The structural stability of the fibrous Fe–Fe2B eutectic has been examined isothermally at 1373K (1100° C), 1223K (950° C), and 1073K (800° C) and under repeated thermal cycling across the α-Fe ⇌ γ-Fe transformation, which occurs at ∼ 1183K (910° C). Unlike other eutectic systems, rapid degradation of the microstructure was observed both on longitudinal and transverse sections. The manner of coarsening was followed using quantitative metallographic techniques and the rate-controlling mechanism for the coarsening process was shown to be the self-diffusion of iron.
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