+Advanced Search
Effects of B and Y Additions on the Microstructure and Tensile Behaviour of High-Nb TiAl Alloys
Author:
Affiliation:

1.School of Mechanical Engineering, Tianjin Sino-German University of Applied Sciences, Tianjin 300350, China;2.College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China

Clc Number:

Fund Project:

National Natural Science Foundation of China (51301005); Tianjin Education Commission Scientific Research Project (2019KJ139)

  • Article
  • |
  • Figures
  • |
  • Metrics
  • |
  • Reference
  • |
  • Related
  • |
  • Cited by
  • |
  • Materials
  • |
  • Comments
    Abstract:

    The influence of B and Y on the microstructure, microsegregation, and tensile behaviour of the Ti45Al8Nb0.2W0.25Cr (at%) alloy was investigated. The β-stabilizer elements in the high-Nb TiAl alloy promote the formation of the γ phase in the microsegregation region and lead to the formation of large blocky microsegregation areas. The large blocky microsegregation regions with low specific surface areas reduce the nucleation rate of cavities and cracks at the interfaces of the microsegregation, which are harmful to colony boundary strengthening and decrease tensile resistance. The addition of B and Y affords an obvious refinement in the lamellar colony, renders an increasing opportunity for cavity nucleation at the colony boundary, and thus improves the tensile resistance. The tensile mechanisms of the alloys before and after (B, Y) addition were also compared and analysed.

    Reference
    Related
    Cited by
Get Citation

[Gong Ziqi, Wu Jin, Sun Wei, Chen Ziyong, Nie Zuoren. Effects of B and Y Additions on the Microstructure and Tensile Behaviour of High-Nb TiAl Alloys[J]. Rare Metal Materials and Engineering,2021,50(8):2760~2764.]
DOI:10.12442/j. issn.1002-185X.20200432

Copy
Article Metrics
  • Abstract:
  • PDF:
  • HTML:
  • Cited by:
History
  • Received:June 19,2020
  • Revised:August 22,2020
  • Adopted:August 28,2020
  • Online: September 07,2021
  • Published: August 31,2021