Extended solid solubility of a Co–Cr system by mechanical alloying

Betancourt-Cantera, J.A.; Jesús, F. Sánchez-De; Torres‐Villaseñor, G.; Bolarín-Miró, A.M.; Cortés-Escobedo, C.A.

doi:10.1016/j.jallcom.2012.03.082

Cited by 23 publications

(13 citation statements)

References 24 publications

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“…Among the various synthesis methods, mechanical alloying (MA) is a method that creates a large number of crystal defects and stacking faults due to the severe plastic deformation that results from the high energy supplied to the system [7,8]. This enables structural changes such as allotropic transformations [9][10][11] which normally occur at high temperatures [12]. In addition, the magnetic properties of mechanically alloyed materials can be notably influenced by the MA process due to the stresses and defects that are generated during the milling process together with a consequent grain size reduction that results in enhanced magnetic behavior [13,14].…”

Section: Introductionmentioning

confidence: 99%

Structural Analysis and Magnetic Properties of FeCo Alloys Obtained by Mechanical Alloying

Jesús

Bolarín-Miró

Cortés-Escobedo

et al. 2016

Journal of Metallurgy

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A systematic study on the structural and magnetic properties of Fe100-xCox alloys (10<x<90, Δx=10 in wt. percent) obtained by mechanical alloying is presented. Elemental powders of Fe and Co mixed in an adequate weight ratio were milled at room temperature in a shaker mixer mill using vials and balls of hardened steel as milling media with a ball : powder weight ratio of 12 : 1. The mixtures were milled for 3 h. The results show that, after milling, for almost all the composition (up to x=60), solid solutions based on bcc structures were obtained. For Co-rich alloys (x≥70), different phases were found, revealing the formation of a metastable intermetallic phase (FeCo, wairauite) together with fcc-Co and hcp-Co phases. The specific saturation magnetization increases by increasing Co content, reaching a maximum value of 225 emu/g for hcp-Fe70Co30, and then it shows a diminution up to 154 emu/g for bcc-Fe30Co70. All studied alloys (Fe100-xCox) present low coercivity, in the range from 0 to 65 Oe, which is lower than reported. The coercivity increases with the increment in Co, reaching a maximum of 64.1 Oe for Fe40Co60. After that, the coercivity falls up to 24.5 Oe for Co-rich alloys, which make them a very low coercive material.

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Section: Introductionmentioning

confidence: 99%

Structural Analysis and Magnetic Properties of FeCo Alloys Obtained by Mechanical Alloying

Jesús

Bolarín-Miró

Cortés-Escobedo

et al. 2016

Journal of Metallurgy

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“…The XRD spectrum obtained from the as‐processed alloy is given in Fig. a, exhibiting a γ (fcc) phase as the matrix of the alloy, together with σ phase, that was identified with data available for CrCo‐σ . Those phases can be seen on the SEM image given in Fig.…”

Section: Resultsmentioning

confidence: 85%

Effect of commercial mouthwashes on the corrosion and tribocorrosion behaviour of a Co-Cr dental casting alloy

Pontes

Alves

Toptan

et al. 2015

Materials and Corrosion

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Co–Cr alloys are widely used in fabrication of removable partial dentures, particularly as a dental framework. The micro‐movements between the framework and the teeth or some particles of food in contact with the framework can lead to wear. The present study aimed at studying the influence of the commercial mouthwashes on the corrosion and tribocorrosion behaviour of the Co−Cr dental casting alloy. Corrosion behaviour was investigated in alcohol‐free and alcohol‐containing Listerine® and Colgate Plax® added artificial saliva solutions at body temperature by electrochemical impedance spectroscopy and potentiodynamic polarization tests. Additionally, tribocorrosion tests, performed in selective solutions under open circuit potential, using a reciprocating ball‐on‐plate tribometer, were used to study the combined action of wear and corrosion. Results suggest that the presence of mouthwashes did not affect negatively the corrosion and tribocorrosion behavior of Co‐Cr dental alloy.

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“…Suryanarayana proposed [25,26], large amount of stored energy was found in nanostructured materials synthesized by means of MA. Therefore, the presence of high density of crystalline defects in nanomaterials has significant impact on solid solubility [27,28]. Figure 5 illustrates the microstructures of initial elemental powders.…”

Section: Methodsmentioning

confidence: 99%

Microstructure and thermodynamic analysis of nanostructured Cu-13.2%Al-4%Ni ternary system synthesized by mechanical alloying

Mayahi

Shokuhfar

Vaezi

2019

Metall. Res. Technol.

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Thermodynamic analysis of nanostructured Cu-13.2%Al-4%Ni synthesized by mechanical alloying was studied through Miedema's semi-empirical model. The variations of lattice strain, crystallite size and microstructural evolution at various milling times were also measured using X-ray diffraction and scanning electron microscope. The results showed an increase in lattice strain and reduction in crystallite size due to an increase in density of structural defects as a result of high-energy collisions during mechanical alloying. The calculated thermodynamic data suggested that in all binary Cu-Al, Al-Ni and Ni-Cu systems, there is a driving force for solid solution formation over all compositions due to negative Gibbs free energy changes in those compositions, while this value is positive for the formation of amorphous phase over some compositions which can be attributed to the absence of driving force. Additionally, thermodynamic data were in agreement with XRD results which showed solid solution was formed at middle stages of mechanical alloying. Moreover, it is concluded that the formation of solid solution is easier at three corners of ternary diagram, where the concentration of one element is major, whilst amorphous phase formation is more desirable in other compositions.Keywords: thermodynamic properties / nanostructured materials / powder metallurgy / mechanical alloying / shape memory alloys *

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Extended solid solubility of a Co–Cr system by mechanical alloying

Cited by 23 publications

References 24 publications

Structural Analysis and Magnetic Properties of FeCo Alloys Obtained by Mechanical Alloying

Structural Analysis and Magnetic Properties of FeCo Alloys Obtained by Mechanical Alloying

Effect of commercial mouthwashes on the corrosion and tribocorrosion behaviour of a Co-Cr dental casting alloy

Microstructure and thermodynamic analysis of nanostructured Cu-13.2%Al-4%Ni ternary system synthesized by mechanical alloying

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