Experimental investigation and thermodynamic calculation of the Al–Mg–Zn system

Liang, Peng; Tarfa, T.; Robinson, J A J; Wagner, S.; Ochin, P.; Harmelin, M.; Seifert, Hans Jürgen; Lukas, Hans Léo; Aldinger, Fritz

doi:10.1016/s0040-6031(97)00458-9

Cited by 209 publications

(87 citation statements)

References 22 publications

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“…In 7xxx alloys this concerns mainly the S (Al 2 CuMg), T (Mg 3 Zn 3 Al 2 with some Cu dissolved in it), Al 7 Cu 2 Fe and Mg 2 Si phases [27,31,32], where the presence of the latter two is caused by impurities Fe and Si. The amounts of each phase present can be calculated/predicted using thermodynamic models [33,34] or phase diagrams [35]. For the present work, T and Mg 2 Si are neglected because previous work [16,36] has indicated that they are either not present or only present in limited amounts in commercial 7xxx alloys.…”

Section: Undissolved Particlesmentioning

confidence: 99%

A model for the electrical conductivity of peak-aged and overaged Al-Zn-Mg-Cu alloys

Starink

2003

Metall Mater Trans A

112

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A physically-based model for the electrical conductivity of peak aged and overaged Al-Zn-Mg-Cu (7xxx series) alloys is presented. The model includes calculations of the η and the S phase solvus (using a regular solution model), taking account of the capillary effect and η coarsening. It takes account of the conductivity of grains (incorporating dissolved alloying elements, undissolved particles and precipitates) and solute depleted areas at the grain boundaries. Data from optical microscopy, differential scanning calorimetry (DSC), scanning electron microscopy (SEM) along with energy dispersive X-ray spectrometry (EDS), and transmission electron microscopy (TEM) are consistent with the model and its predictions. The model has been successfully used to fit and predict the conductivity data of a set of 7xxx alloys including both Zr containing alloys and Cr containing alloys under various ageing conditions, achieving an accuracy of about 1% in predicting unseen conductivity data from this set of alloys.

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Section: Undissolved Particlesmentioning

confidence: 99%

A model for the electrical conductivity of peak-aged and overaged Al-Zn-Mg-Cu alloys

Starink

2003

Metall Mater Trans A

112

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“…The updates on the previously reviewed Al-Mg-Sc system show an isothermal section at 350°C, three vertical sections [2007Rag1] and a liquidus projection [2008Rag], all from the computed results of [1999Gro]. The update of [2007Rag2] on the Al-Mg-Zn system reviewed the computed results of [1997Lia] and presented a liquidus projection, an isothermal section at 335°C and six vertical sections. In the Al-Sc-Zn system (updated in this issue), a ternary eutectic reaction occurs in the Al-rich region at 367°C, yielding (Al) + (Zn) + ScAl 3 .…”

Section: Lower Order Systemsmentioning

confidence: 99%

“…The phase distribution is similar at the two temperatures, with two four-phase fields of (Al) + ScAl 3 + Mg 2 Al 3 + s and ðAlÞ þ ScAl 3 þ MgZn 2 þ s: The solubility of Mg and Zn in ScAl 3 is $0 and 5 mass%, respectively. The ternary phase sðAl 2 Mg 3 Zn 3 ; cubic Im " 3) was denoted as T-(Al,Zn) 49 A vertical section at 5.0Mg-0.5Sc (mass%) was constructed by [2001Fri] in the Al-rich region of this quaternary system . …”

Section: Quaternary Phase Equilibriamentioning

confidence: 99%

“…

Lower Order Systems

Phase diagrams of the relevant binary systems can be found in [

Quaternary Phase Equilibria

With starting metals of 99.99% Al, 99.96% Mg, 99.86% Sc, and 99.99% Zn, [2008Rok] prepared quaternary alloys containing a constant content of Sc of 0.5 mass% and Mg and Zn contents up to 20 mass%.

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mentioning

confidence: 99%

“…There are a couple of reports on the phase equilibria in Al-rich alloys of this quaternary system [2001Fri, 2008Rok]. Isothermal sections at a constant Sc content of 0.5 mass% and at 430 and 300°C were reported by .…”

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confidence: 99%

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Al-Mg-Sc-Zn (Aluminum-Magnesium-Scandium-Zinc)

Raghavan¹

2009

J. Phase Equilib. Diffus.

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There are a couple of reports on the phase equilibria in Al-rich alloys of this quaternary system [2001Fri, 2008Rok]. Isothermal sections at a constant Sc content of 0.5 mass% and at 430 and 300°C were reported by . Lower Order SystemsPhase diagrams of the relevant binary systems can be found in [ Quaternary Phase EquilibriaWith starting metals of 99.99% Al, 99.96% Mg, 99.86% Sc, and 99.99% Zn, [2008Rok] prepared quaternary alloys containing a constant content of Sc of 0.5 mass% and Mg and Zn contents up to 20 mass%. The alloys were given a final anneal at 430°C for 100 h or at 300°C for 200 h, followed by water quenching. The phase equilibria were studied by optical microscopy, x-ray powder diffraction, and electron probe microanalysis. The isothermal sections at 0.

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Phase Equilibria, Phase Diagrams, and Phase Modeling

2005

Principles of Inorganic Materials Design

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Phase diagrams, phase equilibria data in graphical form, are a standard tool of materials scientists and engineers. Such compilations of data can be indispensable when, for example, there are questions about the thermodynamic stability of a phase under a given set of working conditions, or in a particular operating environment (e.g., materials compatibility issues). The easiest way for a metallurgical engineer to determine whether an aluminum or tungsten vessel would be the best choice as a container for molten zinc is to consult the Al-Zn and W-Zn phase diagrams. In this particular case, the phase diagrams would show that Al-Zn alloy formation would be expected to occur since zinc exhibits an increasing solid solubility in aluminum with temperature, whereas tungsten is much more resistant to corrosion by molten zinc.The solid-state chemist interested in preparing new materials also finds phase diagrams valuable. Strictly speaking, phase diagrams describe the phase relationships within single-component or multicomponent systems in stable thermodynamic equilibrium. Hence, the phase diagram tells us if a given phase in that system will be accessible under those equilibrium conditions (although metastable phases certainly may be obtainable under appropriate circumstances). Even when a stable phase is accessible, control of the stoichiometry may be difficult to achieve due to complex phase equilibria. For example, many transition metals have a propensity to adjust their oxidation state depending on the temperature and oxygen partial pressure, which can result in a multiphase product (impurities) and/or one with mixed valency.It is imperative that one be able to properly interpret phase diagrams. In the first part of this chapter, we review some underlying concepts from thermodynamics necessary for understanding phase equilibria. The interpretation of phase diagrams is subsequently taken up. Afterwards, the reader is introduced to the calculation of phase diagrams (CALPHAD) method, in which phase equilibria predictions are made on high-order systems by extrapolation of thermochemical data from the Principles of Inorganic Materials Design

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Experimental investigation and thermodynamic calculation of the Al–Mg–Zn system

Cited by 209 publications

References 22 publications

A model for the electrical conductivity of peak-aged and overaged Al-Zn-Mg-Cu alloys

A model for the electrical conductivity of peak-aged and overaged Al-Zn-Mg-Cu alloys

Al-Mg-Sc-Zn (Aluminum-Magnesium-Scandium-Zinc)

Phase Equilibria, Phase Diagrams, and Phase Modeling

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