Amorphization of Co-base alloy by mechanical alloying

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

doi:10.1016/j.jnoncrysol.2011.02.016

Cited by 21 publications

(8 citation statements)

References 21 publications

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“…As it can be observed, for Co 90 Cr 10 and Co 80 Cr 20 compositions, the X-ray diffraction patterns show an increase in the intensity of the Co-fcc (1 1 1) reflection and the disappearance of the Cr-bcc peaks (PDF #006-0694, Im-3m, bcc); this result can be attributed to the integration of Cr atoms into the Co-fcc structure by deformation, packing the (1 1 1) plane. In agreement with previous works [26], the Co tends to an hexagonal structure until saturation due to the deformation by MA of the cubic phase. Moreover, for compositions from Co 80 Cr 20 to Co 40 Cr 60 there is evidence of the development of an intermetallic compound, i.e.…”

Section: Resultssupporting

confidence: 93%

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

Betancourt-Cantera

Jesús

Torres‐Villaseñor³

et al. 2012

Journal of Alloys and Compounds

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Section: Resultssupporting

confidence: 93%

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

Betancourt-Cantera

Jesús

Torres‐Villaseñor³

et al. 2012

Journal of Alloys and Compounds

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“…Fig. 3 Mass spectrum obtained via MID mode as well as the process temperature as a function of process time for the: 1 base powder, 3 powder directly after the MA process, 5 powder after the annealing process (dotted line presents the temperature profile, notation according to Table 1) Similar exothermal phenomena in the investigation of the solid-state reaction in the nanocrystalline Fe/SiC composites prepared by mechanical alloying were also registered by Koch et al [16] as well as for the another investigated alloyed system produced by mechanical alloying [17][18][19][20].…”

Section: Resultssupporting

confidence: 70%

Effect of mechanical alloying and annealing on the sintering behaviour of AstaloyCrL powders with SiC and carbon addition

Hebda

Gądek

Skałoń

et al. 2013

J Therm Anal Calorim

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Alloying is one of the several effective ways of increasing the properties of iron-based PM materials. Modifying the chemical composition of AstaloyCrL powder by silicon addition offers subsequent, effective way of increasing the properties of iron-based PM materials. However, silicon has a high affinity for oxygen, therefore, its implementation is problematic during the sintering process of mixtured powders. In order to overcome this problem and to obtain a homogeneous composition of lowalloy steel with silicon addition, it seems that mechanical alloying (MA) is the most useful process. In order to better understand the sintering behaviour of low-alloy steel modified by silicon, the aim of the present study was to determine the effect of the MA process on AstaloyCrL powder with the addition of silicon in the form of silicon carbide and 0.4/0.6 mass% graphite on the thermal effects during heating measured by differential scanning calorimeter and thermogravimetry techniques. Removal of lubricants during heating of the blended powders as well as exhaust gases from the furnace were monitored by quadruple mass spectrometry. Furthermore, both a light optical microscope and a scanning electron microscope were used for microstructure analysis. Moreover, Thermo-Calc computer software program were used to calculate the enthalpy changes and the volume fraction of phases.

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“…In this case, an exceptional experiment was carried on, increasing the milling time until 12 h, confirming that, after this time, the two phases remain in the material (not shown in this paper). The formation of these metastable intermetallic phases is associated with synthesis method (mechanical alloying), which generates enough energy to produce unexpected and out of equilibria phases [13]. Broadening of reflection peaks for all the studied compositions can be observed in all the XRD patterns ( Figures 1 and 2); it is related to the refinement of the microstructure and the increase in the lattice strain caused by the introduction of defects into the crystal structure during the mechanical alloying and also due to the formation of new solid solutions.…”

Section: Structural Analysis Figures 1 and 2 Show The Xrd Patterns Omentioning

confidence: 99%

“…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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Amorphization of Co-base alloy by mechanical alloying

Cited by 21 publications

References 21 publications

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

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

Effect of mechanical alloying and annealing on the sintering behaviour of AstaloyCrL powders with SiC and carbon addition

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

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