Forming of tubes and bars of alumina/LY12 composites by liquid extrusion process
(1. College of Mechanical and Electrical Engineering,
Northwestern Polytechnical University, Xi＇an 710072，China;
2. College of Materials Science and Engineering, Northwestern Polytechnical University, Xi＇an 710072, China;
3. Department of Automatic Control,
Northwestern Polytechnical University, Xi＇an 710072, China)
Northwestern Polytechnical University, Xi＇an 710072，China;
2. College of Materials Science and Engineering, Northwestern Polytechnical University, Xi＇an 710072, China;
3. Department of Automatic Control,
Northwestern Polytechnical University, Xi＇an 710072, China)
Abstract: Tube and bar products of aluminum alloy composites reinforced by alumina short-fiber were formed in a single process with liquid extrusion technology. The microstructure verifies that the reinforcing effect is obvious in the deformation direction since fibers are distributed along this direction, which is resulted from the flow and crystallization under pressure of liquid metal and large plastic deformation of solidified metal in the process. The interface between fiber and matrix belongs to mechanical bonding. The fractograph demonstrates ductile mode. Liquid extrusion process opens up a new way for fabricating tube, bar and shaped products.
Key words: liquid metal extrusion; aluminum matrix composite; tube and bar