(哈尔滨工业大学材料科学与工程学院，哈尔滨 150001)
摘 要: 研究了SiCw/L3复合材料固相区和液-固两相区挤压行为，提出了包覆挤压方法 。通过SEM、图象分析和拉伸性能测试，对铸态和挤压态SiCw/L3复合材料的组织和性能进行了观察、分析和测定。结果表明，液-固两相区挤压虽然有效地减轻了晶须折断程度，却造成了挤压棒表面质量的恶化；液-固两相区包覆挤压既有效地减轻了晶须折断程度，又保证了挤压棒的表面质量。与固态挤压相比，液-固两相区包覆挤压的挤压棒强度进一步提高和塑性大幅度下降，可归因于晶须折断程度减轻。
关键字: 铝基复合材料 液固两相区 包覆挤压 组织 性能
（School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001, P. R. China）
Abstract:The extrusion behavior of SiCw/L3 composite in the liquid-solid two phase region as well as the solid phase region was studied. A process of clad extrusion is presented. Experiments on the microstructure and properties of both as-cast and as-extruded composites were conducted by SEM, graph-analyzer and tensile tests. Results showed that although the extrusion in liquid-solid two-phase region helps decrease the breakage degree of whiskers effectively, the surface quality of corresponding extruded bars becomes worse; clad extrusion in liquid-solid two phase region not only decreases the breakage degree of whiskers effectively, but also guarantees the surface quality. In comparison with solid phase extrusion, the strength of extruded bars after clad extrusion in liquid-solid two phase region increases to a certain degree and the plasticity decreases greatly. This phenomenon may be explained by the decrease in the breakage degree of whiskers.
Key words: aluminium matrix composite liquid-solid two phase region clad extrusion microstructure mechanical properties
