Method for reducing damage during a superplastic deformation

摘要

The invention relates to a method making it possible to reduce the damage during a superplastic deformation. This method consists, at a given temperature and in microstructural and rate of deformation conditions resulting in the superplastic behaviour of the alloy in question, in applying successive partial deformations ( epsilon 0) during a time (t) which are separated by periods of rest ( epsilon = 0) during a time (t'). The value of t and t' are between 0.5 and 10 min and preferably between 1 and 3 min. This method makes it possible to obtain good tensile or fatigue mechanical characteristics without resorting to the use of a superimposed isostatic pressure. IMAGE