The composition design and properties investigation of Al-based amorphous powder

Abstract

By adding different amounts of rare earth element Y and Gd in Al86Ni8Co1La5, aluminum amorphous ribbon samples were prepared using single roller melt-spinning under 2 different roller speeds. Then X-ray diffraction (XRD), transmission electron microscope (TEM) and differential scanning calorimetry (DSC) were adopted to study the effect of rare earth element Y and Gd additions on phase structure, forming ability and thermal stability of Al86Ni8Co1La5 alloy. The results show that the better chemical composite is Al86Ni8Co1La1Y2Gd2, which can form a whole amorphous strip when the roller speed is 3 m/s. After the better chemical composition is confirmed, the Al-based amorphous powder is produced using gas atomization and its properties are also validated using cold spray technique. The thickness, porosity and amorphous amount of coatings is about 600 μm, 0.5% and 80.2% (CS–C), respectively. These findings indicate that Al86Ni8Co1La1Y2Gd2 amorphous powder can be used as raw materials for cold spray technique.