Investigation into the structure and phase composition of powder aluminum-phosphorus master alloys

Powder aluminum-phosphorus master alloys for modifying hypereutectic silumins are developed. Optimal treatment modes of powder mixtures in a high-energy planetary mill which give minimal losses of the starting material and the microstructure with the uniform and dispersed distribution of particles of excess phases in the aluminum matrix are selected. The phase composition of formed master alloys is investigated by electron probe microanalysis. The high efficiency of modifying the hypereutectic silumin Al-17 wt % Si by introducing phosphorus (0.008 wt %) using fabricated master alloys is shown.