Nanocrystalline BCC solid solutions of Al---Fe---V system prepared by mechanical alloying

Solid state reactions in Al₅₀Fe₅₀, Al₅₀Fe₄₅V₅ and Al₅₀Fe₂₅V₂₅ powder mixtures by Mechanical Alloying (MA) and following annealing were studied. MA was performedin the high energy planetary ball mill in an argon atmosphere. X-ray diffraction (XRD) and Mossbauer spectroscopy (MS) methods were used. It was established that the partially ordered solid solution of B2 type has been formed in the Al₅₀Fe₅₀ alloy and the BCC (A2) phase has been formed in the V containing alloys. According to MS one can conclude that the short range order of B2 type in the mechanically alloyed Al₅₀Fe₄₅V₅ and Al₅₀Fe₂₅V₂₅ alloys was presented too. MA phases were characterized by a crystallite size of 10 nm. Annealing at 750 °C for 2h of mechanically alloyed Al₅₀Fe₅₀ and Al₅₀Fe₄₅V₅ resulted in the formation of completely ordered B2 phases. After annealing of the Al₅₀Fe₂₅V₂₅ alloy the A2 structure transformed in two phases — with B2 and D8_a structure.