Effects of microstructures on the deformation and fracture behaviors of TiAl-based alloys |
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Authors: | Chen Xiaoqun He Yuehui Liu Wensheng Qu Xuanhui and Huang Baiyun |
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Affiliation: | (1) Powder Metallurgy Research Institute, Central South University of Technology, 410083 Changsha, China |
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Abstract: | The fracture toughnessK
Ic, the tensile deformation and fracture behaviors of different microstructures ofγ-TiAl based alloy, Ti-33Al-3Cr-0.5Mo] were studied at room temperature. It is found that theK
Ic 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 highestK
Ic 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.
Project supported by the National Natural Science Foundation of China and National Advanced Materials Committee of China
Synopsis of the first author Chen Xiaoqun, associated professor, born in Jan. 1965, current research fields: physical metallurgy of high-temperature structural
intermetallic compounds. |
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Keywords: | microstructure deformation fracture TiAl-based alloy |
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