STRAIN-HARDENING IN NI-3(AL, HF)

A method of repeated stress relaxations is used to determine the strain-hardening that takes place during stress relaxation tests performed at different temperatures and for various crystallographic deformation axises. It is shown that strain hardening for stress relaxation conditions is substantially higher than for constant strain-rate deformation conditions. This behaviour is found to be more and more pronounced with increasing temperatures. It is suggested that strain-hardening is not dislocation substructure dependent but is inherent to dislocation motion.