Thermal stability and magnetic saturation of annealed nickel–tungsten and tungsten milled powders
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Abstract
Abstract Crystal structures, microstructures and magnetic saturation of annealed pure W powder along with W–40 wt.% Ni powder mixtures processed by high-energy ball milling were investigated using XRD, DTA, SEM and saturation magnetization techniques. Thermally induced transformations occurred at low temperature annealing. Supersaturated metastable Ni(W) solid solution formed during mechanical milling decomposed during annealing treatment into FCC Ni-rich, FCC W-rich phases and an eta-type phase which was constituted of BCC lattice of W enveloped by two FCC lattices of Ni and W. The structures of the major annealing products were close to Ni 10 W and W 3 Ni 2 . The magnetic saturation of the milled W powder and W–Ni mixtures decreased with the increase in annealing temperature. Milling time was more influential on the magnetic properties of the annealed pure W powders.
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