Influence of two-step aging on structure and stress corrosion sensitivity of friction stir welded 7050-T7451 aluminum alloys

ZHANG Hua; GUO Qilong; ZHAO Changyu; LIN Sanbao; SHI Gongqi

doi:10.12073/j.hjxb.20190513001

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2020 > 41(6): 1-5. > DOI: 10.12073/j.hjxb.20190513001

ZHANG Hua, GUO Qilong, ZHAO Changyu, LIN Sanbao, SHI Gongqi. Influence of two-step aging on structure and stress corrosion sensitivity of friction stir welded 7050-T7451 aluminum alloys[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2020, 41(6): 1-5. DOI: 10.12073/j.hjxb.20190513001

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Influence of two-step aging on structure and stress corrosion sensitivity of friction stir welded 7050-T7451 aluminum alloys

1.
Beijing Institute of Petrochemical Technology, Beijing, 102617, China
2.
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China
3.
The Welding Institute, Cambridge, CB21 6AL, UK

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Received Date: May 12, 2019
Available Online: September 26, 2020

Graphical Abstract

Abstract

Abstract

3 mm thick 7050-T7451aluminum alloy joint was obtained by friction stir welding, and the two-stage aging treatment was performed at 121 ℃ × 5 h + 163 ℃ × 27 h after welding. Microstructure, hardness profiles and stress corrosion sensitivity of the joint were measured and studied. The results indicate that through the two-step aging, the grain size is coarsened, the age-hardening precipitates and PFZ become wider at the same time, which results in the discontinuous grain boundary; the microhardness of the FSW joints decreased, but the heat-affected zone significantly narrowed, which increased the uniformity of the microhardness of the FSW joints; and the two-stage aging effectively reduced the stress corrosion sensitivity of the FSW joints. The joints with aging treatment were not broken after 60 days, however all the joints without aging treatment were broken within 1 day.
- 7050 aluminum alloy,
- friction stir welding,
- two-step aging,
- stress corrosion sensitivity

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References (18)

References

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Influence of two-step aging on structure and stress corrosion sensitivity of friction stir welded 7050-T7451 aluminum alloys