| Summary: | A high temperature high vacuum rheometer has been designed, fabricated,
and tested for the study of the steady shear viscosity for multicomponent bulk
metallic glass forming alloys. This rheometer has an operating range up to
1525 K, rotational frequencies of 9.4*10⁻³-3.7*10¹ radians/s, and a
calibrated viscosity range of 9.6*10⁻³ and 1.2*10² Pa*s while maintaining
absolute pressures pressure < 1*10⁻⁶ mbar.
Zr[subscript 41.2]Ti[subscript 13.8]Cu[subscript 10.0]Ni[subscript 12.5]Be[subscript 22.5] (Vitreloy 1) is reported. The unexpected findings
of non-Newtonian behavior above the liquidus temperature were observed.
Observations of shear thinning, thixotropic, and viscoelastic behaviors have
been made. Our results show that Vitreloy 1 can be modeled as a power law
fluid, with a power law exponent of approximately -0.5 for high shear rates.
We attribute the non-Newtonian behavior to structural ordering within the
melt. The technological and scientific implications for non-Newtonian behavior are discussed. === Graduation date: 2005
|
|---|
