Microstructural evolution by friction stir processing in superplastic Zn-22wt%.Al alloy
- Hirata T. ,
- Tanaka T. ,
- Chung S.W. ,
- et al
- Hirata T. ,
- Tanaka T. ,
- Chung S.W. ,
- Takigawa Y. and
- Higashi K.
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The deformation behaviour and microstructural evolution of friction stir processed Zn, 22%Al rolled sheet (thickness 3 mm) were compared with those of the corresponding superplastic alloy. Friction stir processing was performed at a rotational speed of 1600 rpm and welding speed of 300 mm/min, with the welding direction parallel to the rolling direction. Deformation behaviour was characterised by room temperature, constant strain rate, tensile tests. Microstructure was observed by field emission SEM with electron backscatter diffraction. Nanoindentation tests were conducted to evaluate hardness and elastic modulus in each region. Issues discussed include grain boundary sliding, elongation-to-failure variation with strain rate, and the stress concentration accommodation mechanism.
7th International Symposium, 20-22 May 2008, 5B: Friction Stir Processing, Paper 03
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