Hot formability of the 2124/SiCp composite investigated by processing map

摘要

The hot working behaviour of aluminium composites reinforced with SiC particles (26vol.%) has been studied by the Process Map method. Temperatures ranging from 300℃ to 525℃ and strain rates ranging from 0.001 s~(-1) to 0.1 s~(-1) have been used. In particular the map calculated at 0.5 true plastic strain shows two domains which are considered safe for hot working deformation process: the first located about the temperature of 325-375℃ and strain rates of 0.008-0.03 s~(-1); the second spacing widely on all strain rates and closing to temperature of 500-525℃. At lower temperature (300-350℃) the material exhibits flow localization and banding phenomena, suggesting instability regime for plastic flow. Process Map sounds like a very promising method for hot deformation process optimisation, even if further tests at higher strain rates are required to approach industrial process parameters.