MECHANICAL ALLOYING IN NANOSTRUCTURED Fe-Zn BINARY SYSTEM

摘要

Iron-zinc solid solution alloys were processed by mechanical alloying (MA) of high-purity metal powders. The MA-induced microstructural evolution was characterized using X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The nanostructured alloys maintained a single-phase, body-centered cubic (b.c.c.) lattice, with zinc content up to 65 at.%. Further additions of zinc, e.g. at 95 at.%, shifted the cubic lattice primarily to a hexagonal close-packed structure. An important feature of this binary system is that the bcc solid solutions formed by MA obey the Vegard's law. The effect of the addition of zinc on ferromagnetic properties was examined. The b.c.c. solid solutions remained ferromagnetic with the magnetic moment decreasing linearly with the increase of Zn concentration up to 55 at.%, consistent with the simple dilution law.