SOME ASPECTS OF PLASTIC-DEFORMATION OF METAL-ALLOYS IN PARTLY LIQUID-STATE

The work described in this paper is connected with Authors' earlier re search on the formability of alloys in partly liquid state, i.e. at th e temperatures exceeding their solidus points. Three aluminium based a lloys of a relatively large crystallization temperature range have bee n used as the testing materials. The investigation focused on the effe ct of the liquid fraction (weight percentage of liquid component in th e alloy, pre-heated to the temperature above its solidus point) on the parameters of the plastic deformation. The process of upsetting of th e cylindrical specimens is investigated. The prime objective of the wo rk is to determine the factors which affect the softening of various a lloys subjected to deformation in partly liquid state. An attempt of t he generalization of the problem is done. Thermal-mechanical finite el ement model developed for the compression process and adapted to the p artly liquid conditions is used for the calculation of the deformation parameters.