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

被引：0

作者：

R. T. Zheng

Y. G. Zhang

C. Q. Chen

机构：

[1] Beijing Normal University,Key Laboratory of Radiation Beam Technology and Materials Modification of Ministry of Education, Institute of Low Energy Nuclear Physics

[2] Beijing University of Aeronautics and Astronauts,Material Science and Engineering Department

来源：

Journal of Materials Science | 2004年 / 39卷

关键词：

Polymer; Grain Size; Microstructure; Plastic Deformation; Density Increase;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Microcracks and their effect on the plastic deformation of γ-TiAl alloy with fully lamellar microstructure (FL) at relatively low strain rate (1 × 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 γ/α2 interfaces and gather at grains with soft-orientations. Based on the observation and analysis, a model of microcrack nucleation in FL γ-TiAl alloy is built up. The plastic elongation of γ-based TiAl alloys with FL microstructure changes non-monotonously with the increase of grain size, which results from cooperation of micro-deformations and microcracks.

引用

页码：1721 / 1725

页数：4

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