Abstract AZ31/WE43 bimetal composites are prepared by insert molding method, and the microstructure evolution, phase constitution and bonding strength at the interface are investigated. A relatively uniform transition interface with a thickness of 50 to 150 μm is formed, indicating a good metallurgical bonding. The analysis shows the transition interface is mainly composed of lamellar-like and particulate Al2RE phase, particulate Al3Zr phase on AZ31 side, a precipitation free zone (PFZ) in the middle and quadrate-like Y-rich phases congregated together at the grain boundary close to WE43 side. The average interface shear strength is 108 MPa, which is much superior to other bimetal composites reported so far. The fracture analysis indicates that during the shear tests, the cracks initiates from the weak zone of casting AZ31 alloy. Aided by the interface microstructure, the mechanism on interface bonding is further discussed.

中文翻译：

---

嵌件成型法制备新型AZ31/WE43双金属复合材料的界面结合机理及力学性能

摘要 采用嵌件成型法制备了AZ31/WE43双金属复合材料，研究了界面处的微观结构演变、相组成和结合强度。形成厚度为50～150μm的相对均匀的过渡界面，表明冶金结合良好。分析表明，过渡界面主要由层状和颗粒状Al2RE相、AZ31侧的颗粒状Al3Zr相、中间的无析出区（PFZ）和在晶界附近聚集在一起的方形状富Y相组成。到 WE43 侧。平均界面剪切强度为 108 MPa，远优于目前报道的其他双金属复合材料。断裂分析表明，在剪切试验过程中，裂纹从铸造AZ31合金的薄弱区开始。