Low temperature superplasticity of the ECAP Al7075-based alloy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10389819" target="_blank" >RIV/00216208:11320/18:10389819 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/18:00499911

Výsledek na webu

<a href="https://doi.org/10.22226/2410-3535-2018-4-549-553" target="_blank" >https://doi.org/10.22226/2410-3535-2018-4-549-553</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.22226/2410-3535-2018-4-549-553" target="_blank" >10.22226/2410-3535-2018-4-549-553</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Low temperature superplasticity of the ECAP Al7075-based alloy

Popis výsledku v původním jazyce

Using equal channel angular pressing (ECAP) at 120 degrees C, a sub-microcrystalline structure was prepared in the Al7075 alloy modified by the addition of 0.2 wt. % Sc and 0.11 wt. % Zr. This relatively low ECAP temperature resulted in a very fine grain size of 0.5 mu m, however, this microstructure was not stable and a grain growth started already at 300 degrees C. Consequently, the superplastic behaviour was not observed at temperatures above 400 degrees C which are typical for the Al7075-type alloys. The tensile tests performed at temperatures below 300 degrees C revealed enhanced ductility -elongation exceeding 300 % was observed in this material already at 200 degrees C. In order to verify whether such behaviour can be considered as so called &quot;low temperature superplasticity&quot;, a microstructure investigation was performed using scanning electron microscopy, electron back scatter diffraction, transmission electron microscopy, and atom force microscopy. These experiments revealed that the deformation mechanism was similar to that observed in &quot;true&quot; superplasticity. Grain boundary sliding played still an active role. The elongation of individual grains during straining was significantly lower in comparison with the overall sample elongation, nevertheless it documented the contribution of dislocation slip to the deformation mechanism.

Název v anglickém jazyce

Low temperature superplasticity of the ECAP Al7075-based alloy

Popis výsledku anglicky

Using equal channel angular pressing (ECAP) at 120 degrees C, a sub-microcrystalline structure was prepared in the Al7075 alloy modified by the addition of 0.2 wt. % Sc and 0.11 wt. % Zr. This relatively low ECAP temperature resulted in a very fine grain size of 0.5 mu m, however, this microstructure was not stable and a grain growth started already at 300 degrees C. Consequently, the superplastic behaviour was not observed at temperatures above 400 degrees C which are typical for the Al7075-type alloys. The tensile tests performed at temperatures below 300 degrees C revealed enhanced ductility -elongation exceeding 300 % was observed in this material already at 200 degrees C. In order to verify whether such behaviour can be considered as so called &quot;low temperature superplasticity&quot;, a microstructure investigation was performed using scanning electron microscopy, electron back scatter diffraction, transmission electron microscopy, and atom force microscopy. These experiments revealed that the deformation mechanism was similar to that observed in &quot;true&quot; superplasticity. Grain boundary sliding played still an active role. The elongation of individual grains during straining was significantly lower in comparison with the overall sample elongation, nevertheless it documented the contribution of dislocation slip to the deformation mechanism.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

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

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Letters on Materials

ISSN

2218-5046

e-ISSN

—

Svazek periodika

8

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

RU - Ruská federace

Počet stran výsledku

5

Strana od-do

549-553

Kód UT WoS článku

000457554700008

EID výsledku v databázi Scopus

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