Determination of the enthalpy of mixing of liquid alloys using a high-temperature mixing calorimeter

Stolz, U.; Arpshofen, Ingo; Sommer, F.; Predel, B.

doi:10.1007/bf02671966

Cited by 88 publications

(48 citation statements)

References 11 publications

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“…4); its maximum reaches ΔH max = 3.9 ± 0.6 kJ/mole near the equiatomic composition. Figure 4 shows that the integral mixing enthalpies of copper and nickel assessed in [17,18,20,21] agree well. The ΔH values reported in [4] are less endothermic.…”

Section: Fig 5 Thermodynamic Activities Of Liquid Alloy Componentssupporting

confidence: 54%

“…Integral mixing enthalpy was determined for four alloys with x Ni = 0.601-0.911 at 1739 K in [20]. The results are presented in Fig.…”

Section: Thermodynamic Properties Of Liquid Alloysmentioning

confidence: 99%

“…The mixing enthalpies of copper and nickel in liquid alloys were examined with calorimetric methods in [4,[14][15][16][17][18][19][20][21]. The mixing enthalpy of components was first studied in copper-rich melts: in [14] at x Ni = 0-0.09 and 1473 K, in [15] at 1473 K and x Ni = 0-0.15.…”

Section: Thermodynamic Properties Of Liquid Alloysmentioning

confidence: 99%

“…The model parameters A i and B i were optimized with the Thermo-Calc software. The phase diagram of the system is relatively simple and, therefore, most of the above experimental data could be accepted in the first stage of calculations for optimization: on phase equilibria [2][3][4][5]; thermodynamic properties of melts [4,14,15,[17][18][19][20][21][23][24][25]; thermodynamic properties of hard alloys [27,[29][30][31][32][33][34][35]. The data [16,28] on the formation enthalpies of liquid and solid alloys, respectively, were not included in the optimization.…”

Section: Thermodynamic Models and Optimization Of The Systemmentioning

confidence: 99%

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Phase equilibria and thermodynamics of binary copper systems with 3d-metals. VI. Copper-nickel system

Турчанин

Agraval

Abdulov

2007

Powder Metall Met Ceram

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669.35:536.717 Thermodynamic evaluation of the Cu-Ni system within the CALPHAD approach is based on values of mixing enthalpies and activities of components in liquid and solid solutions, as well as parameters of phase transformations. The excess Gibbs free energy of phases is described by the following equations:mole for liquid alloy and ΔG (Cu, Ni), ex = x Ni (1 -x Ni )× × (6877.12 + 4.6T + (1-2x Ni )(-2450.1 + 1.87T)) J/mole for fcc solution. For the Gibbs free energy of the (Cu, Ni) phase, the magnetic effect is described by the Hillert-Jarl method. The thermodynamic model of the system generates a self-consistent description of all thermodynamic values and phase equilibria. The calculated binodale of fcc solid solution is in satisfactory agreement with experimental data. The critical point have coordinates 605 K and x Ni = 0.6.Binary copper-nickel alloys and more complex composites based on them have important mechanical and electrical properties and demonstrate high corrosion resistance in different environments. That is why they are widely used in contemporary industry as structural and electrotechnical materials. Therefore, studying the interaction of copper and nickel is an important task. Processes for extracting these valuable metals from secondary raw materials are another significant application. In this regard, the phase diagram of the system and thermodynamic properties of its phases attracted the close attention of experimenters and were repeatedly subjected to thermodynamic modeling. However, the published data on thermodynamic mixing functions demonstrate substantial differences both in the absolute value and temperature dependence, and phase equilibria in the low-temperature region cannot be considered fully understood. PHASE EQUILIBRIA IN THE SYSTEMThe system components show complete liquid and solid miscibility. Hence, there are two phases in equilibrium: liquid L and fcc solution (Cu, Ni). The existence of the solid solution was confirmed with optical microscopy and x-ray examination. The solidus and liquidus lines form a cigar-shaped phase diagram with a narrow two-phase region. Different research teams invariably arrived at similar conclusions. The results of research efforts up to 1958 were analyzed in [1].Contemporary studies of the phase equilibria in the system [2][3][4][5] focus of the positioning of the liquidus and solidus lines (Figs. 1 and 2). The papers [2, 3, 5] used for this purpose an x-ray spectral microanalysis of samples quenched from the two-phase region. In addition, the paper [3] established the position of the liquidus line with a thermal analysis followed by extrapolating the data to the zero cooling rate. The measurements made in [3] cover the entire concentration range, the data from [2] the region of copper-rich alloys, and the data from [5] alloys with x Ni < 0.30 and x Ni > 0.70. The paper [4] studies the phase equilibrium between the liquid and solid solutions with a thermal analysis of seven alloy compositions in the range x Ni = 0.01-0.87.Donbass State Mech...

