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首页> 外文期刊>Inorganic materials: applied research >Effect of Yttrium on the Structural-Phase State of the In Situ Mo-15.3 V-10.5 Si Composite
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Effect of Yttrium on the Structural-Phase State of the In Situ Mo-15.3 V-10.5 Si Composite

机译：Effect of Yttrium on the Structural-Phase State of the In Situ Mo-15.3 V-10.5 Si Composite

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摘要

By means of X-ray phase analysis and energy-dispersive X-ray analysis, the effect of yttrium on thestructural-phase state of the hypoeutectic Mo–15.3 V–10.5 Si alloy is investigated. It is established that themain phases of the Мо–(15.4–14.3) V–(10.6–9.8) Si–(0.3–5.3) Y alloys obtained under the conditions ofnonequilibrium solidification are the (Mo_(1-x)V_x)ss metal solid solution (matrix), (Mo_(1-x)V_x)3Si silicide solidsolution, and Y5Si3 silicide. In alloys doped with yttrium up to 1.0 at , the space between dendrites of the(Mo_(1-x)V_x)ss metal phase is filled with the (Mo_(1-x)V_x)3Si solid solution, and at the boundaries of the metalsolid solution, Y5Si3 is located. At the yttrium concentration of alloys higher than 3.0 at , space between the(Mo_(1-x)V_x)ss dendrites is filled with Y_5Si_3 silicide, inside which (Mo_(1-x)V_x)3Si grains are formed. No ternaryand quaternary yttrium-containing compounds are detected. The elemental composition of phases of theМо–(15.4–14.3) V–(10.6–9.8) Si–(0.3–5.3) Y alloys is almost identical and is characterized by silicon nonstoichiometry.The silicon content of the (Mo_(1-x)V_x)ss and (Mo_(1-x)V_x)_3Si phases lies within the accepted limitsof the homogeneity region, and the silicon concentration of Y_5Si_3 (≈35.4 at ) goes beyond the definedlimits. Doping the Мо–15.3 V–10.5 Si alloy with yttrium increases the degree of dispersion of the structure.Particles of the main structural constituents become close in size. At the same time, the volumetric ratio ofthe metal phase to the silicide phase increases as the yttrium content of the alloys is raised. The density of thealloys varies within 8.7 and 9.0 g/cm~3.

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