Pseudo-Plastic Behaviour of Single-Crystals of Cu-Base Memory Alloys

¹ 1st Memory Alloys GmbH Techn. Büro Berlin, Sembritzkistr. 9A, 12169 Berlin, Germany
² 1st Memory Alloys GmbH Hauptstrasse 24, 61279 Grävenwiesbach 2, Germany

Abstract

The hysteretic behaviour of Cu-Al-X single-crystals (with X = Zn, Mn, Ni) deforming in the martensitic state is investigated. The tension-compression partial and complete deformation cycles show no dependence of the hysteresis on the temperature, a zero-stress diagonal, at which the yields recovery begin "Return point memory'' and degradation of the hysteresis with decreasing deformation amplitude have been found at the pseudo-plastic behaviour. Thermodynamic transformation parameters and the hysteresis interior of complete and partial thermal- induced, stress-free transformations arc received by calorimetry.