Chemical heterogeneity of dendrites in nickel alloys
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The character of dendritic heterogeneity is due not only to the shape of the phase diagram in the liquidus and solidus regions but also to the transformations in the solid state. In alloys corresponding to the binary region liquation is determined by the composition of the excess phase.
Chromium and molybdenum in single phase alloys of Ni−Cr−Mo and Ni−Cr−Al−Mo undergo liquation in interaxial areas of the dendrites. The degree of liquation increases when the alloy contains tungsten.
In KhN73MT, KhN72MTYu, and KhN67VMTYu alloys the character of the liquation of chromium and molybdenum is different. They are pushed into the axes of dendrites.
Tungsten in the Ni−W, Ni−Cr−W, and Ni−Cr−Mo−W single phase alloys is liquated in the axes of dendrites. In a binary alloy containing titanium (KhN67VMTYu) the interaxial areas of dendrites rich in the γ′-phase are additionally impoverished in tungsten (down to 1%, when its concentration in the batch is 5%).
In alloys with a nickel-chromium base, aluminum is distributed uniformly if its concentration does not exceed 1%.
KeywordsAluminum Titanium Nickel Chromium Phase Diagram
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