Structure Changes in Fe-23 at.% Be Alloy

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Abstract
Structure changes in Fe-23 at.% Be alloy aged at temperatures between 300° and 800°C were studied by transmission electron microscopy. The structural changes with aging were classified depending on aging temperatures as follows: 1) 300° to 400°C; ordered structure, modulated structure, continuous precipitation of 1st metastable phase and discontinuous precipitation of 2nd metastable phase without grain boundary migration. 2) 500° to 800°C; continuous precipitation of 1st metastable phase in matrix, formation of discontinuously precipitated regions along boundaries, and continuous precipitation of stable phase in matrix. 3) Above 800°C; formation of dislocation networks, stable phase precipitation on them, and further formation of finer dislocation networks and precipitates. The structure of 1st metastable phase was f.c.c. and expected to be Laves phase of MgCu2 type. Variously shaped stable phase precipitates were Laves phase of MgZn2 type.

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