Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 733, Issue -, Pages 190-198Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2018.07.019
Keywords
TiAl alloys; High-temperature properties; Microstructure evolution; Boron addition; Dislocations; Strengthening mechanism
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 boron addition on the microstructure evolution and high-temperature properties of Ti-43Al-6Nb-1Mo-1Cr alloys has been studied in this paper. With the boron content increasing from 0 at% to 1.0 at%, the ultimate tensile strength(UTS) at high temperature increase dramatically while the alloys with 1.0at%B exhibit UTS as 656.12 +/- 20.54 MPa at 800 degrees C, 642.43 +/- 14.44 MPa at 850 degrees C and 508.44 +/- 16.12 MPa at 900 degrees C, respectively. Meanwhile, boron addition could stabilize the high-temperature UTS of the alloys in 500-700 MPa with the temperature incresasing. Three types of strengthening mechanism in high-temperature strength caused by boron addition are also discussed and concluded.
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