Calorimetric Determination of the Enthalpies of Formation of Liquid Ni-Zr Alloys

Arpshofen, Ingo; Lück, Reinhard; Predel, B.; Smith, J. F.

doi:10.1007/bf02645710

Cited by 37 publications

(14 citation statements)

References 17 publications

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“…The mixing enthalpies in the liquid have been studied at 1565 K, 19) 1784 K, 22) 1838 K, 22) 1916 K, 23) 1963 K, 24) and 2270 K. 23) At low temperatures, the formation enthalpy of amorphous alloys was measured by Turchanin et al, 25) Spit et al 26) and Henaf et al 27) where there measurements are not in agreement. The formation enthalpy reported by Truchanin et al 25) is a more negative result and in this case the amorphous phase would be more stable than the intermetallic compounds.…”

Section: Experimental Datamentioning

confidence: 99%

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Thermodynamic Modeling of the Undercooled Liquid in the Ni–Zr System

et al. 2005

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Using thermodynamic data obtained over a wide range of temperatures, a thermodynamic assessment of the Ni-Zr system was carried out. The associated solution model was applied to describe the short range ordering in the liquid, and the glass transition was treated as a second order transition, using the Hillert-Jarl functions. The driving force of crystallization, and the time-temperature-transformation (TTT) curves were estimated from the optimized parameter set, and compared with experimental data and the results of previous thermodynamic assessments. Taking into account the low temperature thermodynamic data, the calculated driving force was found to have decreased compared to the previous assessments. Consequently, the nose of the TTT curve was shifted to higher times.

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Section: Experimental Datamentioning

confidence: 99%

“…In the present assessment, the driving force starts to deviate from the linear relationship at around 1300 K and gradually decreases, due to the formation of the associate as the temperature decreases. 1565K [19] 1740K [22] 1838K [22] 1916K [23] 1963K [24] 2270K [23] Present work 1565K 2270K 5)…”

Section: The Driving Force Of the Crystallizationmentioning

confidence: 99%

Thermodynamic Modeling of the Undercooled Liquid in the Ni–Zr System

et al. 2005

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“…Detailed information about the thermodynamic data and glass formation is given in the literature [6,14]. Depending on the temperature and composition, it is to be expected that chemical short-range order for the melt can occur in the vicinity of the three intermetallic compounds Ni7Zr2 Tm--= 1713 K), NiZr (Tin = 1533 K), and NiZr 2 (Tm= 1393 K).…”

Section: Introductionmentioning

confidence: 99%

“…From this point of view, we are investigating the mixing enthalpy of the binary glass-forming systems Fe-Zr, Ni-Zr, and Co-Zr. For these systems, data were missing for the Zr-rich range and a temperature-dependent description of AH" could not be given [2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of the mixing enthalpy and excess heat capacity in the liquid system nickel-zirconium

et al. 1996

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The mixing enthalpy AH m of the liquid system Ni-Zr was measured in the Nirich range at 1916 K up to .Xzr = 0.34 at % and for the first time in the Zr-rich range at 2270 K up to -X' Ni = 0.54 at %. Using the thermodynamic-dapted power series, a composition-and temperature-dependent description of AH m was given. Furthermore, the partial differentiation of AHm(x, T) by T yielded the excess heat capacity CpX~(x, T). The existence of chemical short-range order (associate) in the vicinity of Ni7Zr2 and NiZr was shown and was discussed with reference to AHm(x, T) and CpX~(x, T) ( 1748 to 2270 K). With decreasing temperature, the influence of chemical short-range order tended toward the composition NiZr.

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“…In this binary system, the phase boundaries have been investigated over the entire composition range by Kirkpatrick and Larsen,32) and for the Ni-rich region by Bsenko 33) 35,36) and the enthalpy of formation for the compound phases [37][38][39][40] have been reported. A critical assessment of this binary system has been carried out by Nash and Jayanth, 41) and a thermodynamic assessment has been reported by Saunders. 42) Ghosh 43) has performed a thermodynamic reassessment of this binary system, taking into account the formation of Ni 3 Zr and Ni 11 Zr 9 , and the homogeneity range of Ni 5 Zr and Ni 10 Zr 7 , which were excluded by Saunders.…”

Section: The Ni-zr Binary Systemmentioning

confidence: 99%

Thermodynamic Analysis of the Phase Equilibria in the Nb-Ni-Zr System

et al. 2007

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A thermodynamic study of phase equilibria in the Nb-Ni-Zr system has been carried out experimentally and using the CALPHAD method. To enable the thermodynamic description of the constituent binary systems, the results from a previous evaluation were adopted for the Nb-Ni, Ni-Zr and Nb-Zr systems. However, some modifications of the thermodynamic parameters of the Ni-Zr system were made based on recent experimental data on the binary and ternary phase equilibria. The phase boundaries involving the liquid phase in the Nb-Ni-Zr ternary system at the constant 60 mol%Ni and 20 mol%Zr were determined experimentally using differential scanning calorimetry (DSC). The thermodynamic parameters of the Nb-Ni-Zr ternary system were evaluated by combining the experimental results from DSC with reported phase boundaries of the isothermal sections at 773 and 1073 K. The calculated results reproduced the DSC results as well as the experimental isothermal sections. Furthermore, the amorphous-forming ability of Nb-Ni-Zr ternary alloys was evaluated by incorporating the thermodynamic properties from the phase diagram calculations into the Davies-Uhlmann kinetic formulations. The calculated critical cooling rates in the observed metallic glass forming compositional range were found to be lower than those in the observed amorphous forming range by one or more orders of magnitude.

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Calorimetric Determination of the Enthalpies of Formation of Liquid Ni-Zr Alloys

Cited by 37 publications

References 17 publications

Thermodynamic Modeling of the Undercooled Liquid in the Ni–Zr System

Thermodynamic Modeling of the Undercooled Liquid in the Ni–Zr System

Temperature dependence of the mixing enthalpy and excess heat capacity in the liquid system nickel-zirconium

Thermodynamic Analysis of the Phase Equilibria in the Nb-Ni-Zr System

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Calorimetric Determination of the Enthalpies of Formation of Liquid Ni-Zr Alloys

Cited by 37 publications

References 17 publications

Thermodynamic Modeling of the Undercooled Liquid in the Ni&ndash;Zr System

Thermodynamic Modeling of the Undercooled Liquid in the Ni&ndash;Zr System

Temperature dependence of the mixing enthalpy and excess heat capacity in the liquid system nickel-zirconium

Thermodynamic Analysis of the Phase Equilibria in the Nb-Ni-Zr System

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Product

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Thermodynamic Modeling of the Undercooled Liquid in the Ni–Zr System

Thermodynamic Modeling of the Undercooled Liquid in the Ni–Zr System