Microstructure Evolution in the Mushy Zone of a β‐Solidifying TiAl Alloy under Different Cooling Processes
作者： Jieren Yang , Bao Xiao , Peng Han , Hongchao Kou , Jinshan Li
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摘要: A novel method termed mushy zone cooling control is applied to tailor the microstructure of a β-solidifying titanium aluminide alloy in this study. Ti-44.5Al–4Nb–2Cr–0.1B (at%) subjected temperature-controlled through by different processes. The solidified consists α2/γ lamellar colony, B2 phase, and massive γ. It found that both fast thermal cycling can play role refining colonies reducing which brittle at room temperature. with an average size 28 µm are obtained after 10 cycles. results also show solidification microsegregation be largely eliminated cooling. However, will continuously coarsen during such isothermal holding process.
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