Phonon excitations in Pd40Ni40P20 bulk metallic glass by inelastic X-ray scattering

Shinya Hosokawa, Masanori Inui, Yukio Kajihara, Tetsu Ichitsubo, Kazuhiro Matsuda, Hidemi Kato, Ayano Chiba, Koji Kimura, Kenji Kamimura, Satoshi Tsutsui, Hiroshi Uchiyama, Alfred Q.R. Baron

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

To clarify microscopic elastic properties of a Pd40Ni40P20 bulk metallic glass, inelastic X-ray scattering (IXS) experiments were carried out using high-resolution IXS spectrometer installed at BL35XU/SPring-8. Clear longitudinal acoustic (LA) excitation modes are observed in the whole momentum transfer Q range up to ~22 nm-1. The microscopic sound velocity of the LA modes obtained from the Q → 0 limit of the dispersion relation is about 12% faster than the macroscopic value, suggesting the microscopic heterogeneity in the elastic properties of this BMG. In addition, transverse acoustic (TA) modes can be deduced from a detailed analysis of the IXS spectra. The microscopic Poisson’s ratio obtained from the ratio of the excitation energies of the TA and LA modes is 0.47 ± 0.04, larger than the macroscopic value of 0.40. Thus, the fragile nature of this BMG already found in the macroscopic sense is much enhanced in the microscopic view.

Original languageEnglish
Title of host publicationTHERMEC 2016
EditorsChristof Sommitsch, Mihail Ionescu, Brajendra Mishra, Brajendra Mishra, Ernst Kozeschnik, T. Chandra
PublisherTrans Tech Publications Ltd
Pages767-772
Number of pages6
ISBN (Print)9783035711295
DOIs
Publication statusPublished - 2017
Event9th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2016 - Graz, Austria
Duration: 2016 May 292016 Jun 3

Publication series

NameMaterials Science Forum
Volume879
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Other

Other9th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2016
CountryAustria
CityGraz
Period16/5/2916/6/3

Keywords

  • Bulk metallic glass
  • Inelastic X-ray scattering
  • Phonon dynamics
  • Transverse mode

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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    Hosokawa, S., Inui, M., Kajihara, Y., Ichitsubo, T., Matsuda, K., Kato, H., Chiba, A., Kimura, K., Kamimura, K., Tsutsui, S., Uchiyama, H., & Baron, A. Q. R. (2017). Phonon excitations in Pd40Ni40P20 bulk metallic glass by inelastic X-ray scattering. In C. Sommitsch, M. Ionescu, B. Mishra, B. Mishra, E. Kozeschnik, & T. Chandra (Eds.), THERMEC 2016 (pp. 767-772). (Materials Science Forum; Vol. 879). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/MSF.879.767