Microstructure and mechanical properties of friction stir dissimilar welds of semisolid-casted AC4CH and 6061 aluminum alloy

The feasibility of friction stir welding to joining AC4CH semisolid cast aluminum alloy with 6061 plates was investigated, including the influence condition on mechanical properties joints. Excessive heat input conditions high tool rotational speed and low result in formation large burrs. Although hardness zone is scarcely affected by condition, as 1mm/s makes heat-affected zones both sides softer than zone. Better properties, such tensile strength approximately 85% base metal elongation exceeding basemetal, are obtained under conditions.