Stress-induced deformation at Ap～Mp and
thermal cycling behavior of Cu-Al-Ni single crystals
thermal cycling behavior of Cu-Al-Ni single crystals
(1. School of Materials Science and Engineering,
Harbin Institute of Technology, Harbin 150001， P.R.China;
2. Department of Materials and Chemical Engineering,
Liaoning Institute of Technology,Jinzhou 121001， P.R.China)
Harbin Institute of Technology, Harbin 150001， P.R.China;
2. Department of Materials and Chemical Engineering,
Liaoning Institute of Technology,Jinzhou 121001， P.R.China)
Abstract: Stressinduced deformation in Ap～Mp and concomitant shape recovery behavior of Cu-13.4Al-4.0Ni single crystals were studied. Abnormal high stress-induced deformation exists in Ap～Mp 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 increasing cycling number, the recovery part from normal reverse transformation decreases, while that from reverse transformation of stabilized martensite by over-heating increases, which shows a typical stabilization of martensite.
Key words: CuAlNi single crystal; stress-induced deformation; two way shape memory; superelasticity; stabilization of martensite