Microstructure characterization and hot corrosion mechanism of as-cast and heat treated high Nb containing TiAl alloy

Zhiping Sun; Wenqing Wu; Yongnan Chen; Zhanwei Yuan; Yongshuai Zhang; Xiping Guo

doi:10.1016/j.corsci.2021.109399

Microstructure characterization and hot corrosion mechanism of as-cast and heat treated high Nb containing TiAl alloy

Zhiping Sun, Wenqing Wu, Yongnan Chen, Zhanwei Yuan, Yongshuai Zhang, Xiping Guo

材料学院

Chang'an University

科研成果: 期刊稿件 › 文章 › 同行评审

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摘要

TiAl alloys possess broad development prospects in aerospace industry. To characterize hot corrosion behavior in service environment and provide comprehensive assessment of high Nb containing TiAl alloys, microstructure evolution and hot corrosion mechanism of them were focused. Ti-44Al-9Nb-0.5Si (TA1) and Ti-44Al-9Nb-0.5Si-0.3Y (TA2) solidified via β phase; β/α transformation took place after β solidification; α was finally deposed to α₂+γ lamellae. Compared with TA1, TA2 had better hot corrosion resistance due to its finer lamellar structure. Based on Ti-Al-9Nb-0.5Si vertical section, heat treatment was conducted. After heat treatment, equiaxed γ grains, α₂ grains and Ti₅(Si,Al)₃ precipitations appeared.

源语言	英语
文章编号	109399
期刊	Corrosion Science
卷	185
DOI	https://doi.org/10.1016/j.corsci.2021.109399
出版状态	已出版 - 6月 2021

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title = "Microstructure characterization and hot corrosion mechanism of as-cast and heat treated high Nb containing TiAl alloy",

abstract = "TiAl alloys possess broad development prospects in aerospace industry. To characterize hot corrosion behavior in service environment and provide comprehensive assessment of high Nb containing TiAl alloys, microstructure evolution and hot corrosion mechanism of them were focused. Ti-44Al-9Nb-0.5Si (TA1) and Ti-44Al-9Nb-0.5Si-0.3Y (TA2) solidified via β phase; β/α transformation took place after β solidification; α was finally deposed to α2+γ lamellae. Compared with TA1, TA2 had better hot corrosion resistance due to its finer lamellar structure. Based on Ti-Al-9Nb-0.5Si vertical section, heat treatment was conducted. After heat treatment, equiaxed γ grains, α2 grains and Ti5(Si,Al)3 precipitations appeared.",

keywords = "A. Alloy, B. SEM, B. Weight loss, C. High temperature corrosion, C. Hot corrosion",

author = "Zhiping Sun and Wenqing Wu and Yongnan Chen and Zhanwei Yuan and Yongshuai Zhang and Xiping Guo",

note = "Publisher Copyright: {\textcopyright} 2021 Elsevier Ltd",

year = "2021",

month = jun,

doi = "10.1016/j.corsci.2021.109399",

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T1 - Microstructure characterization and hot corrosion mechanism of as-cast and heat treated high Nb containing TiAl alloy

AU - Sun, Zhiping

AU - Wu, Wenqing

AU - Chen, Yongnan

AU - Yuan, Zhanwei

AU - Zhang, Yongshuai

AU - Guo, Xiping

PY - 2021/6

Y1 - 2021/6

N2 - TiAl alloys possess broad development prospects in aerospace industry. To characterize hot corrosion behavior in service environment and provide comprehensive assessment of high Nb containing TiAl alloys, microstructure evolution and hot corrosion mechanism of them were focused. Ti-44Al-9Nb-0.5Si (TA1) and Ti-44Al-9Nb-0.5Si-0.3Y (TA2) solidified via β phase; β/α transformation took place after β solidification; α was finally deposed to α2+γ lamellae. Compared with TA1, TA2 had better hot corrosion resistance due to its finer lamellar structure. Based on Ti-Al-9Nb-0.5Si vertical section, heat treatment was conducted. After heat treatment, equiaxed γ grains, α2 grains and Ti5(Si,Al)3 precipitations appeared.

AB - TiAl alloys possess broad development prospects in aerospace industry. To characterize hot corrosion behavior in service environment and provide comprehensive assessment of high Nb containing TiAl alloys, microstructure evolution and hot corrosion mechanism of them were focused. Ti-44Al-9Nb-0.5Si (TA1) and Ti-44Al-9Nb-0.5Si-0.3Y (TA2) solidified via β phase; β/α transformation took place after β solidification; α was finally deposed to α2+γ lamellae. Compared with TA1, TA2 had better hot corrosion resistance due to its finer lamellar structure. Based on Ti-Al-9Nb-0.5Si vertical section, heat treatment was conducted. After heat treatment, equiaxed γ grains, α2 grains and Ti5(Si,Al)3 precipitations appeared.

KW - A. Alloy

KW - B. SEM

KW - B. Weight loss

KW - C. High temperature corrosion

KW - C. Hot corrosion

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DO - 10.1016/j.corsci.2021.109399

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SN - 0010-938X

VL - 185

JO - Corrosion Science

JF - Corrosion Science

M1 - 109399

ER -

Microstructure characterization and hot corrosion mechanism of as-cast and heat treated high Nb containing TiAl alloy

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