RESPONSE OF AS-CAST Al-Zn-Mg-Cu ALLOY WITH Sc,Zr-ADDITION TO ANNEALING WITH CONSTANT HEATING RATE

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10387967" target="_blank" >RIV/00216208:11320/18:10387967 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

RESPONSE OF AS-CAST Al-Zn-Mg-Cu ALLOY WITH Sc,Zr-ADDITION TO ANNEALING WITH CONSTANT HEATING RATE

Popis výsledku v původním jazyce

The as-cast Al-Zn-Mg-Cu-based alloy with and without Sc,Zr-addition was studied during isochronal annealing from room temperature up to 480 °C. Precipitation reactions were studied by differential scanning calorimetry and microhardness measurements. These measurements were compared to microstructure development that was observed by scanning electron microscopy. Microstructure observation proved eutectic phase at grain boundaries in the as-cast state of both alloys. The measurements of positron lifetime (LT) spectroscopy confirmed the presence of Guinier-Preston (GP) zones in the initial state of both studied alloys. Neither structure nor volume fracture of eutectic phase shows changes after annealing up to 480 °C. The distinct changes in microhardness curves as well as in heat flow of the alloys studied are mainly caused by dissolution of GP zones and by formation of the particles of the Al-Zn-Mg-Cu system. The apparent activation energy values of the thermal processes were calculated. The hardening effect after isochronal annealing at temperatures above ~ 300 °C reflects the Sc,Zr-addition.

Název v anglickém jazyce

RESPONSE OF AS-CAST Al-Zn-Mg-Cu ALLOY WITH Sc,Zr-ADDITION TO ANNEALING WITH CONSTANT HEATING RATE

Popis výsledku anglicky

The as-cast Al-Zn-Mg-Cu-based alloy with and without Sc,Zr-addition was studied during isochronal annealing from room temperature up to 480 °C. Precipitation reactions were studied by differential scanning calorimetry and microhardness measurements. These measurements were compared to microstructure development that was observed by scanning electron microscopy. Microstructure observation proved eutectic phase at grain boundaries in the as-cast state of both alloys. The measurements of positron lifetime (LT) spectroscopy confirmed the presence of Guinier-Preston (GP) zones in the initial state of both studied alloys. Neither structure nor volume fracture of eutectic phase shows changes after annealing up to 480 °C. The distinct changes in microhardness curves as well as in heat flow of the alloys studied are mainly caused by dissolution of GP zones and by formation of the particles of the Al-Zn-Mg-Cu system. The apparent activation energy values of the thermal processes were calculated. The hardening effect after isochronal annealing at temperatures above ~ 300 °C reflects the Sc,Zr-addition.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

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)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Conference proceedings

ISBN

978-80-87294-84-0

ISSN

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e-ISSN

neuvedeno

Počet stran výsledku

5

Strana od-do

1582-1586

Název nakladatele

Tanger Ltd.

Místo vydání

Ostrava

Místo konání akce

Brno

Datum konání akce

23. 5. 2018

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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