The author presented this paper as an invited keynote lecture at The 6th International ESAFORM conference on Material Forming, Salerno, Italy, April 28-30, 2003. The paper has also been published in the conference Proceedings.Semisolid metals, used in thixoforming, are thixotropic. The slurry viscosity is shear-rate and time dependent provided the semisolid microstructure consists of solid spheroids surrounded by liquid. Thixoforming takes less than 1 second, during which time the structure of the material breaks down. The transient behaviour of semisolid slurries is thus critical to die filling. For solid fractions less than 50%, this breakdown can be studied by viscometry, using rapid data-collection rates, by imposing rapid increases in shear rate on the slurry. For solid fractions greater than 50%, different techniques, such as rapid compression in the thixoformer itself, must be used. Here such experiments with Sn 15%Pb and with aluminium alloys will be described.This work was carried out as part of EPSRC Grant GR/L/98473
To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.