EFFECT OF HEAT TREATMENT ON MECHANICAL, THERMAL AND ELECTRICAL PROPERTIES OF AL-ZN-MG-CU(-SC-ZR) ALLOYS
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F19%3A10405293" target="_blank" >RIV/00216208:11320/19:10405293 - isvavai.cz</a>
Result on the web
—
DOI - Digital Object Identifier
—
Alternative languages
Result language
angličtina
Original language name
EFFECT OF HEAT TREATMENT ON MECHANICAL, THERMAL AND ELECTRICAL PROPERTIES OF AL-ZN-MG-CU(-SC-ZR) ALLOYS
Original language description
The as-cast commercial Al-6wt.%Zn-2.5wt.%Mg-1.3wt.%Cu-0.8wt.%Fe,Si,Cr (AA7075) and AA7075-ScZr (0.19wt.%Sc-0.06wt.%Zr) alloys were investigated during isochronal annealing from room temperature up to 450 °C. Precipitation reactions were studied by microhardness, conductivity measurements and differential scanning calorimetry. Microstructure observation by scanning electron microscopy and transmission electron microscopy proved the Zn,Mg,Cu-containing eutectic phase at grain boundaries in the as-cast state of both alloys. The melting of this eutectic phase was observed for both alloys at ~ 480 °C in the DSC curves at heating rate of 20 K/min. The distinct changes in microhardness and conductivity curves as well as in heat flow of the alloys studied are mainly caused by dissolution of GP zones and by formation of the metastable phase particles of the Al-Zn-Mg-Cu system. The hardening effect after isochronal annealing at temperatures above ~ 270 °C reflects the Sc,Zr-addition in the AA7075-ScZr alloy - the secondary Al3(Sc,Zr) particles precipitation causes a pronounced hardening in the temperature range of 270-450 °C. The eutectic Zn,Mg,Cu-containing phase partly disappeared after the isochronal annealing at 450 °C as it was observed by scanning electron microscopy.
Czech name
—
Czech description
—
Classification
Type
D - Article in proceedings
CEP classification
—
OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Result continuities
Project
<a href="/en/project/GA17-17139S" target="_blank" >GA17-17139S: Direct and indirect influence of Sc and Zr on early precipitation stages in advanced lightweight structural Al alloys</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
Conference proceedings
ISBN
978-80-87294-92-5
ISSN
—
e-ISSN
—
Number of pages
6
Pages from-to
1589-1594
Publisher name
Tanger Ltd.
Place of publication
Ostrava
Event location
Brno
Event date
May 22, 2019
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
—