Anomalous Viscoelastic Behavior of Metallic Glasses of Pd–Si-Based Alloys

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  • H. S. Chen
    Belfer Graduate School of Science, Yeshiva University, New York, New York 10033
  • M. Goldstein
    Belfer Graduate School of Science, Yeshiva University, New York, New York 10033

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<jats:p>The temperature and the stress dependence of viscoelastic properties of metallic glasses of three compositions: Pd0.795Au0.04Si0.165, Pd0.795Ag0.04Si0.165 and Pd0.775Cu0.06Si0.165 have been studied near the glass temperature. The total retarded tensile compliance of these alloy glasses, J̃d0 is small at low temperature (of the order of glass compliance J̃g) but increases rapidly in a narrow temperature range when the temperature approaches Ta, at which the viscosity of the glass attains 1012 P, and attains a value as high as 200 times the glass compliance J̃g for the Pd0.775Cu0.06Si0.165 glassy alloy, at T &gt; Ta + 15°K. Concurrent with an increase in J̃d0 near Ta, the alloy liquids become non-Newtonian in the stress range employed (σ varies from 6×106 to 3×108 dyn/cm2). The apparent shear activation volume for the viscous flow deduced from the non-Newtonian behavior increases with temperature and attains a value as high as 100 times the atomic volume. These results have been compared with viscoelastic behavior of other types of liquids. It is suggested that the strong temperature dependence of the shear compliance of metallic liquids near Tg may be attributed to some sort of macroscopic structural rearrangements taking place as temperature is changed. The large activation volume of viscous flow seems to imply that the flow mechanism involves a large number of simultaneous atomic displacements in the flow direction.</jats:p>

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