Abstract
Hardness and crash tests on Al-10%Cu alloys having a variety of primary structure in the solid-liquid state at elevated temperatures were carried out to estimate the structure preferable to thixo-castings using an apparatus newly developed. Rheocastings having structures further refined and those having granular primary structures in place of usual dendritic structures have softness to a greater degree in the crash test notwithstanding equal static hardness. The fraction of granular structures in the whole fraction solid has a great infiuence on mechanical properties of the alloy slurry.
