新型离心铸造自生梯度/表面复合材料的研究

The effects of composition, technological parameter including pouring temperature, mold temperature, and rotating rate etc. on microstructures, primary phase distribution of centrifugally cast Zn-27Al-Si alloys and Zn-27Al-xMg-ySi alloys have been studied. In situ composites have been fabricated by respectively centrifugal casting Zn-27Al-Si and Zn-27Al-xMg-ySi alloys using the heated permanent mold. For Zn-27Al-Si alloys, the composites are consisted of three layers, inner layer segregates lots of primary silicon, middle layer contains eutectic microstructure, and outer layer contains a litter primary silicon. For Zn-27Al-xMg-ySi alloys, the composites are consisted of three layers, inner layer segregates lots of blocky primary Mg2Si and a little blocky primary Si, middle layer contains without primary Mg2Si and primary Si, outer layer contains primary Mg2Si and primary Si. The microstructure and in situ composites forming process have been studied, and the phase, element distribution, microstructure, strength, hardness distribution, wear ability, and fracture characterization of the composites have been analyzed. Moreover, The Al13Fe4 growth during the solidification of hypereutectic Al-Fe ally has been studied by decantation during centrifugal casting

采用离心铸造技术，选择适当的锌基多元合金，依靠初生增强相内浮或一种初生增强相内浮，另一种初生相外沉制备新型的自生梯度/表面复合材料．研究工艺参数与复合材料组织的叵? 实测和数值计算初生相的分布，优化复合材料的制备方法和工艺，研究复合材料的形成机理，组织结构和性能。对开拓离心铸造自生复合材料的研究和应用领域具有重要意义