MEASUREMENTS OF RECOVERY STRESSES ON A FE-MN-CR-SI-NI SHAPE-MEMORY ALLOY

An apparatus of measurement of recovery stress has been used for a new ly developed stainless steel shape memory alloy. First measurements al low to show the real capabilities of this alloy to develop a high leve l of recovery stress at room temperature even after a cooling at low t emperature. A thermomechanical treatment called training has been used in such a way to improve the final recovery stress. Typically, it is possible to obtain a final recovery stress of 350MPa at room temperatu re after a pre-deformation of 1% and after a cooling at -50 degrees C.