Microstructural evolution and growth behavior of intermetallic compounds at the liquid Al/solid Fe interface by synchrotron X-ray radiography

摘要

The growth of Inter-Metallic Compounds (IMCs) with dissolution was investigated on the liquid Al/solid Fe interconnection by using synchrotron radiation real-time imaging technology. At the initial stage of holding at 850 degrees C, a layer of the eta-Fe2Al5 phase formed at the interface, and tongue-like eta grew into alpha-Fe. The tongue-like eta phase had a stronger (001) texture than the layered phase. The coalescence of tongue-like eta started at the bottom, followed by the dissolution of IMC5, which leads to a further increase in its growth rate. During solidification stage, the dotted, needle-like and flake theta-FeAl3 phases were sequentially formed.