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Microstructural and fatigue crack growth behavior inhomogeneity of trace Sc added 7085 alloy friction stir welded joint
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  • Zixing Jia,
  • Lili Wei,
  • Hongfeng Huang,
  • Chongyu Liu,
  • Hongjie Jiang,
  • Xuda Xu
Zixing Jia
Guilin University of Technology
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Lili Wei
Guilin University of Technology
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Hongfeng Huang
Guilin University of Technology
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Chongyu Liu
Guilin University of Technology
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Hongjie Jiang
Guilin University of Technology
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Xuda Xu
Sanshui Fenglv Aluminium Co., Ltd.
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Abstract

The inhomogeneity of friction stir weld (FSW) joint of a 7085 Al-based alloy containing trace Sc was investigated by comparing the hardening phase morphology, grain structure, mechanical properties and fatigue crack growth (FCG) behavior in based metal (BM), heat-affected zone (HAZ) and weld nugget zone (WNZ). The results showed that microstructural evolution during FSW was remarkably affected by Sc addition. The recrystallization and growth of grains in BM and HAZ were restrained by coherent Al3(Sc,Zr) particles. In HAZ, partially dissolution and slight growth of precipitates resulted in softening but contributed to enhance the FCG resistance according to shear mechanism. In WNZ, high frictional heating and intense plastic deformation induced recrystallization and supersaturated solid solution which decomposed to form new reprecipitates, including many new GPII zones, ′ phases and some coarse equilibrium phases attached to grown incoherent Al3(Sc,Zr). Owing to combined influences of fine random orientated grain structure and reprecipitates, WNZ possessed the best fatigue endurance.

Peer review status:Published

11 Aug 2020Submitted to Fatigue & Fracture of Engineering Materials & Structures
12 Aug 2020Submission Checks Completed
12 Aug 2020Assigned to Editor
21 Aug 2020Reviewer(s) Assigned
28 Nov 2020Review(s) Completed, Editorial Evaluation Pending
02 Dec 2020Editorial Decision: Revise Minor
27 Dec 20201st Revision Received
28 Dec 2020Submission Checks Completed
28 Dec 2020Assigned to Editor
28 Dec 2020Reviewer(s) Assigned
09 Jan 2021Review(s) Completed, Editorial Evaluation Pending
22 Jan 2021Editorial Decision: Accept
May 2021Published in Fatigue & Fracture of Engineering Materials & Structures volume 44 issue 5 on pages 1257-1270. 10.1111/ffe.13427