Thermodynamic optimization of the Ni-Zn system

Vassilev, G. P.; Gómez-Acebo, T.; Tedenac, Jean‐Claude

doi:10.1361/105497100770340075

Cited by 49 publications

(27 citation statements)

References 29 publications

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“…Measurements of the thickness of the intermetallic compound layers by SEM allowed evaluation of the rate and controlling mechanism of growth of the layers. EDS analysis on the transition zone between nickel and zinc or its intermetallic compounds was also carried out to determine the phases of Zn-Ni alloys in the zone according to the Ni-Zn binary phase diagram [8] . Fig.1 shows the typical interfacial microstructures of solid Ni-liquid Zn transition zone at three temperatures after immersing time of 300 s, and EDS results for the transition zone in Fig.1 were shown in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…Phase identification was confirmed on the basis of at least five compositional measurements of a given phase using EDS. The results measured by using the reaction couple method at 400 ℃ [6] and calculated by thermodynamic optimization of Ni-Zn phase diagram [8] were also listed in Table 1 as reference. It was clear from Table 1 that the EDS results were much closed to the reference data.…”

Section: Methodsmentioning

confidence: 99%

“…γ phase: 15.0-21.8 [8] Particles in the melt 10.20 δphase: 11.0±0.3-12.5±0.2 [6] ；10-11.1 [8] composition ranges of these two layers were in the homogeneity range ofγ phase. In fact, these two layers both belong toγphase and have an inverse antiphase domain structure though they have different morphology and had been considered as two different crystal structures ofγ phase andγ 1 phase in the early [8] .…”

Section: Morphology and Characteristics Of Ni-zn Transition Zonementioning

confidence: 98%

“…γphase: 15.0-21.8 [8] Particles in the melt 10.07 δphase: 11.0±0.3-12.5±0.2 [6] ；10-11.1 [8] 650 adjacent to nickel base 21.78-26.47 γ 1 phase: 22.0-26.5 [8] adjacent to zinc base 15.37-20.13…”

Section: Morphology and Characteristics Of Ni-zn Transition Zonementioning

confidence: 99%

“…In fact, these two layers both belong toγphase and have an inverse antiphase domain structure though they have different morphology and had been considered as two different crystal structures ofγ phase andγ 1 phase in the early [8] . In this paper, we still adoptγ andγ 1 to identify the two layers with different morphology in order to discuss the kinetics of layer growth clearly.…”

Section: Morphology and Characteristics Of Ni-zn Transition Zonementioning

confidence: 99%

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Interfacial reaction between solid nickel and liquid zinc

Kong

2008

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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Interfacial reactions between solid nickel and liquid zinc at 450-650 ℃ for 30-600 s were studied. The morphology and growth behavior of intermetallic compound layers at the interface between solid nickel and liquid zinc were observed and analyzed by SEM and EDS. The results show thatγand δ phases are formed at 450 ℃ at the Ni/Zn interface, and at 550 and 650 ℃ ℃ onlyγphase is formed at the interface and someδ phase particles will be participated during solidification on the surface ofγphase layer. Theβ 1 phase is absent under experimental conditions. Many cracks occur in the layers due to the difference in thermal expansion coefficients of these phases. It is found that the kinetics of the intermetallic compounds growth follows a parabolic law of time, as controlled by the diffusion mechanism. The apparent activation energies are 113.9 kJ/mol for the growth ofγphase and 125.87 kJ/mol forγ 1 phase, respectively.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Morphology and Characteristics Of Ni-zn Transition Zonementioning

confidence: 98%

Section: Morphology and Characteristics Of Ni-zn Transition Zonementioning

confidence: 99%

Section: Morphology and Characteristics Of Ni-zn Transition Zonementioning

confidence: 99%

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Interfacial reaction between solid nickel and liquid zinc

Kong

2008

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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First‐principles calculations of thermodynamic properties and planar fault energies in Co₃X and Ni₃X L1₂ compounds

Breidi

Allen

Mottura

2017

Physica Status Solidi (b)

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We do Density Functional Theory based total‐energy calculations of the normalL12 phase in Co3X and Ni3X compounds, X being a transition metal element. The lattice parameters, magnetic moments and formation enthalpies are determined and compared with the available experimental data. The (111) superlattice intrinsic stacking fault energy (SISF), a crucial factor affecting materials strength and their mechanical behavior, is calculated using the axial interaction model. We have applied the quasiharmonic Debye model in conjunction with first‐principles in order to establish the temperature dependence of the lattice parameters and the (111) SISF energies. We investigate our prediction of a low formation enthalpy in the system Ni −25 at.%Zn by doing auxiliary simulations for the fcc random alloy at the composition 25 at.%Zn. Our simulations indicate that the elements Ti, Zr, Hf, Nb, and Ta can help stabilizing the promising and extremely important Co3Al0.5W0.5 alloy.

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