抄録
Mg-Si alloy have high potential as heat resistant light metals because Mg_2Si exhibits a high melting temperature, low density, low thermal expansion coefficient and a reasonably high elastic modulus. On the other hand, the microstructural refinement serves the important of mechanical properties. In this work, magnesium alloy powder refined the grains was produced by roll compaction (RCP) process. And Bio-silica^[○!R] was used to synthesized Mg_2Si and MgO by reaction with magnesium alloy, and Mg_2Si/MgO/Mg composites were produced. The Bio-silica^[○!R] was high purity SiO_2 made from rice husk ash. It shows a good mechanical property could be fabricated by hot extrusion using a mixture of magnesium alloy powder and Bio-silica^[○!R].
