Elastic Properties of Cu-Based Bulk Metallic Glass around Glass Transition Temperature

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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.

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Periodical:

Materials Science Forum (Volumes 539-543)

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Edited by:

T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran

Pages:

1932-1936

Citation:

R. Tarumi et al., "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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$38.00

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