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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

  • DOI - Digital Object Identifier

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

  • 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

  • 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