Effects of oxidation and cluster distribution on thermal and magnetotransport properties of mechanically alloyed Co–Cu powders

Rattanasakulthong, Watcharee; Sirisathitkul, Chitnarong

doi:10.1007/s00339-005-3455-2

Cited by 3 publications

(2 citation statements)

References 17 publications

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“…According to the equilibrium phase diagram, there is no solubility of lead in copper, and the solid solution may even be supersaturated because the large lattice distortion and boundary deformation induced by mechanical alloying enhance the solubility of alloy. Much work has been done on mechanical alloying of immiscible systems, such as iron‐copper (Fe−Cu), cobalt‐copper (Co−Cu) and copper‐argentum (Cu−Ag) [28–30]. Those works have proved that supersaturated solid solution can be obtained in immiscible systems.…”

Section: Resultsmentioning

confidence: 99%

Thermodynamic analysis of the extension of solid solubility in copper‐lead immiscible system prepared by mechanical alloying

Xie

et al. 2021

Materialwissenschaft Werkst

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X‐ray diffraction analysis, scanning electron microscopy and thermodynamic calculations in the Miedema's model were used to study the extension of solid solubility in copper‐lead immiscible system prepared by mechanical alloying. The result shows that the nanocrystalline supersaturated solid solution formed during the alloying process. The Gibbs free energy change in this system during the formation of solid solution is calculated and shows to be positive, which means that a thermodynamic barrier exists for the formation of this alloy system in solid state. It has been found that the additional energy stored in nanocrystalline copper‐lead alloy during the alloying process as a result of crystallite size reduction and increased dislocation density, would be high enough to overcome the thermodynamic barrier in the formation of a solid solution.

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Section: Resultsmentioning

confidence: 99%

Thermodynamic analysis of the extension of solid solubility in copper‐lead immiscible system prepared by mechanical alloying

Xie

et al. 2021

Materialwissenschaft Werkst

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“…1,2 Milling ferromagnetic powders (i.e., Co, Fe, Ni) with non-magnetic metals (e.g., Au, Cu, Ag) gives rise to mechanical alloys with a giant magnetoresistance (GMR) effect. 3 Since an addition of Si reduces the magnetic anisotropy and the eddy-current loss in commercial steels, Fe-Si mechanical alloys also received much interest. [4][5][6][7] By contrast, Co-Si alloys only gained attention in the last decade after being recognized as hydrogen-storage materials for nickel-metal hydride batteries.…”

Section: Introductionmentioning

confidence: 99%

Evolution of the microstructure and magnetic properties of a cobalt-silicon-based alloy in the early stages of mechanical milling

Rattanasakulthong¹,

Sirisathitkul²,

Rogl³

2015

Mater. Tehnol.

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The early stages in the mechanical alloying of amount fractions x = 40 % cobalt (Co) and x = 60 % silicon (Si) powders were investigated using X-ray diffractometry (XRD), scanning electron microscopy (SEM), differential thermal analysis (DTA) and vibrating-sample magnetometry (VSM). After 2-8 h of ball-milling, the characteristic XRD peaks of the face-centered-cubic (fcc) Si and hexagonal close-packed (hcp) Co phases remained sharp without a cobalt-silicide phase. As the milling progressed, the particle size observed by SEM tended to reduce, being accompanied by smoother edges and a narrow size distribution. On the DTA curves, between 200°C and 1200°C, exothermic peaks indicated a ferromagnetic-to-paramagnetic transition, whereas endothermic peaks corresponded to the lattice recovery, the transition from a hcp to a fcc Co and melting. The longest milling of up to 8 h significantly increased the magnetic squareness and the coercive field. Keywords: Co-Si alloys, ball milling, XRD, VSM, DTA Preiskovan je bil za~etni stadij mehanskega legiranja zlitine, sestavljene iz prahov z mno`inskim delom x = 40 % kobalta (Co) in x = 60 % silicija (Si). Uporabljena je bila rentgenska difraktometrija (XRD), vrsti~na elektronska mikroskopija (SEM), diferencialno termi~na analiza (DTA) in vibracijska magnetometrija vzorcev (VSM). Po mletju od 2 h do 8 h v krogli~nem mlinu so {e ostali ostri zna~ilni XRD-vrhovi faz fcc Si in hcp Co brez Co-silicidne faze. S podalj{evanjem~asa mletja se s SEM opazi zmanj{anje velikosti delcev prahov, zo`anje njihove velikostne porazdelitve in pove~anje zaobljenja robov delcev. Na DTA-krivuljah se je med 200°C in 1200°C pojavil eksotermni vrh, ki je posledica prehoda iz feromagnetne v paramagnetno fazo, endotermni vrh pa je posledica poprave re{etke zaradi prehoda iz hcp v fcc Co in nato taljenja. Najdalj{i~asi mletja (do 8 h) pomembno vplivajo na magnetno koercitivnost in pove~anje kvadrati~nosti histerezne zanke. Klju~ne besede: zlitina na osnovi Co-Si, krogli~no mletje, XRD, VSM, DTA

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Co-Cu-O Ternary Phase Diagram Evaluation

Mayer,

Fabrichnaya,

Dreval

et al. 2016

MSI Eureka

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Effects of oxidation and cluster distribution on thermal and magnetotransport properties of mechanically alloyed Co–Cu powders

Cited by 3 publications

References 17 publications

Thermodynamic analysis of the extension of solid solubility in copper‐lead immiscible system prepared by mechanical alloying

Thermodynamic analysis of the extension of solid solubility in copper‐lead immiscible system prepared by mechanical alloying

Evolution of the microstructure and magnetic properties of a cobalt-silicon-based alloy in the early stages of mechanical milling

Co-Cu-O Ternary Phase Diagram Evaluation

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