| 摘 要： | The solidification behavior of Ti-48Al-8Nb alloy under nonequilibrium solidification conditions was studied by electromagnetic levitation technique.The solidification conditions are different undercooling(△T)under the same cooling condition and different cooling methods at the same undercooling condition,respectively.In different undercooling conditions,when the undercooling is above a critical value(△T*≈211K),a remarkable morphological transition from typical hypoperitectic solidification to a sole solidification of the(3 phase resulting in the suppression of the peritectic reaction occurs.For melts with different cooling conditions at the same undercooling(△T≈85 K),the melt was rapidly cooled by quenching them in cooling media.With cooling rate increasing,a transition from β phase to peritectic α phase solidification mode is revealed for Ti-48Al-8Nb alloy.
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