THE THERMAL AGING AND TWO WAY MEMORY EFFECT (TWME) IN Cu-Al-Be SHAPE MEMORY ALLOY

Abstract

In this study T.T.P. (Temperature, Time, Precipitation) curves of p-Cu-Al-Be have been determined by Differential Scanning Calorimetry technique. This alloy have been found to shows a remarkable thermal stability. The training experiments and the obtained two way memory effect (TWME) have shown that this alloy exhibits a good ability to memory properties comparable to the ones obtained on Cu-Zn-A1 and Cu-Al-Ni. The aging kinetics of TWME have been drawn for several temperatures. This work has confirmed the hypothesis already advanced concerning Cu-Zn-Al and Cu-Al-Ni alloys, namely that the TWME aging is mainly due to the dislocation recovery, and in this case is independent of the precipitation phenomenon. Introduction: