Ball milling induced microstructure evolution in an FeMoSiB alloy with
three kinds of different phase constitutions (bcc alpha-Fe solid solu
tion and various borides) was investigated by means of X-ray diffracti
on and transmission electron microscopy. Experimental evidences indica
te that a same final product of bcc alpha-Fe solid solution was formed
upon milling for all samples. During the transformation, the XRD peak
s of alpha-Fe phase shift to lower diffraction angles; and those of bo
rides disappear in turn, first the metastable Fe3B and Fe23B6 and then
the stable Fe2B. The observed structure evolution might originate fro
m the transformation of ordered Fe2B phase into disordered alpha-Fe so
lid solution.