Abstract
The phase and chemical composition of an MoSi system alloy with a silicon content of 25 at.% was investigated via scanning electron microscopy, X-ray microanalysis, and X-ray diffraction. The samples were obtained by both sintering and melting of the components. The synthesis of Mo3Si from elemental Mo and Si via a sintering process at ≤1480 °C was significantly less complete than the synthesis of MoSi2, Mo5Si3 silicides via same process. To increase the efficiency of the synthesis, the reaction sintering of Mo3Si should be carried out at significantly higher temperatures than in the cases of MoSi2 and Mo5Si3 silicides synthesis. This offers a sufficiently phase-pure Mo3Si via reaction sintering at temperatures below the solidus. X-ray microanalysis data on Mo3Si chemical composition indicated a Mo3Si exists in a small compositional range. The average silicon content in Mo3Si was <25 at.%. In addition, experimental data indicated that the solubility of silicon in molybdenum may be higher than previously thought. Furthermore, the composition of the melt-quenched samples suggests that the solidus line for a Si solution in Mo may be retrograde.
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