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In situ X-ray micro-tomography was performed to analyze the short crack growth in the microstructure (α, α+β phases and α/α+β interface) of two Ti-6Al-4V alloys. Short crack strongly interacts with th...e local microstructure and it grows into the predominant phase above the average microstructural fraction in each alloy. The increase in the volume fraction and size of the α grains results in a crack growth with lower variations and larger deflection lengths inside the clustered α grains. As the short crack grows, the larger plastic zones size in the high α-fraction alloy leads to the formation of secondary cracks and bifurcations that decrease the crack driving forces. Moreover, the larger deflections left behind the crack front induce higher crack closure and lower the crack driving forces. As a result, the short crack in the high α-phase fraction alloy remains sensitive to the local microstructural features at higher lengths.show more
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