engleski

Microstructural analysis of CuAlNiMn shape-memory alloy before and after the tensile testing

In this paper the results of microstructural analysis before and after fracture along with mechanical properties and hardness of the CuAlNiMn shape memory alloy are presented. Melting of the alloy was carried out in vacuum- induction furnace in a protective atmosphere of argon. The alloy was cast into ingot of 15 kg. After casting the alloy was forged and rolled into rods with a diameter of approximately 10 mm. A microstructural characterization was performed by optical microscopy (OM) and scanning electron microscopy (SEM) equipped with energy-dispersive spectrometry (EDS). Martensitic microstructure was observed in the rods after deformation. The fractographic analysis of the samples after the tensile testing revealed some areas with intergranular fracture. However, the greater part of the fracture surface indicate the pattern of transgranular brittle fracture. The results of tensile tests showed the tensile strength of 401.39 MPa and elongation of 1.64%. The hardness of the CuAlNiMn alloy is 290.7 HV0.5.

shape-memory alloy ; CuAlNiMn ; fracture analysis ; microstructure ; hardness

Glavni autor: Ivana Ivanić, Stjepan Kožuh