Annealing Effects in Conventionally Cast and Homogenized Al-Zn-Mg(-Sc-Zr) Alloy

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10368402" target="_blank" >RIV/00216208:11320/17:10368402 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.4028/www.scientific.net/DDF.380.167" target="_blank" >https://doi.org/10.4028/www.scientific.net/DDF.380.167</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.4028/www.scientific.net/DDF.380.167" target="_blank" >10.4028/www.scientific.net/DDF.380.167</a>

Result language

angličtina

Original language name

Annealing Effects in Conventionally Cast and Homogenized Al-Zn-Mg(-Sc-Zr) Alloy

Original language description

Al-based alloys are very preferred for automotive manufacture to produce lightweight vehicles. The positive effect of Sc,Zr-addition on the mechanical properties in Al-based alloys is generally known. Microstructure, mechanical, electrical and thermal properties of the conventionally cast and homogenized Al-Zn-Mg alloy with and without Sc,Zr-addition during isochronal annealing were studied. The electrical resistometry and microhardness together with differential scanning calorimetry measurements were compared to microstructure development that was observed by optical microscopy and transmission and scanning electron microscopy. It was observed that the Sc,Zr-content in the alloy after casting is not homogeneously distributed but concentrated in randomly localized matrix regions and together with Zn and Mg in the particles at grain boundaries. However, the hardening effect after annealing above 280 °C lightly reflects the Sc,Zr-addition. The distinct changes in resistivity and microhardness as well as in heat flow of the alloys studied are mainly caused by formation/dissolution of the Guinier-Preston zones and subsequent precipitation of the metastable particles from the Al-Zn-Mg system. The eutectic Zn,Mg-containing phase partly disappeared during the annealing above ~ 390 °C. Melting of the Zn,Mg-containing phase was observed at ~ 475 °C. The decomposition sequence of the supersaturated solid solution of the studied alloys is compatible with the decomposition sequence of the Al-Zn-Mg system minimally up to ~ 380 °C.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

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

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)

Publication year

2017

Confidentiality

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

Article name in the collection

Defect and Diffusion Forum

ISBN

978-3-0357-1347-3

ISSN

1012-0386

e-ISSN

neuvedeno

Number of pages

6

Pages from-to

167-172

Publisher name

Trans Tech Publications

Place of publication

Switzerland

Event location

Vienna

Event date

Jun 26, 2017

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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