Low cycle fatigue behavior and deformation mechanism of different microstructures in Ti-5Al-5Mo-5V-3Cr alloy

Two fundamental questions have been addressed on a recently developed high strength ? Ti alloy, Ti-5Al-5V5Mo-3Cr, with respect to two very different types of microstructures, one bimodal and the other fully lamellar, both having similar yield strength. Those are: 1) If and what would be the difference in their LCF response? 2) What would be the sequence of plastic deformation among the phases of different morphology, ?, globular ? and lath ?? TEM based deformation micro mechanism explained the LCF response at various strain amplitudes. Crack path-microstructure interaction explained the difference in life, specifically observed at low strain amplitude.

Automated summary

Two different types of microstructures, bimodal and fully lamellar, in a high strength Ti alloy, Ti-5Al-5V5Mo-3Cr, were studied to understand their low cycle fatigue response and plastic deformation sequence among different phases. Transmission electron microscopy revealed deformation micro mechanisms at various strain amplitudes, while crack path-microstructure interaction explained the observed differences in life at low strain amplitudes.