The rheological characterisation of metal melts poses several challenges due to their following characteristic properties: very low viscosities in the one-digit mPas range, strong oxidation tendency, high surface tension, and high density. An air-bearing rheometer with high sensitivity, a reducing purging gas to avoid oxidation, and a profiled measuring geometry with a narrow measuring gap to avoid slip and turbulent vortices are required.
A comprehensive rheological characterisation of liquid and semi-solid metal melts is presented, considering shear rate and temperature as major influencers on viscosity. Further, density characterisation of the metal alloys and dynamic mechanical analysis of the solid sample are presented.
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