Structure and corrosion behavior of friction stir weld joint of 2195 Al-Li alloy

MA Yunlong; YANG Ziqi; LI Jinfeng

doi:10.12073/j.hjxb.2019400276

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2019 > 40(10): 142-147. > DOI: 10.12073/j.hjxb.2019400276

MA Yunlong, YANG Ziqi, LI Jinfeng. Structure and corrosion behavior of friction stir weld joint of 2195 Al-Li alloy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(10): 142-147. DOI: 10.12073/j.hjxb.2019400276

Citation:

Structure and corrosion behavior of friction stir weld joint of 2195 Al-Li alloy

MA Yunlong^{1, 2,},
YANG Ziqi¹,
LI Jinfeng^1, ,

1.
Central South University, Changsha 410083, China
2.
Beijing Institute of Aerospace Systems Engineering, Beijing 100076, China

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Received Date: April 03, 2018
Available Online: July 12, 2020

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Abstract

Abstract

Microstructures, electrochemical behavior and corrosion feature of different locations in 2195-T8 Al-Li alloy FSW joint were investigated. The parent metal possesses fiber-like grains, but the nugget zone is featured with fully recrystallized grains with size less than 10 μm. The strengthening precipitates of the parent metal are T1 (Al₂CuLi) and θ' (Al₂Cu). In the thermo-mechanically affected zone, most T1 and all θ' are re-dissolved, but all T1 and θ' are re-dissolved in the nugget zone. From the parent metal to the nugget zone, the potential increases. Accordingly, galvanic corrosion occurs on the FSW joint surface, the parent metal undertakes anodic current and the nugget zone undertakes cathodic current. In the intergranular corrosion medium, superficial corrosion occurs on the nugget zone surface, but corrosion penetrates inside the parent metal.
- Al-Li alloy,
- friction stir weld,
- microstructure,
- corrosion,
- electrochemical behavior

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References (18)

References

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Structure and corrosion behavior of friction stir weld joint of 2195 Al-Li alloy