Deoxidation and alloying of magnetically hard alnico alloys with titanium and aluminium

The effect of deoxidation and alloying with aluminium and titanium on the alnico alloys has been studied by subjecting cast specimens and sprayed specimens to metallographic, X-ray diffraction and differential thermal analyses. The alloy was found to contain aluminium oxides, titanium oxides, titanium nitrides as well as complex oxides - Al2O3xTiO2. Addition of titanium enhances the crystal lattice of the alloy promoting oxygen solubility. However due to the changing oxygen, titanium and aluminium activity, the oxygen content in alnico alloy is reduced. Titanium inhibits the alpha-solid solution extending its range and increases the strength and hardness. The concentration of effective electrons of conductivity is not increased thereby but remains constant at 1.86x1021 cm-3