Thermodynamic assessment of the Al-Zr binary system

Wang, Tao; Jin, Zhanpeng; Zhao, Ji‐Cheng

doi:10.1007/s12385-001-0072-4

Cited by 51 publications

(17 citation statements)

References 12 publications

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“…known to result in liquid phase formation are summarised below. 24 During hot pressing, it is possible that liquid products of such reactions might be squeezed into the clearances of the die/punch setup, forming the observed residues.…”

Section: Characterizationmentioning

confidence: 99%

Synthesis of MAX Phases in the Zr-Ti-Al-C System

et al. 2017

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This study reports on the synthesis and characterization of MAX phases in the (Zr,Ti)AlC system. The MAX phases were synthesized by reactive hot pressing and pressureless sintering in the 1350-1700 °C temperature range. The produced ceramics contained large fractions of 211 and 312 (n = 1, 2) MAX phases, while strong evidence of a 413 (n = 3) stacking was found. Moreover, (Zr,Ti)C, ZrAl, ZrAl, and ZrAl were present as secondary phases. In general, the lattice parameters of the hexagonal 211 and 312 phases followed Vegard's law over the complete Zr-Ti solid solution range, but the 312 phase showed a non-negligible deviation from Vegard's law around the (Zr,Ti)AlC stoichiometry. High-resolution scanning transmission electron microscopy combined with X-ray diffraction demonstrated ordering of the Zr and Ti atoms in the 312 phase, whereby Zr atoms occupied preferentially the central position in the close-packed MX octahedral layers. The same ordering was also observed in 413 stackings present within the 312 phase. The decomposition of the secondary (Zr,Ti)C phase was attributed to the miscibility gap in the ZrC-TiC system.

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Section: Characterizationmentioning

confidence: 99%

Synthesis of MAX Phases in the Zr-Ti-Al-C System

et al. 2017

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“…Phonon calc. C Al 3 Zr p (T) Esin et al [45] Derivative of ∆H Al 3 Zr (T ) Serebrennikov et al [48] Derivative of ∆H Al 3 Zr (T ) Kemsies et al [60] DSC 300-825 K Quantum Espresso GGA-PBE -184.4 Table 5: Numerical values for the calculation of ∆H 2 (T ) for T=996.15 K involved in reaction (2), according to the Wang's [52], the Fischer's [53] assessments and this work. 1 Table 6: Solubilities (C s in wt.%) in liquid aluminum, diffusion coefficients in liquid aluminum (D 0 in m 2 .s −1 ) for different transition metals at 1023 K from Eremenko et al [37] and densities at the melting temperature from different authors.…”

Section: Resultsmentioning

confidence: 99%

“…− ∆H Zr(hcp) (298.15K) + ∆E [19,47,49] only overestimated by 5% whereas they seem to invalidate the lowest values by [43,45] as well as the highest one by [50]. For ∆H Al 3 Zr (T ) ( Table 3), Wang et al [52] and Fischer et al [53] selected the values of Esin et al [45,48] who determined heat contents of Al 3 Zr from adiabatic calorimetry measurements between 300 and 2000 K. Esin's data are not very well documented. In addition the heat capacity values recently reported in [60] are significantly different from Esin's data.…”

Section: Interpretation Of the Measured Thermal Effectmentioning

confidence: 96%

“…More recently, very different ∆ f H Al 3 Zr (298.15K) values obtained by using a technique coupling thick multilayer foils and differential scanning calorimetry were reported by Weihs et al [49] and Fischer et al [50]. Finally, different assessments of the Al-Zr phase diagrams have been published [44,[51][52][53], in particular the two most recent and complete ones, from Wang et al [52], Fischer et al [53], and Tamim et al [54], reflecting the absence of consensus on the ∆ f H Al With the Quantum Espresso code [55], we have performed DFT simulations within the GGA-PBE approximation to calculate ∆ f H Al 3 Zr (0K) for the stable D0 23 structure of Al 3 Zr, the zero-point energies, and the enthalpic terms described within the framework of the harmonic approximation, in order to evaluate the order of magnitude of the vibrational contributions. Theoretically, the enthalpy of formation at 0K resulting from an ab initio calculation corresponds to only electronic contributions.…”

Section: Interpretation Of the Measured Thermal Effectmentioning

confidence: 99%

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Critical evaluation of experimental data of solution enthalpy of zirconium in liquid aluminum

Barrachin

Gajavalli

Decreton

et al. 2019

The Journal of Chemical Thermodynamics

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The aim of the present paper is to propose a new interpretation of the zirconium dissolution in liquid aluminum calorimetry experiments performed in the past in order to reconcile some apparently contradictory results and observations. It is supported by the development of a dissolution kinetics model. We show that probably most of the experiments interpreted in terms of dissolution must be considered in terms of (partial or total) transformation of zirconium into zirconium aluminide (Al 3 Zr). In addition, on the basis of the developed model, we propose some recommendations in terms of experimental conditions to improve the dissolution process. These recommendations are consistent with some empirical rules derived in the past. It also puts in question past standard enthalpy measurements of some compounds in the Cu-Zr, Ni-Zr, Co-Zr and U-Zr systems.

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“…Zr solubility (at room temperature) in the fcc-Al phase (denoted further as (Al) or matrix-phase) is rather small [9][10][11][12][13] and intermetallic compounds (mainly Al 3 Zr) are formed, commonly, when the solubility limit is exceeded. Nine more intermetallic compounds (IMC) have been reported for the Al-Zr system [13].…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Surface Oxide Growth Kinetics of Al–Si–Zr Bulk Alloys and Ribbons

Kiradzhiyska

Vassilev

Mancheva

et al. 2021

Metals

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A typical modification technique of the functional properties of Al–Si based alloys is the addition of some third element in trace level. In the present work, ternary Al–Si–Zr bulk and ribbon alloys have been prepared. The kinetics of high-temperature surface oxidation has been studied by thermogravimetric method. It was found that at the start of the experiment the chemical reaction velocity is rate-controlling while for longer times the (oxygen) diffusion is the rate-controlling process. Activation energy of the two stages of oxidation has been obtained. Additional studies such as thermochemical analysis, optical and electron microscopy, and microhardness tests have been done.

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Thermodynamic assessment of the Al-Zr binary system

Cited by 51 publications

References 12 publications

Synthesis of MAX Phases in the Zr-Ti-Al-C System

Synthesis of MAX Phases in the Zr-Ti-Al-C System

Critical evaluation of experimental data of solution enthalpy of zirconium in liquid aluminum

High-Temperature Surface Oxide Growth Kinetics of Al–Si–Zr Bulk Alloys and Ribbons

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