Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 24, Issue 5, Pages 1481-1487Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(14)63216-7
Keywords
thermodynamic calculation; high-zinc alloy; Al-Zn-Mg-Cu; calculation of phase diagram (CALPHAD)
Categories
Funding
- National Basic Research Program of China [2012CB619504]
- National Natural Science Foundation of China [51271037]
- International Scientific and Technological Cooperation Projects of China [2010DFB50340]
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Phase fraction and solidification path of high Zn-containing Al-Zn-Mg-Cu series aluminum alloy were calculated by calculation of phase diagram (CALPHAD) method. Microstructure and phases of Al-9.2Zn-1.7Mg-2.3Cu alloy were studied by X-ray diffraction (XRD), differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). The calculation results show that eta(MgZn2) phase is influenced by Zn and Mg. Mass fractions of eta(MgZn2) in Al-xZn-1.7Mg-2.3Cu are 10.0%, 9.8% and 9.2% for x=9.6, 9.4, 8.8 (mass fraction, %), respectively. The intervals of Mg composition were achieved for theta(Al2Cu)+eta(MgZn2), S(Al2CuMg)+eta(MgZn2) and theta(Al2Cu)+S(Al2CuMg)+eta(MgZn2) phase regions. Al3Zr, alpha(Al), Al13Fe4, eta(MgZn2), alpha-AlFeSi, Al7Cu2Fe, theta(Al2Cu), Al5Cu2Mg8Si6 precipitate in sequence by no-equilibrium calculation. The SEM and XRD analyses reveal that alpha(Al), eta(MgZn2), Mg(Al,Cu,Zn)(2), theta(Al2Cu) and Al7Cu2Fe phases are discovered in Al-9.2Zn-1.7Mg-2.3Cu alloy. The thermodynamic calculation can be used to predict the major phases present in experiment.
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