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The microstructural evolution of the β-NiAl/γ′-Ni 3 Al two-phase was investigated in (Ni 66 Al 34 ) 100−χ X χ (X=Ti, Si, Nb; χ=0–4at.%) alloys. Three different microstructures, such as lamellar, mesh and Widmanstätten, were obtained with the phase transformation procedure which depends on the A s (austenite start) temperatures and on the ternary elements...
The thermal stability of the lamellar microstructure in TiAl–Nb alloys containing Si and C has been investigated by partial melting experiments. The proper compositions, where the lamellar structure is stable enough to be used as a seed material are found for both TiAl–Nb–Si and TiAl–Nb–Si–C alloy systems. The lamellar microstructure of the Ti–44.5Al–3Nb–0.6Si–0.2C and Ti–45Al–2Nb–0.6Si–0.2C (at.%)...
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