Pressure-induced amorphous-to-amorphous configuration change in Ca-Al metallic glasses

Pressure-induced amorphous-to-amorphous configuration changes in Ca-Al metallic glasses (MGs) were studied by performing in-situ room-temperature high-pressure x-ray diffraction up to about 40 GPa. Changes in compressibility at about 18 GPa, 15.5 GPa and 7.5 GPa during compression are detected in Ca...

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Published inScientific reports Vol. 2; no. 1; p. 376
Main Authors Lou, H B, Fang, Y K, Zeng, Q S, Lu, Y H, Wang, X D, Cao, Q P, Yang, K, Yu, X H, Zheng, L, Zhao, Y D, Chu, W S, Hu, T D, Wu, Z Y, Ahuja, R, Jiang, J Z
Format Journal Article
LanguageEnglish
Published England Nature Publishing Group 2012
Subjects
Absorption Fine-Structure
Alloys
Applied physics
Behavior
Calcium
Compressibility
Compression
Laboratories
Liquid
Materials science
Order
Phase
Phase transitions
Pressure
Radiation
Temperature effects
Transition
Water
X-ray diffraction
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Summary:Pressure-induced amorphous-to-amorphous configuration changes in Ca-Al metallic glasses (MGs) were studied by performing in-situ room-temperature high-pressure x-ray diffraction up to about 40 GPa. Changes in compressibility at about 18 GPa, 15.5 GPa and 7.5 GPa during compression are detected in Ca(80)Al(20), Ca(72.7)Al(27.3), and Ca(66.4)Al(33.6) MGs, respectively, whereas no clear change has been detected in the Ca(50)Al(50) MG. The transfer of s electrons into d orbitals under pressure, reported for the pressure-induced phase transformations in pure polycrystalline Ca, is suggested to explain the observation of an amorphous-to-amorphous configuration change in this Ca-Al MG system. Results presented here show that the pressure induced amorphous-to-amorphous configuration is not limited to f electron-containing MGs.
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ISSN:2045-2322
2045-2322
DOI:10.1038/srep00376