Influence of Ta Doping on Microstructure and Mechanical Properties of γ-TiAl Based Alloy

ZHANG Keren; ZHANG Lele; PAN Hengpei; CHEN Jieming; ZHAO Hui

Volume 37 Issue 6

Dec. 2022

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Development and Application of Materials > 2022 > 37(6): 76-82.

ZHANG Keren, ZHANG Lele, PAN Hengpei, CHEN Jieming, ZHAO Hui. Influence of Ta Doping on Microstructure and Mechanical Properties of γ-TiAl Based Alloy[J]. Development and Application of Materials, 2022, 37(6): 76-82.

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Influence of Ta Doping on Microstructure and Mechanical Properties of γ-TiAl Based Alloy

1. School of Materials Science and Engineering, Xa'an Shiyou University, Xi'an 710065, China;
2. Luoyang Ship Material Research Institute, Luoyang 471023, China

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Received Date: September 05, 2022
Available Online: January 11, 2023

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Abstract

The evolution behavior of massive γ (γ_m) quenching from single α-phase region in Ti-48Al-2Nb-2Cr-xTa (x=0, 1.0, 2.0) alloy is systematically studied. The electron back scattering diffraction method is used to character the grain orientation. The precipitation of γ_m phase can be greatly promoted by Ta element. The critical content of Ta, promoting or inhibiting the precipitation of γ_m, is 2% (atom fraction). Ta element can refine the γ_m subgrains, and the various γ_m variants can directly nucleate inside the α₂ grains in the form of BOR. In the course of growth, the γ_m nuclei selects its variant over the close-packed {111}γ plane, making the γ_m nuclei deviating from BOR.
- intermetallic compound,
- γ_m phase,
- Ta,
- nucleate,
- growth

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