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本实验对晶须体积含量(V_f)为14％的SiC晶须增强6061铝合金复合材料(SiC/Al)在高温下直接进行了轧制变形,最大变形量达65％。拉伸实验结果表明,轧制后材料的强度和塑性均有很大改善。在扫描电镜下观察到轧制后晶须发生了明显的取向。透射电镜分析结果表明基体中有较高密度的位错,另外还观察到了晶须折断现象。通过理论分析和实验验证,得到交叉轧制有利于变形过程中晶须的转动,从而能得到最大的轧制变形量。
In this experiment, SiC whisker reinforced 6061 aluminum alloy composites (SiC / Al) with 14% whisker volume fraction (V_f) were directly rolled and deformed at high temperature with a maximum deformation of 65%. Tensile test results show that the strength and ductility of the material after rolling have greatly improved. A clear orientation of the whiskers after rolling was observed under a scanning electron microscope. Transmission electron microscopy analysis showed that there was a higher density of dislocations in the matrix, and in addition, whisker breakage was observed. Through theoretical analysis and experimental verification, it is found that cross-rolling is beneficial to the rotation of whiskers in the deformation process, so that the maximum amount of rolling deformation can be obtained.