Stress-induced deformation at A_p-M_p and thermal cycling behavior of Cu-Al-Ni single crystals

The stress-induced deformation in A_p-M_p and the concomitant shape recovery behavior of Cu-13.4Al-4.0Ni single crystals were studied. Abnormal high stress-induced deformation exists in A_p-M_p under the conditions of either heating with load or cooling with load. The recovered deformation is successively composed of four parts: the recoveries from superelasticity, normal reverse transformation, thermally activated reverse transformation of partially stabilized martensite and reverse transformation of stabilized martensite by over-heating. With the increase of cycling number, the recovery part from the normal reverse transformation decreases, while that from reverse transformation of stabilized martensite by overheating increases, which shows a typical stabilization of martensite.