On the nature of a peculiar initial yield behavior in metastable β titanium alloy Ti-5Al-5Mo-5V-3Cr-0.5Fe with different initial microstructures

•Peculiar yielding behavior during warm compression in Ti-5553 was studied in depth.•Completely different slip characteristics and dynamic precipitation of αs occurred.•Macro/micro compressive characteristics and mechanisms were systematically summarized.•SEM/TEM/crystallographic calculation/crystal plastic finite element simulation was used.