METASTABLE PHASE DIAGRAM OF THE Al-Zn-Mg ALLOY SYSTEM IN THE LOW CONCENTRATION RANGE OF Zn AND Mg.

T. Ungár, J. Lendvai, I. Kovacs

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Abstract

A metastable phase diagram has been constructed for the Al-Zn-Mg alloy system in the 1-4. 5 at. % Zn and 1-3 at. % Mg concentration range. The following metastable phase boundaries were determined: the upper temperature limit of GP zone formation, GP//F, And of eta prime formation, eta prime //F, the highest temperature up to which the eta prime phase can exist in the matrix, eta prime s, the boundary for homogeneous-heterogeneous nucleation of the eta prime phase, eta prime //F//H and finally, the temperature at which GP zones formed during long-term RT aging dissolve, i. e. , the zone solvus for RT GP zones, GPs. It was found that the phase boundary of homogeneous-heterogeneous eta prime nucleation intersects the solvus line for RT GP zones at a temperature of 160 degree C and a Zn concentration of 2. 5 at. %. From this it was concluded that if the Zn content of an alloy is less than 2. 5 at. % the GP zones formed at RT dissolve completely during reversion before considerable eta prime formation can take place.

Original languageEnglish
Pages (from-to)663-668
Number of pages6
JournalAluminium Dusseldorf
Volume55
Issue number10
Publication statusPublished - Oct 1979

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Metastable phases
Phase diagrams
Phase boundaries
Nucleation
Temperature
Aging of materials

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METASTABLE PHASE DIAGRAM OF THE Al-Zn-Mg ALLOY SYSTEM IN THE LOW CONCENTRATION RANGE OF Zn AND Mg. / Ungár, T.; Lendvai, J.; Kovacs, I.

In: Aluminium Dusseldorf, Vol. 55, No. 10, 10.1979, p. 663-668.

Research output: Contribution to journalArticle

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N2 - A metastable phase diagram has been constructed for the Al-Zn-Mg alloy system in the 1-4. 5 at. % Zn and 1-3 at. % Mg concentration range. The following metastable phase boundaries were determined: the upper temperature limit of GP zone formation, GP//F, And of eta prime formation, eta prime //F, the highest temperature up to which the eta prime phase can exist in the matrix, eta prime s, the boundary for homogeneous-heterogeneous nucleation of the eta prime phase, eta prime //F//H and finally, the temperature at which GP zones formed during long-term RT aging dissolve, i. e. , the zone solvus for RT GP zones, GPs. It was found that the phase boundary of homogeneous-heterogeneous eta prime nucleation intersects the solvus line for RT GP zones at a temperature of 160 degree C and a Zn concentration of 2. 5 at. %. From this it was concluded that if the Zn content of an alloy is less than 2. 5 at. % the GP zones formed at RT dissolve completely during reversion before considerable eta prime formation can take place.

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