ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
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 fromlow shear modulus G compared with that of constitutive crystalline elements. With increasingtemperature, G showed usual linear temperature dependence while it suddenly drops around glasstransition temperature, Tg. Within a framework of quasiharmonic approximation, Grüneisenparameter γ around Tg is estimated to be 10. This extremely large γ indicates the highanhramonicity 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
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.1932.pdf
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