Mechanical alloying of Fe_(100-x-y)Nb_xB_y (x = 5,10; y = 10,15): From pure powder mixture to amorphous phase

摘要

The mechanical alloying process of Fe_(75)Nb_(10)B_(15) and Fe_(85)Nb_5B_(10) systems has been studied from an initial mixture of elemental powders. The amorphization process is monitored by X-ray diffraction and Mossbauer spectrometry. An amorphous phase is formed after 400 h milling only for Fe_(75)Nb_(10)B_(15) alloy, whereas a bcc supersatured solid solution is the final product after milling Fe_(85)Nb_5B_(10) alloy. For both cases a dispersion of approx 10 percent in the Fe content of the powder particles persists after 400 h milling. Powder particle size, Cr content and lattice parameter of bcc phase are larger for the alloy with the highest Nb content.