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

School of Materials Sience and Engineering

Chang'an University

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

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.

Original language	English
Article number	109399
Journal	Corrosion Science
Volume	185
DOIs	https://doi.org/10.1016/j.corsci.2021.109399
State	Published - Jun 2021

Keywords

A. Alloy
B. SEM
B. Weight loss
C. High temperature corrosion
C. Hot corrosion

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10.1016/j.corsci.2021.109399

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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",

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year = "2021",

month = jun,

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

language = "英语",

volume = "185",

journal = "Corrosion Science",

issn = "0010-938X",

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TY - JOUR

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

UR - http://www.scopus.com/inward/record.url?scp=85102873692&partnerID=8YFLogxK

U2 - 10.1016/j.corsci.2021.109399

DO - 10.1016/j.corsci.2021.109399

M3 - 文章

AN - SCOPUS:85102873692

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

Abstract

Keywords

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