Structure and magnetic properties of mechanosynthesized iron-tungsten alloys

X-ray diffraction, Mossbauer spectroscopy and magnetization measurements were used to study the mechanical alloying processes in the Fe-W system. Two solid solutions of W in Fe lattice [Fe(W)] and Fe in W lattice [W(Fe)] were produced during the early stage of the mechanical alloying. The results are inconsistent with those obtained by the calculations of phase diagram (CALPHAD) method. It was assumed that Vegard law and simple dilution model were approximately realized in the Fe-rich and W-rich regions. On the basis of this assumption and Mossbauer measurements, Fe(W) solid solution was recognized as a ferromagnetic phase while W(Fe) solid solution as a paramagnetic one. Nearest neighborhood of Fe-57 atoms was determined using the hyperfine interactions parameters. (C) 2000 Elsevier Science B.V. All rights reserved.