Per: lorena isabela de oliveira ribeiro (UFMG), João victor lucas amim (ufmg), pedro damas resende (ppgem/ufmg), jéssica dornelas silva (ppgem/ufmg), suzanny cristina soares martins (ppgem/ufmg), leandro de arruda santos (ufmg), vicente tadeu lopes buono (ufmg)
Abstract:
The aim of the present study was to evaluate, by rotary bending fatigue tests, the fatigue resistance of two different NiTi alloys under strain-controlled testing condition at 25°C. Besides that, the mechanical, thermal and structural properties of the wires were characterized by DSC, XRD, SEM/EDX and tensile tests. The results revealed that both materials were superelastic at room temperature and therefore presented an austenitic matrix and full shape recovery in load/unloading tests in tension. One of the samples has an oxide covered surface whilst the other has passed through a step of surface finishing. Also, it was determined that both materials are Ti-rich. Despite the similar properties, sample 1 presented 77 cycles to failure, while sample 2 resisted 1827 cycles.