The Effect of Ti Addition on Microstructure and Magnetic Properties of Nanocrystalline FeAl 40 Alloy Powders Prepared by
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THE EFFECT OF Ti ADDITION ON MICROSTRUCTURE AND MAGNETIC PROPERTIES OF NANOCRYSTALLINE FeAl40 ALLOY POWDERS PREPARED BY MECHANICAL ALLOYING Nadia Metidji,1,2,5 Nacer Eddine Bacha,1 Abderrahmane Younes,3 and Djaffar Saidi4 UDC 669.1’669.715+676.017.58 Recent research on nanocrystalline FeAl alloys has shown that these alloys are of high importance due to their promising structural and mechanical properties, particularly magnetic behavior. This work aims at studying the synthesis, structural and magnetic characterization of nanocrystalline FeAl alloy powders, prepared by a mechanical alloying process (MA), as well as the effect of Ti addition on the magnetic properties of a compound. The powder morphology, phase transformation, crystallite size, micro-stress evolution, and magnetic properties were investigated by X-ray diffraction (XRD), scanning electronic microscopy (SEM), and vibrating samples magnetometer (VSM). It has been found that at the final stage of mechanical alloying the bcc-disordered FeAl phase and nanocrystalline Fe(Al, Ti) solid solution occurred for the FeAl40 and FeAl40Ti3 alloys, respectively. The milling time and the addition of titanium affect the powder morphology and decrease the size of the particles. The average crystallites size of 17.2 and 11.2 nm was reached at the end of 30 h of milling, and the lattice strain increased up to 0.3 and 0.21% for the FeAl40 and FeAl40Ti3 alloys, respectively. Also, the magnetic properties attributed to microstructural changes were investigated. It has been established that the change in magnetic behavior occurs mainly due to the formation of a supersaturated Fe(Al, Ti) solid solution. Magnetic properties of the samples are highly influenced by the addition of the Ti element into FeAl40 alloy, as well. The magnetism of the FeAl40Ti3 compound is reported to be higher than that of FeAl40. Keywords: mechanical alloying, nanocrystalline materials, lattice strain, crystallite size, magnetic behavior.
INTRODUCTION The nanocrystalline materials have a wide interest in recent years due to their unique structural and mechanical properties, which in particular include: elasticity, crystallite size, hardness, and magnetic behavior [1, 2]. Among enhanced properties of the nanostructured powders is its grain size, which is typically less than 100 nm.
1Laboratory
of Surface Treatment & Materials University of Saad Dahleb Blida, Algeria. 2Unité de Développement des Equipements Solaires, UDES/Centre de Développement des Energies Renouvelables, CDER, Bou Ismail, 42415, W. Tipaza, Algeria. 3Research Center in Industrial Technologies (CRTI), P.O.Box 64,Cheraga 16014, Algiers, Algeria. 4Nuclear Research Center, Draria, 16050, Algiers, Algeria. 5To
whom correspondence should be addressed; e-mail: [email protected].
Published in Poroshkova Metallurgiya, Vol. 59, Nos. 3–4 (532), pp. 55–68, 2020. Original article submitted June 18, 2019. 160
1068-1302/20/0304-0160 2020 Springer Science+Business Media, LLC
For the synthesis of fine crystalline grains, different techniq
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