Response of as-cast Al-Zn-Mg alloy with and without Sc, Zr addition to annealing with constant heating rate
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10368218" target="_blank" >RIV/00216208:11320/17:10368218 - isvavai.cz</a>
Výsledek na webu
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DOI - Digital Object Identifier
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Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Response of as-cast Al-Zn-Mg alloy with and without Sc, Zr addition to annealing with constant heating rate
Popis výsledku v původním jazyce
The as-cast Al-Zn-Mg-based alloy with and without Sc, Zr-addition was investigated during isochronal annealing from room temperature up to 480 °C. Precipitation reactions were studied by electrical resistometry, microhardness measurements and differential scanning calorimetry. These measurements were compared to microstructure development that was observed by optical microscopy and transmission and scanning electron microscopy. Microstructure observation proved the Zn, Mg-containing eutectic phase at grain boundaries in the as-cast state of both alloys. It was also observed that the Sc, Zr-content is not homogeneously distributed but concentrated in randomly localized matrix regions and together with Zn and Mg in the particles at grain boundaries. The distinct changes in resistivity and microhardness curves as well as in heat flow of the alloys studied are mainly caused by dissolution of the Zn, Mg-containing Guinier-Preston (GP) zones and subsequent precipitation of the metastable particles from the Al-Zn-Mg system. The hardening effect after isochronal annealing at temperatures above ~ 280 °C reflects the Sc, Zr-addition. The eutectic Zn, Mg-containing phase partly disappeared during the isochronal annealing above this temperature. Precipitation of the Mn,Fecontaning particles was also observed in the alloys. The apparent activation energy values were calculated regardless of Sc, Zr- addition as: dissolution of the GP zones (~ 100 kJ/mol) and formation of the metastable Zn, Mg-containing particles (~ 100 kJ/mol). Melting of the eutectic phase was observed by differential scanning calorimetry at ~ 475 °C.
Název v anglickém jazyce
Response of as-cast Al-Zn-Mg alloy with and without Sc, Zr addition to annealing with constant heating rate
Popis výsledku anglicky
The as-cast Al-Zn-Mg-based alloy with and without Sc, Zr-addition was investigated during isochronal annealing from room temperature up to 480 °C. Precipitation reactions were studied by electrical resistometry, microhardness measurements and differential scanning calorimetry. These measurements were compared to microstructure development that was observed by optical microscopy and transmission and scanning electron microscopy. Microstructure observation proved the Zn, Mg-containing eutectic phase at grain boundaries in the as-cast state of both alloys. It was also observed that the Sc, Zr-content is not homogeneously distributed but concentrated in randomly localized matrix regions and together with Zn and Mg in the particles at grain boundaries. The distinct changes in resistivity and microhardness curves as well as in heat flow of the alloys studied are mainly caused by dissolution of the Zn, Mg-containing Guinier-Preston (GP) zones and subsequent precipitation of the metastable particles from the Al-Zn-Mg system. The hardening effect after isochronal annealing at temperatures above ~ 280 °C reflects the Sc, Zr-addition. The eutectic Zn, Mg-containing phase partly disappeared during the isochronal annealing above this temperature. Precipitation of the Mn,Fecontaning particles was also observed in the alloys. The apparent activation energy values were calculated regardless of Sc, Zr- addition as: dissolution of the GP zones (~ 100 kJ/mol) and formation of the metastable Zn, Mg-containing particles (~ 100 kJ/mol). Melting of the eutectic phase was observed by differential scanning calorimetry at ~ 475 °C.
Klasifikace
Druh
D - Stať ve sborníku
CEP obor
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OECD FORD obor
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Návaznosti výsledku
Projekt
<a href="/cs/project/GA17-17139S" target="_blank" >GA17-17139S: Přímý a nepřímý vliv Sc a Zr na raná precipitační stádia v moderních lehkých konstrukčních Al slitinách</a><br>
Návaznosti
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Ostatní
Rok uplatnění
2017
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název statě ve sborníku
METAL 2017 Conference Proceedings
ISBN
978-80-87294-79-6
ISSN
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e-ISSN
neuvedeno
Počet stran výsledku
6
Strana od-do
1769-1774
Název nakladatele
Tanger Ltd.
Místo vydání
Ostrava
Místo konání akce
Brno
Datum konání akce
24. 5. 2017
Typ akce podle státní příslušnosti
WRD - Celosvětová akce
Kód UT WoS článku
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