Effect of Cold Rolling on Precipitation Processes in Al-Zn-Mg(-Sc-Zr) Alloy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F18%3A00325887" target="_blank" >RIV/68407700:21220/18:00325887 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/18:10388137

Výsledek na webu

<a href="http://dx.doi.org/10.12693/APhysPolA.134.631" target="_blank" >http://dx.doi.org/10.12693/APhysPolA.134.631</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.12693/APhysPolA.134.631" target="_blank" >10.12693/APhysPolA.134.631</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of Cold Rolling on Precipitation Processes in Al-Zn-Mg(-Sc-Zr) Alloy

Popis výsledku v původním jazyce

The effect of cold rolling (6% and 21%) on electrical, mechanical and thermal properties and microstructure of the classical mould-cast Al–Zn–Mg alloy with and without Sc,Zr-addition were studied. Samples were isochronally annealed up to 460 °C. Electrical resistivity and microhardness together with differential scanning calorimetry measurements were compared to microstructure development. The initial microhardness values of the alloys reflect the deformation degree. Distinct changes in electrical resistivity as well as in heat flow of the alloys studied are mainly caused by dissolution of Zn,Mg-rich Guinier–Preston zones and subsequent precipitation of the metastable 0 phase. Precipitation of this phase is responsible for a slight hardening effect. Probably an easier diffusion of Zn and Mg atoms along dislocations in the cold-rolled alloys is responsible for the dissolution of the Guinier–Preston zones and precipitation of the Zn,Mg-containing particles at the relatively lower temperatures in comparison to classical mould-cast alloys. Microstructure observation proved that the Sc,Zr-content is mainly concentrated in randomlylocalized regions in the Al matrix and together with Zn and Mg in the particles at grain boundaries. The hardening effect after annealing above 280 °C was observed in the AlZnMgScZr alloy. Microhardness decrease at temperatures above 350 °C in the alloys without Sc and Zr is probably connected with faster recovery processes. Cold rolling has no significant effect on the apparent activation energy values of the Guinier–Preston zones dissolution and formation of the Zn,Mg-containing particles.

Název v anglickém jazyce

Effect of Cold Rolling on Precipitation Processes in Al-Zn-Mg(-Sc-Zr) Alloy

Popis výsledku anglicky

The effect of cold rolling (6% and 21%) on electrical, mechanical and thermal properties and microstructure of the classical mould-cast Al–Zn–Mg alloy with and without Sc,Zr-addition were studied. Samples were isochronally annealed up to 460 °C. Electrical resistivity and microhardness together with differential scanning calorimetry measurements were compared to microstructure development. The initial microhardness values of the alloys reflect the deformation degree. Distinct changes in electrical resistivity as well as in heat flow of the alloys studied are mainly caused by dissolution of Zn,Mg-rich Guinier–Preston zones and subsequent precipitation of the metastable 0 phase. Precipitation of this phase is responsible for a slight hardening effect. Probably an easier diffusion of Zn and Mg atoms along dislocations in the cold-rolled alloys is responsible for the dissolution of the Guinier–Preston zones and precipitation of the Zn,Mg-containing particles at the relatively lower temperatures in comparison to classical mould-cast alloys. Microstructure observation proved that the Sc,Zr-content is mainly concentrated in randomlylocalized regions in the Al matrix and together with Zn and Mg in the particles at grain boundaries. The hardening effect after annealing above 280 °C was observed in the AlZnMgScZr alloy. Microhardness decrease at temperatures above 350 °C in the alloys without Sc and Zr is probably connected with faster recovery processes. Cold rolling has no significant effect on the apparent activation energy values of the Guinier–Preston zones dissolution and formation of the Zn,Mg-containing particles.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

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

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Acta Physica Polonica A

ISSN

0587-4246

e-ISSN

1898-794X

Svazek periodika

134

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

PL - Polská republika

Počet stran výsledku

5

Strana od-do

631-635

Kód UT WoS článku

000453257500005

EID výsledku v databázi Scopus

2-s2.0-85057752569