The Superplastic Behaviour of Anisotropic Metals Thermally Cycled under Stress

Abstract

The creep behaviour of uranium and zinc under concurrent application of a low tensile stress and temperature cycles is compared with their behaviour under isothermal conditions. High ductilities, sometimes approaching a superplastic level, are obtained under thermal-cycling conditions, in spite of the observed formation of porosity in the. specimen and the rapid decrease in density. The progress of void nucleation and growth under such conditions is examined.