Synthesis and characterization of nanocrystalline FeNiZrB developed by mechanical alloying

摘要

Mechanical alloying (MA) represents a non-expensive versatile route able to produce equilibrium as well as non-equilibrium materials including amorphous, nanostructured composites, and extended solid solution systems. In this work, two nanocrystalline alloys: Fe_(71)Ni_(14)Zr_6B_9 (A) and Fe_(60)Ni_(14)Zr_6B_(20) (B) were developed. The as milled (80 h) alloy consisted primarily of metastable BCC-(Fe, Ni) nanocrystals (6-10 nm). The apparent activation values obtained are 3.2 ±0.1 and 2.6 ± 0.1 eV for alloys A and B, respectively. The structural behaviour determined by X-ray diffraction and Mossbauer spectroscopy indicates that the thermally induced crystallization processes are related to the crystalline growth of the BCC-(Fe, Ni) phase and to formation of FCC-(Fe, Ni) and (Fe, Ni)_2-B phases.