Hot Deformation Behavior and Microstructure Evolution of Platinum

Abstract:

The hot deformation behavior of platinum was investigated through hot compression experiments. A constitutive equation for the prediction of the flow behavior of platinum was derived from analysis of stress-strain curves. Using the constitutive equation, the peak stress of platinum during hot working was calculated across varying temperatures and strain rates. Results show that the predicted values have strong agreement with experimental results. Electron backscatter diffraction analysis further reveals the thermal deformation mechanisms under distinct conditions within the safe processing region. The optimal processing parameters are identified as deformation temperatures of 860–910 K and strain rates of 0.01–0.1 s^-1. Discontinuous yielding observed at elevated strain rates is attributed to the multiplication and movement of the mobile dislocations at grain boundaries.