Structural Characterization of Nanostructured Fe-8P Powder Mixture

Abstract

Nanostructured Fe-8P (wt%) powder mixture was prepared by high energy ball milling in a planetary ball mill (Fritsch P7) under argon atmosphere. The morphology of the particles, the phase identification and the alloying evolution process as a function of milling time are studied by scanning electron microscopy (SEM), X-ray diffraction (XRD) and 57Fe Mössbauer spectrometry (MS), respectively. Refinement based on Rietveld method of the XRD patterns and the Mössbauer spectra analysis show that the Fe(x)P (1 < x < 2) and Fe2P phosphide phases are the main product after 3 h of milling (approximately 10%). From the XRD Rietveld refinement, it is observed that the Fe2P phase disappears completely after 12 h of milling, while the Fe3P nanophase appears after 9 h and remains for larger milling duration. The lattice structure distortion is evidenced by the lattice parameter changes of the milled products. A two structure state of the alpha-Fe(P) solid solution: alpha-Fe1 and alpha-Fe2 is confirmed by both the XRD and MS measurements. After milling for 21 h, a mixture of a disordered two phase alpha-Fe(P) solid solution, Fe3P nanophase and a small amount of a paramagnetic FeP phosphide phase (approximately 2%) is obtained.

Structural and Thermal Study of Nanocrystalline Fe-Al-B Alloy Prepared by Mechanical Alloying

“…Among the non-equilibrium processing techniques that are used for the synthesis of NC materials, mechanical alloying (MA) has received serious attention because of the versatility and the favorable economics of the process. [12][13][14] During mechanical alloying, powders undergo a severe plastic deformation, which introduces a number of defects (dislocations, grain boundaries, vacancies, and interstitials) into the material. The constituents that favor the formation of a metastable structure can then ''self assemble'' into nanoscale grains.…”

Magnetic and structural characterization of the mechanically alloyed Fe75Si15B10 powders

“…Mechanical alloying (MA) has been used as a powerful nonequilibrium processing method that can produce a variety of nanocrystalline (NC) [1][2][3][4][5][6][7] and other non-equilibrium structures in large quantities [8][9][10]. MA uses severe plastic deformation to introduce defects (dislocations, grain boundaries, vacancies and interstitials) into the material which can then "self assemble" into nanoscale grains.…”

Magnetic properties of nanostructured Fe92P8 powder mixture

“…The alloying process of some materials exhibits a violent combustion reaction in which there is an instant alteration of reactions to products [9][10][11]. According to the low melting temperature and the red phosphorus thermodynamic properties such as its combustion during an impact or a friction, high energy ball milling has been used to prepare Fe-P alloys starting either from elemental powder mixtures [12,13], Fe-P ingot [14] or both of them [15] owing to the extremely small solubility of phosphorus (<0.026 at.% P) into bcc ␣-Fe at room temperature [16]. Most of the studied Fe-P system was concerned with P concentration higher than 10 at.%, where the end product mainly constituted of phosphides exhibits Curie temperatures smaller than 700 K. However, small P concentrations were of little interest, although very scientific knowledge could be acquainted on the effect of the presence of P concentrations close to solubility limit and their presence in the vicinity of the Fe atoms.…”