STUDY ON PLASTIC FORMING OF METAL-ALLOYS IN PARTLY-LIQUID STATE

The paper presents a fragment of the work on the formability of alloys in the partly liquid state carried out at the University of Mining an d Metallurgy in Krakow, Poland. The process of upsetting of cylindrica l samples is investigated and the aluminum alloy 2024 (ASTM) of a rela tively large crystallization temperature range Is used as a testing ma terial. The investigation focuses on the effect of the solid fraction (weight percentage of solid component in the alloy, pre-heated to the temperature above the solidus point) on the process parameters. Therma l-mechanical finite-element model developed for the compression test a nd adapted to the partly liquid conditions is used for the calculation s of the distributions of strain rates, strains and temperatures. The micrographs of the samples after preheating and after deformation in b oth solid and partly liquid conditions are also presented in the paper .