Paper Title:
Elastic Properties of Cu-Based Bulk Metallic Glass around Glass Transition Temperature
  Abstract

Temperature dependent elastic constants Cij(T) of Cu60Hf30Ti10 bulk metallic glass (BMG) have been investigated in a MHz frequency range using electromagnetic acoustic resonance (EMAR) up to 823 K. At room temperature, the BMG showed high Poisson’s ratio ν arising from low shear modulus G compared with that of constitutive crystalline elements. With increasing temperature, G showed usual linear temperature dependence while it suddenly drops around glass transition temperature, Tg. Within a framework of quasiharmonic approximation, Grüneisen parameter γ around Tg is estimated to be 10. This extremely large γ indicates the high anhramonicity of long wavelength limit acoustic mode phonon in the supercooled liquid state. The unusual elastic behavior can be interpreted on the basis of heterogeneous microstructure.

  Info
Periodical
Materials Science Forum (Volumes 539-543)
Main Theme
Edited by
T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran
Pages
1932-1936
DOI
10.4028/www.scientific.net/MSF.539-543.1932
Citation
R. Tarumi, H. Ogi, M. Hirao, T. Ichitsubo, E. Matsubara, J. Saida, "Elastic Properties of Cu-Based Bulk Metallic Glass around Glass Transition Temperature", Materials Science Forum, Vols. 539-543, pp. 1932-1936, 2007
Online since
March 2007
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