Abstract
Based on the study of the theory and practice of liquid forging and solid extrusion, liquid extrusion technology has been developed by combining the characteristics of both. By this technology, a tube, a bar, or other shapes can be produced in a single process, and the properties of many kinds of experimental materials are significantly improved. An Al-Si alloy has been used as an experimental material for studying the effect of the liquid extrusion process on casting alloys, and the properties and the microstructure of the alloy have been improved. Compared with permanent mold casting, the tensile strength is raised by 60%, the specific elongation is increased 15 times and impact resistance is increased even more. Correspondingly, the grain structure becomes finer and the silicon and AlFeMnSi phases are smaller. The strengthening mechanism of liquid extrusion has been expounded theoretically. A factor of 2 increase of strength by the liquid extrusion process has been described.
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