The Influence of γ-Irradiation on the Structure and Properties of the Cu-11.5 wt. % Al-4 wt. % Ni Shape Memory Alloys

Abstract

This study investigated the influence of 60Co-γ-irradiation on the structure and properties of Cu-Al-Ni shape memory alloys. The phase transformation temperatures were evaluated by differential scanning calorimeter (DSC). It was found that the γ-irradiation had a complex influence on the phase transformation parameters of Cu-Al-Ni SMAs. However, the transformation temperatures were shifted and a new curve was obtained after exposure to different irradiation doses. The thermodynamic parameters such as enthalpy and entropy tended to increase/decrease depending on the amount of the exposure. The structural properties of the exposed samples were studied by using optical microscopy and hardness measurements at room temperature. It was also found that the structural-properties of the Cu-Al-Ni SMAs were completely affected by the amount of the applied γ-irradiation dose.

Effect on Thermal and Structural Properties of Element Content in CuAlBe Shape Memory Alloys Irradiated with a Constant Gamma Radiation Dose

“…The Cu-based shape memory alloys can transform from the ordered DO3 structure to a long-period stacking structure known as 18R. Also, they can achieve shape recovery in the crystallization range known as the β-phase, which contains an irregular body-centered cubic (BCC) structure and can be observed at high temperature during the heating process [10][11][12][13].…”

“…Gamma irradiation is considered to be the most vital type of exposure because it can pass through protective layers and penetrate materials. Nevertheless, details on the effects of gamma (γ) irradiation on shape memory alloys are very useful for practical applications in the field of irradiated environments [10].…”