Microstructure and High Temperature Strength of Direct-Cast γ TiAl-Based Alloy Sheet

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  • Microstructure and High Temperature Strength of Direct-Cast γ TiAl-Based Alloy Sheet
  • Microstructure and High Temperature Str

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For the strengthening of TiAl-based alloys, direct sheet casting method with a CaO-coated Al2O3 crucible was employed to produce TiAl sheets. Fine alumina particles with 100–500 nm diameter are successfully distributed in the direct-cast TiAl sheet. This success is attributable to three factors: the first is the preserving of a certain oxygen content in the molten TiAl by a CaO-coated Al2O3 crucible, which is less reactive with TiAl than an Al2O3 crucible; the second is the distribution of alumina particles which did not coagulate because of the disturbance caused by induction; and the third is the rapid freezing of the matrix with dispersed alumina particles by direct casting. The direct-cast TiAl sheet, in which fine alumina particles are homogeneously distributed, shows much greater high-temperature ultimate tensile strength than that of conventional TiAl alloys: the 1273 K strength increases from 150 MPa to 360 MPa, and the 1373 K strength increases from 40 to 226 MPa. This strengthening is attributable to the solid solution hardening due to the insolution oxygen and the dispersion hardening of finely distributed alumina particles whose diameters are in the range of 100–500 nm. Since the alumina particles have such a fine diameter, the high temperature ductility of the direct-cast TiAl sheet does not show any significant reduction caused by the presence of inclusions, in contrast to SiC fiber-reinforced TiAl intermetallic compound composites.

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