Creep at High Temperatures in Ni-Fe Alloys on Some Models of Work Hardening of Superstructures

摘要

The creep behavior of Ni3Fe and Ni-20 at % Fe alloys has been investigated in the temperature range between, approximately, 530 to 720C. The experimental activation enthalpy for creep was found to be, within the experimental error, in agreement with the available data for diffusion of Fe in Ni-Fe alloys for the case of the Ni-20 at % Fe alloy. For the stoichiometric composition it is suggested that the diffusion of Ni is the controlling factor. It is proposed that dislocation climbing is the rate controlling process for creep in the Ni-20 at % Fe alloy and gliding of dislocations through a short range ordered structure is controlling the creep rate in the Ni-25 at % Fe alloy. Several other experimental results are discussed. (Author)