Calorimetric and mossbanuer studies of the nanocrystallized Fe_(90)Zr_7B_3 alloy

摘要

We have performed calorimetric analysis, X-ray diffraction and ~(57)Fe Mossbaueer spectrometry on Fe_(90)Zr_7B_3, a Nanoperm-type alloy. After isothermal annealing treatments with various times (from 100 to 10000s) and temperatures (from 753 to 823K), the transformed fraction has been obtained by using two DSC methods giving coherent results. X-rays diffraction patterns let to calculate an order of magnitude of the mean grain size, the lattice parameter of bcc #alpha# -Fe phase and the crystallized fraction for various annealed samples. Mossbauer spectrometry is able to evidence for the content of iron atoms lacated in crystalline grains, in the residual amorphous matrix, and in the interfacial region as well, thanks to its atomic sensitivity. The time and annealing temperature dependences of the crystallized fraction obtained from the three different techniques are consistent.