Abstract
Compared with bimodal microstructure, the low-cycle fatigue (LCF) behavior and cyclic deformation mechanism of a near β Ti-3Al-5Mo-4Cr-2Zr-1Fe (Ti-35421) alloy with single β were systematically investigated. Lower strength, but higher ductility and longer LCF life were found for Single β. The nanoscale α'' martensite was detected in Single β by selected area electron diffraction pattern. Besides, slips and strain induced martensitic transformation played the major deformation mechanisms in Single β. Moreover, the existence of α'' contributed to the limit of microcracks nucleation in Single β, which resulted in a better fatigue life.
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