x and changes their slopes dT(x)/dP. The results obtained in this work reveal another polyamorphous metallic glass system by minor alloying (e.g. Si), which could modify the transition pressure and also properties of LDA and HDA metallic glasses. The minor alloying effect reported here is valuable for the development of more polyamorphous metallic glasses, even multicomponent bulk metallic glasses with modified properties, which will trigger more investigations in this field and improve our understanding of polyamorphism and metallic glasses.
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