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Pressure-induced Elastic Anomaly in a Polyamorphous metallic glass

Pressure-induced Elastic Anomaly in a Polyamorphous Metallic...

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第十一届中国钢铁年会

作者： Zeng Qiaoshi Zeng Zhidan Lou Hongbo Kono Yoshio Zhang Bo Curtis Kenney-Benson Park Changyong Mao Wendy L. Center for High Pressure Science and Technology Advanced Research (HPSTAR) HPCAT Geophysical Laboratory Carnegie Institution of Washington Institute of Amorphous Matter Science School of Materials Science and Engineering & Anhui Provincial Key Lab of Functional Materials and Devices Hefei University of Technology Geological Sciences Stanford University Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory

The pressure-induced transitions discovered in metallic glasses(MGs) have attracted considerable research interest offering an exciting opportunity to study polyamorphism in densely packed *** the large body of work on these systems, the elastic properties of the MGs during polyamorphic transitions remain *** this work, using an in situ high-pressure ultrasonic sound velocity technique integrated with synchrotron radiation x-ray radiography and x-ray diffraction in a Paris-Edinburgh cell, we precisely determined both the compressional and shear wave sound velocities of a CeAlCuCo metallic glass up to 5.8 GPa through its polyamorphic ***, its elastic moduli and Poisson’s ratio versus pressure were all *** the first time, we observed elastic anomalies with minima(at .5 GPa) in the sound velocities, bulk modulus, and Poisson’s ratio of a metallic *** with the compression behaviors of the silica glass and the crystalline Ce in detail, we conclude that the elastic anomaly is closely associated with the pressure-induced *** addition, sound velocities have been extensively used to calculate the density of glasses under *** found that the density of CeAlCuCo metallic glass calculated from sound velocities obviously deviated from the directly measured density when a polyamorphic transition *** results suggest that the density-sound velocity relationship may be invalid in glasses with a polyamorphic transition, although the transition is continuous.

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