本文研究了 SiCw/Al 金属基复合材料的界面问题。用俄歇电子谱仪(AES)对断口表面和对它进行溅射剥层后分析的结果表明 SiC 晶须与基体 Al 结合良好。通过透射电镜和 X 射线能谱观测,没有发现界面反应层存在的迹象。分析表明既没有C、Si...本文研究了 SiCw/Al 金属基复合材料的界面问题。用俄歇电子谱仪(AES)对断口表面和对它进行溅射剥层后分析的结果表明 SiC 晶须与基体 Al 结合良好。通过透射电镜和 X 射线能谱观测,没有发现界面反应层存在的迹象。分析表明既没有C、Si 元素通过界面向基体中的扩散,也没有 Al 通过界面向晶须中的扩散。X 射线衍射试验结果进一步证实了这一点。研究还表明 SiC 晶须与其周围的 Al 基体可能存在某种位向关系。展开更多
2024Al based composites reinforced by a hybrid of SiC whisker and SiC nanoparticle were fabricated by a squeeze casting route. In the (SiCw+SiCp)/Al composites, the volume fraction of SiC whisker is 20% and that of Si...2024Al based composites reinforced by a hybrid of SiC whisker and SiC nanoparticle were fabricated by a squeeze casting route. In the (SiCw+SiCp)/Al composites, the volume fraction of SiC whisker is 20% and that of SiC nanoparticle is 2%, 5% and 7%, respectively. The as cast composites were solution treated followed by aging treatment. The experimental results show that the SiC nanoparticles are more effective in improving the hardness and tensile strength of the composites than SiC whiskers. The hardening kinetics of the composites is enhanced by reinforcements addition and the peak aging time is 4-5 h. The hardness of all the hybrid composite decreases at the initial aging stage, suggesting that dislocation recovery softening process coexists with precipitation hardening. DSC study shows that the GP zone formation of the hybrid composites is suppressed.展开更多
文摘本文研究了 SiCw/Al 金属基复合材料的界面问题。用俄歇电子谱仪(AES)对断口表面和对它进行溅射剥层后分析的结果表明 SiC 晶须与基体 Al 结合良好。通过透射电镜和 X 射线能谱观测,没有发现界面反应层存在的迹象。分析表明既没有C、Si 元素通过界面向基体中的扩散,也没有 Al 通过界面向晶须中的扩散。X 射线衍射试验结果进一步证实了这一点。研究还表明 SiC 晶须与其周围的 Al 基体可能存在某种位向关系。
基金Project(50071018) supported by the National Natural Science Foundation of China
文摘2024Al based composites reinforced by a hybrid of SiC whisker and SiC nanoparticle were fabricated by a squeeze casting route. In the (SiCw+SiCp)/Al composites, the volume fraction of SiC whisker is 20% and that of SiC nanoparticle is 2%, 5% and 7%, respectively. The as cast composites were solution treated followed by aging treatment. The experimental results show that the SiC nanoparticles are more effective in improving the hardness and tensile strength of the composites than SiC whiskers. The hardening kinetics of the composites is enhanced by reinforcements addition and the peak aging time is 4-5 h. The hardness of all the hybrid composite decreases at the initial aging stage, suggesting that dislocation recovery softening process coexists with precipitation hardening. DSC study shows that the GP zone formation of the hybrid composites is suppressed.
