Ricerc@Sapienza

Here, a study aimed to determine the phase transition temperature of
titanium dioxide nanotubes, both in the presence and in the absence of a Ti layer
underneath, is reported. Titania nanotube arrays with different diameters and wall
thickness were synthesized via anodic growth at different potential values on a titanium
foil. Ex and in situ high-temperature X-ray diffraction measurements were performed,
respectively, on the arrays as such and on the powder obtained by detaching the

In the present paper, the fatigue behaviour of a near-equiatomic pseudo-elastic NiTi SMA (Shape Memory Alloy) is experimentally examined by means of tensile cyclic loading tests. In situ X-ray Diffraction (XRD) analyses are also performed in order to measure the contents of both austenite and martensite phase during testing. The experimental campaign highlights a stress–strain diagram defined through five different stress–strain functions.