A preparation method of γ-tial alloy with preferential orientation of lamellar interface and fine lamellar characteristics
A preferred orientation and interface technology, applied in the field of TiAl intermetallic compounds, can solve problems such as insufficient high temperature performance and poor room temperature plasticity
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[0032]In this embodiment, the selected alloy composition is Ti-48Al-2Cr-2Nb (at%), and its primary phase is α; the selected metal mold 10 is a thick-walled steel mold without preheating, and the cavity of the metal mold 10 is Plate-like, with the largest temperature gradient in its thickness direction, and satisfying In the formula, G is the actual temperature gradient in the liquid phase at the front of the solid-liquid interface (K / μm), R is the crystal growth rate (the advancing speed of the solid-liquid interface into the liquid phase) (μm / s), and m is the phase diagram Slope of the upper liquidus (dimensionless), c 0 is the solute content (%), k 0 is the solute partition coefficient (dimensionless), and D is the diffusion coefficient of the solute in the liquid phase (μm 2 / s). Since the primary phase of Ti-48Al-2Cr-2Nb is α, the α phase preferentially grows along the [0001] direction in the thickness direction, forming a neat and long α columnar crystal; the lamellar...
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