Abstract
Gradient nanostructured surface (GNS) can enhance the properties of metals and alloys. Here, the effect of GNS layers on the lifetime of a Ti-based alloy were investigated. Stress-controlled high-cycle fatigue (HCF) tests were carried out to study the fatigue behavior of Ti–2Al–2.5Zr alloy tubes with different GNS layers obtained via deep rolling (DR) treatment. The fracture failure mechanism was analyzed using the quantitative tilt technique, continuous-slice method, and electron backscatter diffraction. The DR samples had lower surface roughness, an added hardening layer, and better comprehensive mechanical properties than the as-received samples. Furthermore, after 107 cycles of the DR treatment, the fatigue strength of the samples was enhanced from 166.5 to 189 MPa, and the initiation sites of the fatigue cracks moved from the surface to the subsurface. The facets of crack initiation along the slip system in the as-received samples were revealed. The nanocrystals and twins generated by DR treatment were considered to retard crack initiation and propagation, thus increasing HCF life.
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