STRUCTURAL EVOLUTION OF AN FEMOSIB ALLOY DURING BALL-MILLING

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.