Open AccessFormation of nanocrystalline B2-structured (Fe,Ni)Al in mechanically alloyed Fe50Al30Ni20 (wt.%) powder
Author(s) -
Chafika Nakib
Publication year - 2018
Publication title -
new trends and issues proceedings on advances in pure and applied sciences
Language(s) - English
Resource type - Journals
ISSN - 2547-880X
DOI - 10.18844/gjapas.v0i9.3018
Subject(s) - materials science , nanocrystalline material , crystallite , scanning electron microscope , mössbauer spectroscopy , ternary operation , paramagnetism , powder diffraction , crystallography , metallurgy , dislocation , phase (matter) , solid solution , composite material , nanotechnology , chemistry , condensed matter physics , physics , organic chemistry , computer science , programming language
B2-structured (Fe,Ni)Al was synthesised by an abrupt reaction during mechanical alloying (MA) of the elemental powders of Fe, Al and Ni. The structural, microstructural, morphological and magnetic changes occurring in the studied material during MA were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Two crystalline phases were found, a majority one corresponding to (Fe,Ni)Al bcc phase with a crystallite size less than 10 nm, a lattice strain up to 1.6% and a dislocation density of about 2.3 x1016 m-2. The other phase was in a low proportion corresponding to Fe (Al,Ni) solid solution. SEM images showed an irregular morphology of powder particles. Mossbauer spectra of the milled powders, recorded at room temperature, reveal the paramagnetic behaviour of the obtained powder. Keywords: Mechanical alloying, ternary composition, dislocation density, structural properties, paramagnetic behaviour.