Abstract
A series of six Fe-Zn-Si alloys was investigated with Fe content varying through the range 5.60 to 25.37 wt.% and fixed Si content of 0.12 wt.%. These alloys were formed by mechanical alloying of pure elemental powders—specifically by ball milling. After preparation, uniformity of microstructure was verified by electron microscopy and microprobe analysis. Annealing progress was followed by DSC and XRD. Differential scanning calorimetry measurements through the range 200 to 600 ‡C were used to locate the temperatures of relaxation phenomenon and the structural evolution. X-ray diffraction patterns were used to identify the phases present at various stages of the evolution. An invariant reaction was found near 423 ‡C and was identified as the peritectic melting of Zn. Identification of the formation of FeSi in a broad composition range below 9.1 wt.% Fe and at temperatures through 400 ‡C suggests the existence of phase field change. The formation of this FeSi phase is suggested as a possible cause for the Sandelin effect.
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