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采用熔盐反应法制备了Al-5Zr中间合金并利用强碱腐蚀获得了初生Al_3Zr相的三维形貌,分析了Al_3Zr相的长大机理,研究了降温过程中浇注温度(1250、1050、950、800℃)对合金中初生Al_3Zr相三维形貌、尺寸及数量的影响,利用JMat Pro软件和面积法分别计算了Al-5Zr中间合金的理论固相率和实际固相率。结果表明:Al-5Zr中间合金中,Al_3Zr相的三维形貌呈现厚板状、薄片状、花瓣状及搭桥状等形貌,这些形貌的形成可以追溯到二维晶核和成分过冷综合作用机制。随着浇注温度降低,Al_3Zr相形貌由薄片状逐渐转化为厚板状,薄片相尺寸减小、数量减少;厚板相尺寸增大、数量增多,两种形貌相的总数量减少。利用JMat Pro软件计算的合金理论固相率与面积法计算的合金实际固相率基本吻合。从合金固相率看,随着浇注温度降低,厚板Al_3Zr相的相对含量增多。
The Al-5Zr master alloy was prepared by molten salt reaction and the three-dimensional morphology of primary Al 3Zr phase was obtained by alkali corrosion. The growth mechanism of Al 3 Zr phase was analyzed. The effects of pouring temperature (1250, 1050, 950, 800 ℃) on the three-dimensional morphology, size and amount of primary Al 3 Zr phase in alloy. The theoretical solid fraction and actual solid fraction of Al-5Zr master alloy were calculated by JMat Pro software and area method, respectively. The results show that the three-dimensional morphology of the Al 3 Zr phase in Al-5Zr master alloy exhibits the shape of plate, flake, petaloid and bridged. These morphologies can be traced back to the two-dimensional nucleation and compositional undercooling synthesis Mechanism. With the decrease of pouring temperature, the phase morphology of Al 3 Zr phase gradually changed from flake to plate shape, and the phase size decreased and the number decreased. The size of plate increased and the number of phases increased, and the total number of phases decreased. The theoretical solid fraction of the alloy calculated by JMat Pro software is basically consistent with the actual solid fraction calculated by the area method. From the alloy solid phase rate, with the pouring temperature decreases, the relative content of thick Al_3Zr phase increased.