Structural, mechanical and magnetic properties of Fe — 40-at.% Al powders during mechanical alloying

The magnetic and structural properties of nanostructured (Fe75Al25) 100-xBx alloys prepared by mechanical alloying

“…The successive accumulation and interaction of dislocation cause a reduction in the crystallite size and the lattice parameter decreased with milling time. Such variation in the lattice parameter of FeAl powders was observed by Hamlati et al[2], Fan et al[17] and Baris et al[18] and was attributed to the ordered structure as reported by Chan[19]. So, it can be concluded that elemental Fe and Al are alloyed to form slightly ordered bcc-Fe(Al) after 20 h milling, consistent with ordered phase.No obvious change is observed from the XRD patterns of powders milled for longer time and the lattice reached a steady value of 0.28649(1) Å.…”

Structure of Al-Fe alloys synthesized from elemental powders by severe plastic deformation under high pressure

“…Note should be made that in some electron diffraction patterns, alongside with diffraction rings from a polycrystalline alloy, a regular network of reflections was observed, indicating the formation of various iron aluminides in the process of mechanical alloying. It was reported earlier in literature that during processing of aluminum and iron powders in a planetary mill, the formation of iron aluminides with different structures was observed [6,10,11,13]. The analysis of the observed diffraction pattern did not allow us to identify it with any known iron aluminides, and due to an insufficient quantity of micro-electron diffraction patterns with different zone axes it was impossible to define their structure.…”

“…Therefore one of the most important tasks in developing the alloys of aluminum with various d-metals is to enhance their solubility in the α-phase of aluminum or produce such composite structures in which an alloying metal would be present in the form of small particles uniformly distributed in the aluminum crystal lattice. The methods of energy action on powder mixtures [1][2][3][4][5][6][7][8][9][10][11][12][13] are to the ways that enable one to produce such alloys. Among them, the most promising is the synthesis of alloys from elemental powders through the application of severe plastic deformation under high pressure in Bridgman's anvils [14][15][16][17][18][19][20].…”

Phase formation and magnetic properties of nanocrytalline Ni70Co30 alloy prepared by mechanical alloying

“…Considering that this lamellar phase is very reactive, the diffusivity of Co and Ni elements is enhanced. Many studies [38][39][40] confirmed that these lamellar multilayer structures are usually formed in ductileductile mechanically alloyed systems, as a result of the combination of frequent mechanical deformations and cold welding. The micrograph of milled powders for 25h illustrates the competition between the two mechanisms of hard deformations and welding.…”