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Ultrasonic Measurements of the Elastic Properties of Lanthanum/Cerium-based Bulk Metallic Glass and its Compression Behavior under High Pressure

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dc.contributor.advisor Li, Baosheng en_US
dc.contributor.author Qi, Xintong en_US
dc.contributor.other Department of Materials Science and Engineering. en_US
dc.date.accessioned 2017-09-20T16:50:03Z
dc.date.available 2017-09-20T16:50:03Z
dc.date.issued 2014-12-01
dc.identifier.uri http://hdl.handle.net/11401/76339 en_US
dc.description 51 pg. en_US
dc.description.abstract Metallic glass, as a new member of glass family, has been at the cutting edge of material research for decades since it was first discovered in 1960. Its amorphous, densely packed microstructure makes it popular not only in industrial applications, but also in condensed matter physics. The elastic properties and their pressure dependence provide critical information about the bonding characteristics, microstructure and vibration features of metallic glasses. In this thesis, for the first time, the elastic wave velocities of (La<sub>0.5</sub>Ce<sub>0.5</sub>)<sub>64</sub>Al<sub>16</sub>Ni<sub>5</sub>Cu<sub>15</sub> bulk metallic glass are measured under high pressure up to 12.3 GPa using ultrasonic interferometry within a multi-anvil apparatus at room temperature. Analysis of acoustic and P-V data allows a direct determination of the elastic moduli such as the bulk modulus K, shear modulus G, Young's modulus E, and Poisson's ratio &nu. Both longitudinal and shear modes exhibit softening behavior under low pressure similar to that of typical oxide glasses. This implies that Ce-based bulk metallic glass contains short-range covalent-like bonds. At higher pressure, discontinuities in bulk and shear moduli are observed at 5.9 GPa. The Debye temperature and Vickers hardness are also investigated to further understanding of its mechanical properties. All these results enable us to gain insight into the high pressure behavior and physical properties of bulk metallic glass, and also to further our understanding of the polyamorphism in Ce-based metallic glasses. en_US
dc.description.sponsorship This work is sponsored by the Stony Brook University Graduate School in compliance with the requirements for completion of degree. en_US
dc.format Monograph en_US
dc.format.medium Electronic Resource en_US
dc.language.iso en_US en_US
dc.publisher The Graduate School, Stony Brook University: Stony Brook, NY. en_US
dc.subject.lcsh Materials Science en_US
dc.subject.other Cerium, high pressure, metallic glass en_US
dc.title Ultrasonic Measurements of the Elastic Properties of Lanthanum/Cerium-based Bulk Metallic Glass and its Compression Behavior under High Pressure en_US
dc.type Thesis en_US
dc.mimetype Application/PDF en_US
dc.contributor.committeemember Welch, David en_US
dc.contributor.committeemember Gersappe, Dilip. en_US

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