STABILIZATION OF MARTENSITE IN Cu-Zn-Al ALLOY AND ITS REVERSE SHAPE MEMORY EFFECT
(Department of Materials Science and Engineering,Central South University of Technology, Changsha 410083, P. R. China)
Abstract: The stabilization of martensite in Cu-14.5%Zn-7.1Al%(mass fraction) alloy was studied by SME measurement, optical microscope observation, X-ray diffraction and TEM. In the stabilization process, the alloy exhibited reverse shape memory effect while reordering state almost didn’t change, and the density of stacking faults decreased. It is concluded that the stabilization of martensite is the process ofM18R→N18R which is a diffusion shear. The similarity of the crystal transformation betweenM18R→N18Randβ1→Mis the origin of the reverse SME in our experiment.
Key words: SMA stabilization of martensite reverse shape memory effect