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Figure 9
Metastable phase formation in undercooled Fe–Co alloys. (a) Part of the equilibrium Fe–Co phase diagram with metastable extension of the δ phase solidus and liquidus lines. Arrows indicate melt undercooling achieved during diffraction EML experiments in the Fe80Co20 (b) and Fe70Co30 (c) alloys. Temperature is synchronized in time with the corresponding evolution of the sample structure, depicted as the intensity contour plots of selected reflections. Formation of the b.c.c. structure during solidification of the Fe80Co20 alloy (b), not observed upon melting, confirms the metastable nature of the δm phase. In the course of solidification of the Fe70Co30 alloy the δm phase is not apparent at reduced time resolution used in (c). However, its formation during recalescence is captured in a spectrum acquired at 250 Hz, represented as a 3D contour plot of the main reflections in (d).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 33| Part 4| July 2026|
https://doi.org/10.1107/S1600577526003541
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