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采用热模金属型工艺,离心铸造Zn-27Al-9.8Mg-5.2Si和Zn-27Al-6.3Mg-3.7Si合金,获得了内层聚集大量块状初生Mg2Si、少量初生Si,中层不含初生Mg2Si、Si,外层含有初生Mg2Si、Si的自生表面复合材料.考察了成分、模具温度、转速、变质处理对离心铸造Zn-Al-Mg-Si合金组织和结构的影响.结果表明,Zn-27Al-9.8Mg-5.2Si合金自生复合材料内、外层的厚度比Zn-27Al-6.3Mg-3.7Si的厚度厚,初生Mg2Si的数量更多;随着转速增加,Zn-Al-6.3Mg-3.7Si合金自生复合材料的内层厚度增加,外层厚度减少;Na盐变质能够细化晶粒和初生Mg2Si,使初生Mg2Si分布更均匀,使初生Si团球化.最后分析了复合材料的成形过程.
Zn-27Al-9.8Mg-5.2Si and Zn-27Al-6.3Mg-3.7Si alloys were obtained by centrifugal casting, and a large amount of bulk primary Mg2Si and a small amount of primary Si were obtained in the inner layer and no primary Mg2Si in the middle , Si, the outer layer contains the primary Mg2Si, Si authigenic surface composites.The effects of composition, mold temperature, rotation speed and modification on the structure and microstructure of Zn-Al-Mg-Si alloy were investigated.The results show that Zn- The thickness of the inner and outer layers of -9.8Mg-5.2Si alloy is thicker than that of Zn-27Al-6.3Mg-3.7Si, and the amount of primary Mg2Si is more. With the increasing of the rotating speed, the content of Zn-Al-6.3Mg-3.7 Si alloy composites increased the thickness of the inner layer, the outer layer thickness decreased; Na salt metamorphism can refine the grains and primary Mg2Si, so that primary Mg2Si distribution more uniform, the primary Si group spheroidization.Finally analyzed the forming process .