Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 794, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2020.139803
Keywords
TiAl alloy; Microstructure; Tensile properties; Edge-to-Edge matching model
Categories
Funding
- National Natural Science Foundation of China [51001040, 51371064]
- Shanghai Aerospace Science and Technology Innovation Fund [SAST201428]
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The effect of nano-Y2O3 addition on microstructure and tensile properties of high-Al TiAl alloys prepared by induction skull melting is investigated. The result shows that the addition of nano-Y2O3 affords an obvious refinement in lamellar colony due to the heterogeneous nucleation. A crystallographic model is used to predict the alpha and gamma nucleation potencies of Y2O3 particles during solidification. Besides, Y2O3 induces the solidification pathway of TiAl alloys into high-Al side, resulting in the increase of gamma phase. Owing to fine grain strengthening and second phase strengthening, the tensile strength and elongation of TiAl-Y2O3 alloys are enhanced significantly at room temperature.
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