Abstract
The microstructure of Fe 79.7‐x Mn x B 20 Nb 0.3 glassy ribbons has been investigated using transmission electron microscopy (TEM) and energy dispersive X‐ray spectroscopy (EDX), for manganese concentrations of x=12, 16 and 20. For each manganese concentration the ribbon is found to consist of nanocrystalline inclusions in an amorphous matrix. Through detailed analysis of electron diffraction patterns and in conjunction with JEMS simulation, the crystalline phase is shown to be manganese diboride (MnB 2 ), and high resolution TEM investigation confirms this. Using dark‐field TEM, the mean size of the nanocrystalline inclusions as well as their phase fraction are measured and found to increase with manganese concentration. EDX mapping shows the tendency for manganese to form nano‐scale clusters in agreement with the dark‐field investigation. This research was supported by the European Commission FP7‐REGPOT‐2012‐2013‐1, Grant Agreement no. 316194 NANOSENS.
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