Correlation between medium-range order structure and glass-forming ability for Al-based metallic glasses

Wu, N. C., Yan, M., Zuo, L. and Wang, J. Q. (2014) Correlation between medium-range order structure and glass-forming ability for Al-based metallic glasses. Journal of Applied Physics, 115 4: . doi:10.1063/1.4863404

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Author Wu, N. C.
Yan, M.
Zuo, L.
Wang, J. Q.
Title Correlation between medium-range order structure and glass-forming ability for Al-based metallic glasses
Journal name Journal of Applied Physics   Check publisher's open access policy
ISSN 0021-8979
1520-8850
Publication date 2014-01-01
Year available 2014
Sub-type Article (original research)
DOI 10.1063/1.4863404
Open Access Status File (Publisher version)
Volume 115
Issue 4
Total pages 7
Place of publication College Park, MD, United States
Publisher American Institute of Physics
Language eng
Formatted abstract
To clarify the correlation of medium-range order (MRO) structure with glass forming ability (GFA) of Al-based metallic glasses, Al 86 Ni 14-aYa (a = 2∼9 at. %) metallic glasses were analyzed by x-ray diffraction in detail and further verified by synchrotron high-energy x-ray diffraction. The prepeak that reflects the MRO structural evolution was found to be much sensitive to alloy composition. We have proposed an icosahedral supercluster MRO structure model in Al-TM (transition metal)-RE (rare earth metal) system, which consists of 12 RE(TM)-centered clusters on the vertex of icosahedral supercluster, one RE(TM)-centered clusters in the center, and TM(RE) atoms located at RE(TM)-centered cluster tetrahedral interstices in the icosahedral supercluster. It was indicated that the MRO structural stability mainly depends on the interaction of efficient dense packing and electrochemical potential equalization principle. The Al 86 Ni 9Y(La)5 alloys present good GFA due to the combination of the two structural factors.
Keyword Local atomic order
X-ray diffraction
Thermal stability
Alloys
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article number 043523.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2015 Collection
 
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