Structural characterisation of the mechanically alloyed Fe₅₇Co₂₁Nb₇B₁₅ powders
by Safia Alleg, Saida Souilah, Rachid Bensalem, Achour Younes, Joan Joseph Sunol
International Journal of Nanoparticles (IJNP), Vol. 3, No. 3, 2010

Abstract: X-ray diffraction (XRD) and differential scanning calorimetry (DSC) were used to investigate the phase identification and the thermal behaviour of the mechanically alloyed Fe₅₇Co₂₁Nb₇B₁₅ powders. The diffusion of B into the Nb lattice leads, after 1 h of milling, to the formation of a bcc Nb(B) solid solution with a lattice parameter close to a = 0.3425 nm. The solid state reaction between Fe and B gives rise to the formation of Fe₂₃B₆ and Fe₂B boride phases after 3 and 6 h of milling, respectively. On further milling (96 h), an amorphous matrix (∼80%), where nanocrystalline bcc α-Fe, bcc Nb(B), Fe₂B and Fe₃B phases were embedded, is obtained. The broad exothermic reaction in the DSC scans consists of several exothermic peaks and spreads over the entire temperature range 100-700°C. The enthalpy release at temperatures below 300°C can be attributed to recovery and strain relaxation. Crystallisation and grain growth are the dominating processes at high temperatures.

Online publication date: Thu, 07-Oct-2010

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