Microcrack nucleation and its effect on the plastic deformation of FL gamma-TiAl alloy

作者：Zheng RT^*; Zhang YG; Chen CQ

来源：Journal of Materials Science, 2004, 39(5): 1721-1725.

DOI：10.1023/B:JMSC.0000016176.15217.51

Microcracks and their effect on the plastic deformation of gamma-TiAl alloy with fully lamellar microstructure (FL) at relatively low strain rate (1 x 10(-5)/s) has been investigated. It is found that a large number of microcracks nucleate within the grains. The microcrack density increases with the increase of grain size. Most of the microcracks nucleate at the gamma/alpha(2) interfaces and gather at grains with soft-orientations. Based on the observation and analysis, a model of microcrack nucleation in FL gamma-TiAl alloy is built up. The plastic elongation of gamma-based TiAl alloys with FL microstructure changes non-monotonously with the increase of grain size, which results from cooperation of micro-deformations and microcracks.

• 出版日期2004-3-1
• 单位北京师范大学