Effects of Mn on fracture behaviour of DO3 Fe3Al-based intermetallic alloy |
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| Authors: | LOU Baiyang X B Zhang LIU Maosen Z Zhang |
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| Affiliation: | (1) Department of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, 310014, People's Republic of China;(2) Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, People's Republic of China;(3) Beijing Laboratory of Electron Microscopy, Chinese Academy of Science, P.O. Box 2724, Beijing, 100080, People's Republic of China |
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| Abstract: | The fracture behaviour of DO3 Fe3Al-based intermetallic alloys with and without Mn (1.5 at%) were investigated by tensile tests (TT), transmission electron microscope (TEM) and scanning electron microscope (SEM). The results show that the addition of Mn could improve mechanical properties of the alloy, including room temperature ductility and high temperature strength. DO3 Fe–28Al fractured in a transgranular cleavage mode at room temperature and it gradually changed to a ductile style with temperature increasing, whereas the sample with addition of Mn fractured mainly in a mixed intergranular–transgranular cleavage mode. Three major factors are considered to have effect of Mn on fracture behaviour of the alloys: reducing grain size, promoting slip and cross slip and enhancing cleavage strength. © 1998 Chapman & Hall |
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