Effect of second phase dispersion by friction stir processing on cast Mg alloys
- Morishige T. ,
- Tsujikawa M. ,
- Hino M. ,
- et al
- Morishige T. ,
- Tsujikawa M. ,
- Hino M. ,
- Oki S. ,
- Hirata T. and
- Higashi K.
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The microstructures and strengthening mechanisms during friction stir processing (FSP) of AZ91 (Mg, 9%Al, 1%Zn) die-cast and Mg-Y-Zn (Mg, 5.9%Y, 2.6%Zn and Mg, 5.5%Y, 4.3%Zn) cast alloys were investigated and the effect of second phase particle dispersion on grain refinement level and hardness in the stir zone was examined. Single-run FSP and lap friction stir welding experiments were conducted using a shouldered tool. Microstructure was observed by optical microscopy and field emission SEM, grain sizes were measured by the linear intercept method. Hardness of parent material and stir zone was determined using a micro-Vickers hardness tester and phase identification was performed by x-ray diffraction. The Hall-Petch relationship between grain size and hardness is discussed.
7th International Symposium, 20-22 May 2008, 4B: Non Ferrous, Paper 04
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