DEPENDENCE OF PSEUDOELASTICITY PARAMETERS ON THE MECHANICAL AND THERMAL HISTORIES OF A SHAPE MEMORY ALLOYED EXPERIMENTAL BRASS

摘要

During mechanical cycling, energy storage efficiency increases and disipative energy decreases while both total and permanent strains increase, though a closed stress-strain loop was obtained in the 5the cycle of each series.Iced cater quenching largely increases plasticity while tempering alters tensile behaviour, enhancing at least one stress-induced reversible martensitic transformatin.After homogenization and iced water quenching, the highest values of the strain recovery degree (91,6 percent) and the energy storage efficiency (91,15 percent) were caused by tempering at 400 and 500 deg C, respectively.