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Section: Fig 5 Thermodynamic Activities Of Liquid Alloy Componentssupporting

confidence: 54%

“…Integral mixing enthalpy was determined for four alloys with x Ni = 0.601-0.911 at 1739 K in [20]. The results are presented in Fig.…”

Section: Thermodynamic Properties Of Liquid Alloysmentioning

confidence: 99%

Section: Thermodynamic Properties Of Liquid Alloysmentioning

confidence: 99%

Section: Thermodynamic Models and Optimization Of The Systemmentioning

confidence: 99%

See 2 more Smart Citations

Phase equilibria and thermodynamics of binary copper systems with 3d-metals. VI. Copper-nickel system

Турчанин

Agraval

Abdulov

2007

Powder Metall Met Ceram

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“…In a series of articles, we have reported in detail the thermodynamic properties of liquid SINCE the Al-Cu-Ni-Zr system is a basis for the producAl-Cu, Al-Ni, Cu-Ni, [5] Cu-Zr, [3] Al-Zr, [4] Al-Cu-Ni, [6] and tion of bulk amorphous materials by rapid solidification Al-Cu-Zr [4] alloys. This article deals with the direct caloritechniques from the liquid state, [1,2] it is of great scientific metric measurements of the partial and the integral enthalinterest to determine the partial and the integral thermodypies of mixing of liquid Ni-Zr and Cu-Ni-Zr alloys and the namic functions of liquid and undercooled liquid alloys.…”

Section: Introductionmentioning

confidence: 99%

Enthalpy of mixing of liquid Ni-Zr and Cu-Ni-Zr alloys

Witusiewicz

Sommer

2000

Metall Mater Trans B

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The enthalpy of formation and the heat capacity of liquid and undercooled liquid Al‐Cu‐La alloys

Zhou

Sommer

1998

Ber Bunsenges Phys Chem

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The integral enthalpy of mixing δH of liquid lanthanum‐rich and aluminium‐rich Al‐Cu‐La alloys was determined by solution calorimetry at 1078 K. An adiabatic calorimeter was used to measure the heat capacity Cp of liquid Al25Cu20La55 and Cu67La33 alloys. The association model was applied to calculate the thermodynamic functions of liquid Al‐Cu‐La alloys using the model parameter of the three limiting binary alloys. The results show systematic positive deviations from the experimental data. An additional ternary association reaction was assumed with a stoichiometry near to the composition of maximum deviation between calculated and experimental ΔH values. The new description reveals a good agreement with the experimental ΔH(x, 1078) and the Cp(x, T) data. The calculated Cp(T) curve of the undercooled liquid Al25La55Cu20 alloy exhibits a maximum.

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Determination of the enthalpy of mixing of liquid alloys using a high-temperature mixing calorimeter

Cited by 88 publications

References 11 publications

Phase equilibria and thermodynamics of binary copper systems with 3d-metals. VI. Copper-nickel system

Phase equilibria and thermodynamics of binary copper systems with 3d-metals. VI. Copper-nickel system

Enthalpy of mixing of liquid Ni-Zr and Cu-Ni-Zr alloys

The enthalpy of formation and the heat capacity of liquid and undercooled liquid Al‐Cu‐La alloys

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