Structure and Thermal Stability of CuCo and CuFe Alloys Prepared by Mechanical Alloying

Elkalkouli, R.; Chartier, Patrick; Dinhut, J.F.

doi:10.4028/www.scientific.net/msf.179-181.267

Cited by 7 publications

(3 citation statements)

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“…The results have been summarized in [ 46 ]. From many reports, it is seen that a metastable solid solution of iron in copper can be formed in Cu–rich mixtures as a result of mechanical alloying [ 35 , 36 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 ]. These solid solutions are of fcc structure.…”

Section: Discussionmentioning

confidence: 99%

“…The concentration of iron in the solid solution and the concentration of copper in the mixture, at which the solid solution forms, depending on the processing conditions. Reflections of the bcc phase were no longer visible in the XRD patterns of the mixtures after 400 h [ 49 ], 150 h [ 48 ], 65 h [ 35 ], 24 h [ 50 , 53 ], 16 h [ 51 ], or 4 h [ 52 ] of mechanical alloying. If high-energy milling is used, the peaks of iron disappear from the XRD patterns after 30 min of treatment [ 47 ].…”

Section: Discussionmentioning

confidence: 99%

“…In Ref. [ 52 ], in a Fe30Cu80 mixture milled at a ball-to-powder weight ratio of 5:1 for 24 h, iron clusters were not found in the fcc structure. In the MS spectrum of the Fe20Cu80 mixture milled for 16 h, only a non-magnetic doublet was detected [ 51 ].…”

Section: Discussionmentioning

confidence: 99%

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Elimination of Composition Segregation in 33Al–45Cu–22Fe (at.%) Powder by Two-Stage High-Energy Mechanical Alloying

et al. 2022

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In the present work, complex powder alloys containing spinel as a minor phase were produced by mechanical alloying in a high-energy planetary ball mill from a 33Al–45Cu–22Fe (at.%) powder blend. These alloys show characteristics suitable for the synthesis of promising catalysts. The alloying was conducted in two stages: at the first stage, a Cu+Fe powder mixture was ball-milled for 90 min; at the second stage, Al was added, and the milling process was continued for another 24 min. The main products of mechanical alloying formed at each stage were studied using X-ray diffraction phase analysis, Mössbauer spectroscopy, transmission electron microscopy, and energy-dispersive spectroscopy. At the end of the first stage, crystalline iron was not found. The main product of the first stage was a metastable Cu(Fe) solid solution with a face-centered cubic structure. At the second stage, the Cu(Fe) solid solution transformed to Cu(Al), several Fe-containing amorphous phases, and a spinel phase. The products of the two-stage process were different from those of the single-stage mechanical alloying of the ternary elemental powder mixture; the formation of undesirable intermediate phases was avoided, which ensured excellent composition uniformity. A sequence of solid-state reactions occurring during mechanical alloying was proposed. Mesopores and a spinel phase were the features of the two-stage milled material (both are desirable for the target catalyst).

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Elimination of Composition Segregation in 33Al–45Cu–22Fe (at.%) Powder by Two-Stage High-Energy Mechanical Alloying

et al. 2022

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Structural State of Mechanically Alloyed Cu–Co Compound with a Considerable Magnetoresistance Effect

Уймин

Yermakov

Serikov

et al. 1998

phys. stat. sol. (a)

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The structural state of the Cu80Co20 compound after mechanical alloying and a subsequent thermal treatment has been studied by NMR spectroscopy and X‐ray diffraction as well as measurements of magnetic and magnetoresistive properties. The analysis of the data obtained suggests the presence of ultradispersed cobalt particles in the copper matrix. A partial dissolving of cobalt in copper is likely to take place in defect regions. Such a structure is responsible for superparamagnetism of the Cu80Co20 compound at kT > 150 K and for a considerable GMR effect (12% at T = 77 K). The shifting of X‐ray peaks of the copper matrix can be related to a coherent conjugation of Cu and Co constituents.

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Magnetic State, Transport Properties and Structure of Granular Nanophased Systems

Yermakov

Уймин

Мушников

et al. 1998

Nanostructured Materials

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Structure and Thermal Stability of CuCo and CuFe Alloys Prepared by Mechanical Alloying

Cited by 7 publications

References 0 publications

Elimination of Composition Segregation in 33Al–45Cu–22Fe (at.%) Powder by Two-Stage High-Energy Mechanical Alloying

Elimination of Composition Segregation in 33Al–45Cu–22Fe (at.%) Powder by Two-Stage High-Energy Mechanical Alloying

Structural State of Mechanically Alloyed Cu–Co Compound with a Considerable Magnetoresistance Effect

Magnetic State, Transport Properties and Structure of Granular Nanophased Systems

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