期刊
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
卷 14, 期 -, 页码 262-268出版社
ELSEVIER
DOI: 10.1016/j.jmrt.2021.06.053
关键词
Titanium aluminides; Oxidation resistance; Layered structure; Alloying
资金
- National Natural Science Foundation of China [51801042, 51704088, 51971075, 51775150]
A novel laminated TiAl matrix composite with alternating equiaxed grain layers and fully lamellar grain layers was successfully fabricated using hot pressing and multi-step reaction annealing. The oxidation behavior of the composite at 800 degrees C was studied, showing a typical multilayer oxide scale structure. Although there were differences in oxidation behavior between different grain layers, the thickness of the oxide scale was almost identical, indicating isotropic oxidation resistance. The addition of Si effectively enhanced the oxidation resistance of the composite.
A novel laminated TiAl matrix composite (LMC) consisting of alternating equiaxed grain layers (EGLs) and fully lamellar grain layers (FGLs) has been fabricated successfully by hot pressing of alternating Ti/Al-6Si foils and subsequent multi-step reaction annealing. The oxidation behavior of the LMC at 800 degrees C was studied. The results show that the oxide scale is formed with typical multilayer structure after oxidized at 800 degrees C for 100 h. The oxidation behavior is different between EGLs and FGLs while the thickness of oxide scale is almost identical, suggesting an isotropy oxidation resistance of the LMC. Si addition effectively enhances the oxidation resistance of the LMC. (C) 2021 The Author(s). Published by Elsevier B.V.
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