Elastic Anomaly and Polyamorphic Transition in (La, Ce)-based Bulk Metallic Glass under Pressure
- Stony Brook Univ., NY (United States). Dept. of Geosciences
- Jilin Univ., Changchun (China). State Key Lab. of Superhard Materials, College of Physics
- Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
- Zhejiang Univ., Hangzhou (China). International Center for New-Structured Materials (ICNSM), Lab. of New-Structured Materials, State Key Lab. of Silicon Materials, and School of Materials Science and Engineering
- Stony Brook Univ., NY (United States). Mineral Physics Inst.
In this paper, we discovered that in association with the polyamorphism of La32Ce32Al16Ni5Cu15 bulk metallic glass, the acoustic velocities, measured up to 12.3 GPa using ultrasonic interferometry, exhibit velocity minima at 1.8 GPa for P wave and 3.2 GPa for S wave. The low and high density amorphous states are distinguished by their distinct pressure derivatives of the bulk and shear moduli. The elasticity, permanent densification, and polyamorphic transition are interpreted by the topological rearrangement of solute-centered clusters in medium-range order (MRO) mediated by the 4f electron delocalization of Ce under pressure. The precisely measured acoustic wave travel times which were used to derive the velocities and densities provided unprecedented data to document the evolution of the bulk and shear elastic moduli associated with a polyamorphic transition in La32Ce32Al16Ni5Cu15 bulk metallic glass and can shed new light on the mechanisms of polyamorphism and structural evolution in metallic glasses under pressure.
- Research Organization:
- Stony Brook Univ., NY (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); National Natural Science Foundation of China (NSFC)
- Grant/Contract Number:
- NA0002907; EAR1524078; 51371157; U14321056
- OSTI ID:
- 1358619
- Journal Information:
- Scientific Reports, Vol. 7, Issue 1; ISSN 2045-2322
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Experimental and theoretical studies on the elasticity of tungsten to 13 GPa
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journal | August 2018 |
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