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采用直接水冷半连续铸造法制备 4045/3004/4045 铝合金三层复合锭坯。考察复合界面附近的温度场分布,并研究复合界面的宏观形貌、微观组织及界面两侧的成分分布。结果表明,在冷却板的作用下,界面附近形成一层具有一定厚度的半固态层,从而保证半连续铸造过程制备复合锭坯的顺利实现。两种合金在界面处较好地冶金结合在一起。界面力学性能测试结果表明,复合界面的抗拉强度和剪切强度分别为 105 和 88 MPa,这进一步证明了复合界面的结合是一种冶金结合。
Preparation of 4045/3004/4045 aluminum alloy three-layer composite billet by direct water-cooled semi-continuous casting method. The distribution of temperature field near the composite interface was investigated and the macroscopic morphology, microstructure and composition distribution of both sides of the interface were studied. The results show that a semi-solid layer with a certain thickness is formed near the interface under the action of the cooling plate to ensure the smooth realization of the composite billet during the semi-continuous casting process. Both alloys are metallurgically bonded together at the interface. The testing results of the interface mechanical properties show that the tensile strength and shear strength of the composite interface are 105 and 88 MPa respectively, which further proves that the combination of the composite interface is a metallurgical bond.