Effects of B and Y Additions on the Microstructure and Tensile Behaviour of High-Nb TiAl Alloys

doi:10.12442/j.issn.1002-185X.20200432

Home > Archive>Volume 50, Issue 8, 2021 >2760-2764. DOI:10.12442/j.issn.1002-185X.20200432

Effects of B and Y Additions on the Microstructure and Tensile Behaviour of High-Nb TiAl Alloys
DOI:
                        10.12442/j.issn.1002-185X.20200432
                    
Author:
                        Gong Ziqi1Gong Ziqi
School of Mechanical Engineering, Tianjin Sino-German University of Applied Sciences, Tianjin 300350, China
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Wu Jin1Wu Jin
School of Mechanical Engineering, Tianjin Sino-German University of Applied Sciences, Tianjin 300350, China
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Sun Wei1Sun Wei
School of Mechanical Engineering, Tianjin Sino-German University of Applied Sciences, Tianjin 300350, China
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Chen Ziyong2Chen Ziyong
College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
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Nie Zuoren2Nie Zuoren
College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
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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
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Fund Project:National Natural Science Foundation of China (51301005); Tianjin Education Commission Scientific Research Project (2019KJ139)

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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.

Key words:TiAl;microsegregation;tension;microstructure

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[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

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Received:June 19,2020
Revised:August 22,2020
Adopted:August 28,2020
Online: September 07,2021
Published: August 31,2021

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