Abstract
Field-emission gun analytical transmission electron microscopy was used to study grain boundary precipitates in Fe–10Ni–7Mn (wt.%) maraging alloy after isothermal aging at 753 K. High spatial resolution energy dispersive X-ray spectroscopy was used for quantitative chemical analysis of the grain boundary precipitates. Precipitation of f.c.t. θ-NiMn intermetallic compound and reversion to f.c.c. austenite were identified at prior austenite grain boundaries after prolonged aging. Selected area electron diffraction patterns (SADPs) showed the L1 0 type ordering of f.c.t. θ-NiMn precipitates. The f.c.t. θ-NiMn precipitates showed higher Ni and Mn concentrations than reverted f.c.c. austenite.
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