Abstract
Aluminium alloy materials prepared by rapidly solidification process are expanding applications with their superior properties such as lightness, strength and wear resistance. In this prospective field, spray forming (SF) is now a matter of the special interest because of its simpler process, lower cost and lower oxygen content in products.
In this experiment, we prepared three SF preforms of Al-Si alloy sprayed with various "gas to metal (G/M) ratio". The microstructure and mechanical properties of the preforms and extruded materials were investigated, and found to be controled by G/M ratio. The increase of G/14 ratio reduces primary Si size and hence lowers wear resistance. On the contrary, strength of the extruded materials increases with G/M ratio.
