Effects of microstructures on the deformation and fracture behaviors of TiAl-based alloys

Xiaoqun Chen; Yuehui He; Wensheng Liu; Xuanhui Qu; Baiyun Huang

doi:10.1007/BF02652193

Journal of Central South University ›› 1996, Vol. 3 ›› Issue (2) : 140 -143. DOI: 10.1007/BF02652193

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Effects of microstructures on the deformation and fracture behaviors of TiAl-based alloys

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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.

Keywords

microstructure / deformation / fracture / TiAl-based alloy

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Xiaoqun Chen, Yuehui He, Wensheng Liu, Xuanhui Qu, Baiyun Huang. Effects of microstructures on the deformation and fracture behaviors of TiAl-based alloys. Journal of Central South University, 1996, 3(2): 140-143 DOI:10.1007/BF02652193

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