EFFECTS OF MICROSTRUCTURES ON THE DEFORMATION AND FRACTURE BEHAVIORS OF TiAl-BASED ALLOYS

来源期刊：中南大学学报(英文版)1996年第2期

论文作者：Chen Xiaoqun He Yuehui Liu Wensheng Qu Xuanhui Huang Baiyun

文章页码：37 - 40

Key words：microstructure; deformation; fracture; TiAl-based alloy

Abstract: The fracture toughnessKIc, the tensile deformation and fracture behaviors of different microstructures ofγ-TiAl based alloy, Ti-33Al3Cr-0.5Mo] were studied at room temperature. It is found that the K_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 highest K_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.