Abstract
Considering the potential use of {gamma}-TiAl alloys for high temperature turbine materials, it is important to investigate the effect of microstructural variation on the fatigue crack propagation (FCP) behavior at room and high temperatures. Recent investigations on the FCP of {gamma}-TiAl alloys have shown that the fully lamellar microstructure represents superior crack growth resistance as compared to the other microstructures, such as duplex and near {gamma} microstructures, owing to the crack-tip shielding effects of lamellar structure. However, many fundamental questions on the FCP of {gamma}-TiAl alloys remain unsolved yet. In this investigation, the authors examined the fatigue crack growth resistance of Ti-47Al-1Cr-4Nb-0.2W-0.25Si-0.1B(at.%) alloy associated with the variation of the equiaxed {gamma}/lamellar volume fraction. A particular interest was given to study the role of colony/grain boundaries and lamellar interfaces on the FCP and to investigate the relative intrinsic fatigue properties of the above three microstructures.
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