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采用离心铸造技术制备了 Si Cp/ Al- 8.8% Si合金梯度材料 ,并用扫描电子显微镜、HV- 5型小负荷维氏硬度计和ML- 10 0型销 -盘磨粒磨损试验机等设备研究了该梯度材料组织、硬度及耐磨性的梯度分布规律 .结果表明 :因 Si C颗粒的密度比铝合金液的大 ,其在离心力场中偏聚于试样的外侧 ,含量由外向内逐渐降低直至消失 ,呈梯度变化 ;Si Cp/Al- 8.8% Si合金梯度材料的硬度由外向内逐渐降低 ,呈梯度变化 ,与 Si C颗粒的分布规律一致 ;Si Cp/ Al- 8.8% Si合金梯度材料的耐磨性能取决于 Si C颗粒的数量及其分布 ,耐磨性能由外向内逐渐变差 ,呈梯度变化 ,与硬度的分布规律一致
The Si Cp / Al- 8.8% Si alloy gradient materials were prepared by centrifugal casting technology and studied by scanning electron microscopy, HV-5 Vickers hardness tester and ML-10 0 pin-disc abrasive wear tester The gradient distribution of microstructure, hardness and wear resistance of the graded material was studied.The results show that due to the density of Si C particles is larger than that of aluminum alloy liquid, it is segregated to the outside of the sample in the centrifugal field and the content gradually increases from the outside to the inside The hardness of the Si Cp / Al-8.8% Si alloy gradient material gradually decreases from the outside to the inside and changes with the gradient, which is consistent with the distribution of Si C particles. The Si Cp / Al- 8.8% Si alloy gradient The wear resistance of the material depends on the amount of Si C particles and their distribution, and the wear resistance deteriorates gradually from the outside to the inside, changes in a gradient, consistent with the distribution of hardness