Abstract:
The forged TC11 titanium alloy with a basket-weave microstructure was treated by low-energy electromagnetic shocking. The maximum surface temperature of the specimen during the shocking was no more than 200 ℃. The evolution of the microstructure and the impact toughness during low-energy electromagnetic shocking was investigated. The results show that low-energy electromagnetic shocking promoted a certain degree of phase transformation in TC11 titanium alloy. With the extension of low-energy electromagnetic shocking time, the proportion of β phase first increased and then decreased, the compactness of α phase first decreased and then increased, and the impact absorption energy first increased and then decreased. When the shocking time exceeded 0.88 s, the impact absorption energy was lower than that of the unshocked test alloy. When the low-energy electromagnetic shocking time was 0.44 s, the impact toughness of the test alloy was the best, with an impact absorption energy of 170.5 J, which was about 14.1% higher than that of the unshocked test alloy. The improvement in impact toughness was related to the increase in β phase content, the formation of intermediate phase layers at the α/β phase boundary, and the local spheroidization.