PSEUDOELASTIC BEHAVIOUR AND TWO WAY MEMORY EFFECT IN Cu-Zn-Al ALLOYS

Abstract

Different types of training sequences and two memory effect (TWME) of polycristalline Cu-Zn-Al alloys have been studied : Thin plates have been loaded in torsion and tests samples were loaded in pure tension. Simultaneous resistance measurements were made to know the volume fraction of the martensite. As Friend, it is shown that the first martensite platelets formed are the most operational for training. In addition, the relation between the pseudoelastic strain epsilon(pe) and the martensite fraction z is non linear. The training can be quantified with the introduction of an internal kinematical stress X(e)underbar.