Isamu Yamauchi1, Itsuo Ohnaka1, Satoru Kawamoto2 and Tatsuichi Fukusako1
1Department of Metallurgical Engineering, Faculty of Engineering, Osaka University, Suita
Rapidly solidified Al-Si alloy powders containing Si from 7.1% to 23.7% produced by the Rotating-Water-Atomization Process was hot-extruded and the mechanical properties were examined. The results are summarized as follows:
(1) Rapidly solidified powders were easily extruded at 593 K and 673 K without blister, and its surface quality was smoother, especially for higher Si alloys, than that of the cast material similarly extruded.
(2) Si particles were precipitated and grew during the hot extrusion and their size depended on the extrusion temperature.
(3) The tensile strength and hardness were much higher than the cast and extruded material without remarkable loss of elongation. Finely dispersed Si was evidently very effective in improving the tensile strength of Al-Si alloy powder extrusion. The tensile strength of Al-23.7%Si extruded at 593 K was about 360 MPa and its elongation was about 5%. The strength increased with decreasing extrusion temperature.
atomization, aluminum-silicon, powder, rapid solidification, extrusion, mechanical property, process
Please do not copy without permission.