Calorimetric Studies of Dissolution Kinetics of Ni_2(Cr,Mo) Phase in Ni-Cr-Mo Alloys Using Non-!sothermal Approach

摘要

The kinetics of dissolution of ordered phase with PtjMo structure has been studied in two nickel chromium alloys - one without molybdenum and another with molybdenum - using differential scanning calorimetry. The activation energy for dissolution, determined using three non-isothermal approaches was found to be ~ 418 kJ /mole for both the alloys This value agreed very well with the activation energy for coarsening of y" precipitates in Ni-Cr-Mo matrix and is close to activation energy for mobility of chromium and molybdenum in complex nickel alloy matrix.