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| Microstructures and Mechanical Properties of Al-Li Alloy Friction Stir Weld |
| WANG Dayong; FENG Jicai; WANG Panfeng |
| State Key Laboratory of Advanced Welding Production Technology; Harbin Institute of Technology; Harbin 150001 |
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Cite this article:
WANG Dayong; FENG Jicai; WANG Panfeng. Microstructures and Mechanical Properties of Al-Li Alloy Friction Stir Weld. Acta Metall Sin, 2004, 40(5): 504-508 .
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Abstract Friction stir welding (FSW) for 5 mm thick Al-Li alloy rolled sheet
material has been
completed with a cone-shape screw thread pin.
The metallurgy experiment demonstrates that
the dynamic recrystallization occurs in the weld nugget zone (WNZ),
fine equiaxed grains form, and a large number of segregation phases
appears at grain boundaries. The
microstructure in the heat--affected zone (HAZ) consists
of coarse bar-shape recovery grain,
and that of the thermo-mechanically affected zone (TMAZ)
exhibits bent band-like character, but the deformation degree
at the advancing side is bigger than that at the retreating side. Microstructures in TMAZ
are also recovered, and the amount of
recovery grain at retreating side is more than that at advancing side.
Tensile test shows that the joint strength
and elongation are 345 MPa at welding rate v=40 mm/min, and
9.6% at v=60 mm/min respectively. Hardness
measurement shows that the FSW joint is soften
during welding, and the softened zone at
advancing side is wider than that at retreating
side. Fractographs confirm that the fracture
of the joint is mixed mode of ductile and brittle fracture.
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Received: 15 July 2003
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