Precipitation of nanometer-sized f.c.t. θ-NiMn intermetallic compounds was found to cause age hardening in a Fe-10Ni-7Mn (wt. %) maraging alloy during isothermal aging at 773 K. Conventional and high resolution transmission electron microscopy (TEM) was used to study microstructural characteristics of the f.c.t. θ-NiMn precipitates. Bright-field TEM images showed twinning of both fine matrix and coarse grain boundary precipitates. High resolution lattice imaging of the precipitates illustrated a nano-scale twinning of the precipitates. An atomistic model, corresponding to the lattice images, was developed for twinning reaction indicating the {111} and <111> as twin planes and directions, respectively.

Keywords: Maraging: Precipitation: NiMn: Twin

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