Thermodynamic Calculation of Al-Gd and Al-Gd-Mg Phase Equilibria Checked by Key Experiments
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J. Gröbner
Abstract
The binary Al–Gd and the ternary Al–Gd–Mg systems were calculated using the Calphad method. It is demonstrated that previous interpretation of ternary liquidus temperatures below 700 °C must be related to other phase equilibria. The actual ternary liquidus temperatures are much higher, up to some 600 °C above the previous interpretation in literature. They are widely governed by the high-melting compounds Al2Gd and Al3Gd with liquidus surfaces stretching far into the ternary system. A small number of key experiments in this work confirmed the calculated liquidus temperature and the phase relations. The available experimental data in literature fit excellently with the calculation in the binary Al–Gd system. In the ternary Al–Gd–Mg system, which is shown in several sections of the phase diagram, a good agreement can be observed too, considering the necessary reinterpretation of the liquidus temperatures suggested by Rokhlin et al. Ternary solubilities were not found experimentally. The ternary compound Al4GdMg (τ) forms in a ternary peritectic reaction at 761 °C.
This work is supported in the “Thrust Research Project SFB 390: Magnesium Technology” by the German Research Conci! (DFG).
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© 2001 Carl Hanser Verlag, München
Artikel in diesem Heft
- Frontmatter
- Editorial
- Editorial
- Aufsätze
- Metalle und Zeit – eine oft vergessene Problematik
- Precipitate Size Distribution in Alloys with and without Lattice Misfit
- The Ternary Ga–Ni–Sb System: Invariant Reactions and Liquidus Surface
- Thermodynamic Calculation of Al-Gd and Al-Gd-Mg Phase Equilibria Checked by Key Experiments
- Assessment of Diffusional Mobilities of Cr, Ni, and Si in fcc Cr–Ni–Si Alloys
- Quantitative Dilatometric Analysis of the Isothermal Decomposition of Hypereutectoid Fe–C Austenite
- The Excess Enthalpies of Liquid Ag-Sb-Te and Ag-Bi-Te Alloys
- Temperature Dependent Surface Tension of Binary Alloys: A Simple Model
- Micro-hardness Measurements to Evaluate Composition Gradients in Metal-Based Functionally Graded Materials
- Temperature Dependence of Lattice Parameter, Misfit and Thermal Expansion Coefficient of Matrix, γ′ Phase and Superalloy
- Einfluss der Umformgeschwindigkeit und -temperatur auf die Versagensgrenze von Aluminium AA7075
- Phenomenological and Microscopical Description of Scattering on Different Dislocation Arrangements
- Creep and Dislocation Structure in Copper Single Crystals Compressed in Directions [010], [110] and [111]
- Analysis of Average Orientation Distribution in Sheet Materials with Through-Thickness Texture Gradient
- Instructions to Authors/Hinweise für Autoren
- Instructions to authors
- Mitteilungen der Deutschen Gesellschaft für Materialkunde e.V.
- Personen
- Buchbesprechung
- Tagungskalender
Artikel in diesem Heft
- Frontmatter
- Editorial
- Editorial
- Aufsätze
- Metalle und Zeit – eine oft vergessene Problematik
- Precipitate Size Distribution in Alloys with and without Lattice Misfit
- The Ternary Ga–Ni–Sb System: Invariant Reactions and Liquidus Surface
- Thermodynamic Calculation of Al-Gd and Al-Gd-Mg Phase Equilibria Checked by Key Experiments
- Assessment of Diffusional Mobilities of Cr, Ni, and Si in fcc Cr–Ni–Si Alloys
- Quantitative Dilatometric Analysis of the Isothermal Decomposition of Hypereutectoid Fe–C Austenite
- The Excess Enthalpies of Liquid Ag-Sb-Te and Ag-Bi-Te Alloys
- Temperature Dependent Surface Tension of Binary Alloys: A Simple Model
- Micro-hardness Measurements to Evaluate Composition Gradients in Metal-Based Functionally Graded Materials
- Temperature Dependence of Lattice Parameter, Misfit and Thermal Expansion Coefficient of Matrix, γ′ Phase and Superalloy
- Einfluss der Umformgeschwindigkeit und -temperatur auf die Versagensgrenze von Aluminium AA7075
- Phenomenological and Microscopical Description of Scattering on Different Dislocation Arrangements
- Creep and Dislocation Structure in Copper Single Crystals Compressed in Directions [010], [110] and [111]
- Analysis of Average Orientation Distribution in Sheet Materials with Through-Thickness Texture Gradient
- Instructions to Authors/Hinweise für Autoren
- Instructions to authors
- Mitteilungen der Deutschen Gesellschaft für Materialkunde e.V.
- Personen
- Buchbesprechung
- Tagungskalender
