High-temperature rotating cylinder rheometer for studying metallic glass forming liquids

A high-temperature Couette rotating cylinder rheometer has been developed for shear viscosity investigations of metallic glass forming liquids under precisely controlled flow and environmental conditions. These materials generally exhibit viscosities in the range of 10−2 to 10−1 Pa s above their liq...

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Veröffentlicht in:Review of scientific instruments 2018-11, Vol.89 (11), p.113904-113904
Hauptverfasser: Hembree, William, Bochtler, Benedikt, Busch, Ralf
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container_issue 11
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container_title Review of scientific instruments
container_volume 89
creator Hembree, William
Bochtler, Benedikt
Busch, Ralf
description A high-temperature Couette rotating cylinder rheometer has been developed for shear viscosity investigations of metallic glass forming liquids under precisely controlled flow and environmental conditions. These materials generally exhibit viscosities in the range of 10−2 to 10−1 Pa s above their liquidus temperature. While knowledge of the viscosity is crucial for estimating the glass forming ability and processing capabilities of these liquids, accurate rheological measurements are challenging due to their vulnerability to oxidation and contamination from the crucible and processing environment. Thus, the present device was constructed to measure the shear viscosities of these reactive melts in an inert atmosphere using shear cells manufactured from isostatically pressed graphite. A custom suite of LabVIEW programs provides all the necessary data acquisition tools and controls for the motor, inductive generator, sample temperature, and torque sensor. The setup includes a proportional-integral-derivative controller that allows for both isothermal and continuous heating/cooling experiments from room temperature up to 1400 K. The system is calibrated using NIST reference oils at room temperature. To demonstrate the functionality of the apparatus at high temperatures, the viscosity of the metallic glass forming alloy Zr59.3Cu28.8Al10.4Nb1.5 (AMZ4) was measured above the melting point and was found to be in excellent agreement with previously reported reference values from levitation-based measurement techniques.
doi_str_mv 10.1063/1.5039318
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source AIP Journals Complete; Alma/SFX Local Collection
subjects Amorphous materials
Crucibles
Glass formation
High temperature
Inert atmospheres
Levitation
Liquids
Liquidus
Measurement techniques
Melting points
Melts
Metallic glasses
Oxidation
Proportional integral derivative
Rheological properties
Rheometers
Rotating cylinders
Rotation
Scientific apparatus & instruments
Shear viscosity
Temperature
Torquemeters
Viscosity
title High-temperature rotating cylinder rheometer for studying metallic glass forming liquids
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