Bulk and dynamic properties in Al–Zn and Bi–In liquid alloys using a theoretical model

Odusote, Yisau Adelaja; Hussain, L. A.; Awe, O. E.

doi:10.1016/j.jnoncrysol.2006.12.023

Cited by 21 publications

(16 citation statements)

References 15 publications

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“…Similar results are obtained by authors of this work using the Quasi-Lattice Theory and molecular dynamics simulations [33]. Our results are also consistent with those computed for another set of RK parameters [29] and data modelled using the Quasi-Lattice theory as obtained by Odusote [34].…”

Section: Microscopic Functions: the Concentration-concentration Functsupporting

confidence: 92%

Thermodynamics And Concentration Fluctuations Of Liquid Al-Cu And Al-Zn Alloys

Trybula¹,

Jakse²,

Gąsior³

et al. 2015

Archives of Metallurgy and Materials

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Thermodynamic properties of liquid Al-Cu and Al-Zn alloys are investigated using the free volume model. We also analyse local atomic arrangements and concentration fluctuations in both liquid binary alloys from the determination of the Warren-Cowley short-range order. For liquid Al-Cu alloys, our findings indicate a strong preference for heteroatomic nearest-neighbors bonds on the Cu-rich side and weaker ones in the Al-rich part while for the liquid Al-Zn alloy, a tendency to the phase separation is observed. Basing on Darken's thermodynamic relationship, diffusivity has been examined for both liquid alloys.Keywords: Al-Cu alloys, Al-Zn alloys, CSRO parameter, free volume model, diffusivity W oparciu o model swobodnej objętości zostały zbadane właściwości termodynamiczne ciekłych stopów Al-Cu i Al-Zn oraz lokalne środowisko atomów w celu obliczenia parametru bliskiego zasięgu Warren-Cowleya. W ciekłych stopach Al-Cu zaobserwowano silną tendencję do tworzenia wiązań hetero-atomowych w obszarze bogatym w Cu, natomiast w obszarze stężeń bogatych w Al znacznie słabszą. W przypadku ciekłych stopów Al-Zn obliczenia wskazują na tendencję do segregacji atomów. Dyfuzja w dyskutowanych stopach została przeanalizowana w oparciu o termodynamiczną definicję podaną przez Darkena.

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Section: Microscopic Functions: the Concentration-concentration Functsupporting

confidence: 92%

Thermodynamics And Concentration Fluctuations Of Liquid Al-Cu And Al-Zn Alloys

Trybula¹,

Jakse²,

Gąsior³

et al. 2015

Archives of Metallurgy and Materials

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“…The effect of atomic size mismatch volume on S cc (0) in the long-wavelength limit is also considered. The size ratio is To obtain a clear picture of the nature of segregation and ordering in the binary liquid alloys, another quantity known as the Warren-Cowley CSRO parameter, α 1 , [6,24,29] is computed. This is related to the S cc (0) by…”

Section: Concentration Fluctuations Warren-cowley Csro Parameter Andmentioning

confidence: 99%

“…Using the Darken thermodynamic equation for diffusion, an expression that relates diffusion and S cc (0) can be established [6,9,27]; thus, one can write…”

Section: Chemical Diffusionmentioning

confidence: 99%

“…Systems such as Au-Bi, Bi-Cd, Al-Bi, Ni-Pt and Fe-Pt are examples of liquid alloys. All liquid binary alloys can be classified according to the deviations of their thermodynamic and thermophysical functions from Raoultian behaviour into two main groups: segregating (positive deviation) or short-range ordered (negative deviation) alloys [6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of ordering phenomenon in Me–Pt (Me=Fe,Ni) liquid alloys

Odusote

2008

Science and Technology of Advanced Materials

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The phase diagrams of Fe-Pt and Ni-Pt liquid alloy systems show the existence of FePt and NiPt intermetallic compounds, respectively, in their solid intermediate states, and the associative tendency between unlike atoms in these liquid alloys has been analysed using the self-association model. The concentration dependences of mixing properties such as the free energy of mixing, G M ; the concentration fluctuations, S cc (0), in the long-wavelength limits; the chemical short-range order (CSRO) parameter, α 1 ; as well as the chemical diffusion, enthalpy and entropy of the mixing of Fe-Pt and Ni-Pt liquid alloys have been investigated to determine the nature of ordering in the liquid alloys. The results show that heterocoordination occurs in the alloys at all concentrations. The effect of CSRO on S cc (0), chemical diffusion, D, and the order parameter, α 1 , has been considered. The ordering phenomenon in the liquid alloys is also related to the effect of the atomic size mismatch volume on S cc (0).

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“…Na-Pb, Na-Hg, K-Pb and K-Hg are examples of binary alloys. Classification of binary alloys can be done according to the deviation of their thermodynamic functions such as chemical activity from raoulatian ideality, therefore binary alloys can be classified into two main groups; segregating (positive deviating) and heteoro-coordinating (negative deviating) alloys [6,7]. The interest in the energetic and its effects on the alloying behavior of Na-Pb and Na-Hg stemmed from the understanding that, despite the hazards involved in the unsafe handling of Na-Pb alloy, it may still be relevant in qualitative inorganic analysis, both as reductant in acidic and alkaline media, and also as a source of sodium hydroxide for hydroxide precipitations [8].…”

Section: Introductionmentioning

confidence: 99%

Chemical Ordering in Na-Pb and Na-Hg Binary Liquid Alloys

Ajayi¹,

Ogunmola²

2017

Preprint

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A simple model has been used to investigate the nature of chemical order in Na-Pb and Na-Hg liquid binary alloy at 700K and 673K respectively. The energy parameter obtained from the model was used to calculate the concentration dependent mixing properties such as Gibb's free energy of mixing, Concentration fluctuations in the long wavelength limit and the Warren-Cowley chemical short range order parameter. Results obtained showed that both alloys are heterocoordinated throughout the entire concentration and there is tendency for segregation and demixing to take place in the liquid alloys. We observed that Na-Hg liquid alloy is more strongly interacting binary alloy and chemically ordered than Na-Pb liquid alloy.

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Bulk and dynamic properties in Al–Zn and Bi–In liquid alloys using a theoretical model

Cited by 21 publications

References 15 publications

Thermodynamics And Concentration Fluctuations Of Liquid Al-Cu And Al-Zn Alloys

Thermodynamics And Concentration Fluctuations Of Liquid Al-Cu And Al-Zn Alloys

Investigation of ordering phenomenon in Me–Pt (Me=Fe,Ni) liquid alloys

Chemical Ordering in Na-Pb and Na-Hg Binary Liquid Alloys

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