Abstract
Powder mixtures of Fe and activated C containing 20, 50 and 75 at % Fe have been milled in vacuum for periods of up to 210 h. X-ray diffraction and Mössbauer effect measurements of the as-milled and annealed materials (500°C, 15 min) show the presence of γ-phase austenite (typically ∼10%) and the Fe 3C phase at different stages of the milling process in all samples, with the Fe 7C 3 phase also present in the milled Fe 50C 50 material. The behaviour of Fe-C (activated) milled in vacuum is found to be similar to that of Fe-C (graphite) milled in a gaseous atmosphere.
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