Microstructure and properties of Fe Al composite material blended with tungsten concentrate powder prepared by laser combustion synthesis

Fe-Al alloy blended with different levels of tungsten concentrate powder was prepared by laser ignition induced self-propagating high-temperature synthesis (SHS). By means of the XRD, SEM, hardness test and abrasion test, the effect of the content of tungsten concentrate powder on the sintered alloy microstructure and macroscopic properties was studied. The experimental results show that through the sintering process, the self-propagating combustion synthesis of the blank was achieved. The structures of the sintered alloy are acicular, which grow up with the increase of the content of tungsten concentrate powder. The product phase of the sintering alloy are AlFe, AlFe₃, WO₃ and Fe₇W₆. When the mass fraction of the tungsten concentrate powder is 1%, the micro- hardness and the density of the sintering alloy are both the biggest, which are HK956 and 4.27 g/cm³ respectively, while the porosity and the relative wear rate of the sintering alloy are the lowest, which are 12.2% and 0.05% respectively.