Analysis of thermal stability of ausferrite obtained by means of cyclic heat treatment of Cu-Ni (Mn, Mo) ADI

A kinetic analysis of decomposition after 1-step and cyclic ADI heat treatments was performed. The activation energy values for decomposition of ausferrite obtained by cyclic heat treatment 270 °C ∧∨ 390 °C and 270 °C ∧∨ 350 °C - 156 and 181 kJ/mol, respectively were found. The comparison with the activation energy for decomposition of ausferrite obtained by standard, 1-step heat treatment - 249 kJ/mol (270 °C), 230 kJ/mol (310 °C), 174 kJ/mol (350 °C) and 170 kJ/mol (390 °C) indicates that the cyclic heat treatment does not improve thermal stability of ausferrite.