Investigation into the deformation resistance of polycrystalline iridium

Abstract

Rheological properties of polycrystalline iridium of I 99.9 grade are investigated in order to construct the dependence of deformation resistance on studied factors (strain ratio, rate, and temperature). The tests of cylindrical samples made of iridium are performed using a cam plastometer in temperature range t = 900–1400°C at strain rates ξ = 0.2 and 20 s–1, as well as at t = 800–1400°C and ξ = 2 s–1 using the upsetting method at a strain rate up to 0.8. The results of investigations can be used to develop the pressure treatment of iridium wares at large plastic strains and in a broad range of thermomechanical parameters.