Properties of Phases in Mo–Fe–B Alloys with a Boron Content up to 40 at % after Annealing at Subsolidus Temperatures

The concentration dependences of the lattice parameter and microhardness HV of phases in Mo–Fe–B alloys annealed at subsolidus temperatures with a boron content of up to 40 at % have been plotted. It has been established that when the content of iron in the (Mo), (αδ-Fe), σ-MoFe, and Mo2FeB2 phases grows, the lattice parameter become smaller, but the microhardness increases for the (Mo) and Mo2FeB2 phases and decreases for the (αδ-Fe), σ-MoFe, μ-Mo6Fe7, and R-Mo2Fe3 phases. The obtained results are in good agreement with the boundaries of phase homogeneity regions on the earlier constructed solidus surface for most of the studied phases.