MICROSTRUCTURE AND PROPERTIES OF DEFORMABLE SiCP/Al COMPOSITE FABRICATED BY SQUEEZE CASTING METHOD
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摘要: 通过在SiC颗粒预制块中加入铝粉的方法制备了颗粒含量可控的SiC颗粒预制块,并用挤压铸造法制备了可变形SiCP/Al复合材料。通过对颗粒体积含量为25%的SiCP/Al复合材料进行热挤压变形,研究了挤压变形的可行性及其对复合材料组织与性能的影响规律。实验结果表明,用本文中提出的新工艺制备的25vol%SiCP/Al复合材料可以成功地进行挤压比为25∶1的热挤压变形,并且热挤压变形可以明显提高复合材料的强度、刚度和塑性。Abstract: A deformable SiCP/Al composite was fabricated by squeeze casting technique using an SiC particle preform with a controllable volume fraction which was made by adding aluminum powder into the preform. The deformability of the SiCP/Al composite was studied by hot extrusion and the effect of the hot extrusion on microstructure and properties of the composite was investigated. The results show that the 25vol% SiCP/Al composite fabricated by the modified squeeze casting method could be extruded successfully by an extrusion ratio of 25∶1, and the strength, modulus and tensile elongation were improved by the hot extrusion.
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Key words:
- silicon carbide particle /
- aluminum /
- composite /
- extrusion /
- squeeze casting
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