The fracture toughness KIc, the tensile deformation and fracture behaviors of different microstructures of γTiAl based alloy, Ti33Al3Cr05Mo] were studied at room temperature. It is found that the KIc value is lower i...The fracture toughness KIc, the tensile deformation and fracture behaviors of different microstructures of γTiAl based alloy, Ti33Al3Cr05Mo] were studied at room temperature. It is found that the KIc value is lower in the duplex microstructure, and increases with the increase of vol pct of the lamellar microstructure, and that the full lamellar has the highest KIc value. Cleavage was the dominant fracture mechanism in the duplex microstructure material. In contrast, for the full lamellar microstructure the high anisotropy of deformation and the large strain discontinuity at grain boundaries resulting in decohesion of grain boundaries are the main fracture processes.展开更多
基金the NationalNatural+8 种基金 ScienceFoundationof China, National AdvancedMaterialsCommiteeofChina
文摘The fracture toughness KIc, the tensile deformation and fracture behaviors of different microstructures of γTiAl based alloy, Ti33Al3Cr05Mo] were studied at room temperature. It is found that the KIc value is lower in the duplex microstructure, and increases with the increase of vol pct of the lamellar microstructure, and that the full lamellar has the highest KIc value. Cleavage was the dominant fracture mechanism in the duplex microstructure material. In contrast, for the full lamellar microstructure the high anisotropy of deformation and the large strain discontinuity at grain boundaries resulting in decohesion of grain boundaries are the main fracture processes.
