Superior low-temperature superplasticity in fine-grained ZK60 Mg alloy sheet produced by a combination of repeated upsetting process and sheet extrusion

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F21%3A10437612" target="_blank" >RIV/00216208:11320/21:10437612 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=UUozFEq6FX" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=UUozFEq6FX</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.msea.2021.141444" target="_blank" >10.1016/j.msea.2021.141444</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Superior low-temperature superplasticity in fine-grained ZK60 Mg alloy sheet produced by a combination of repeated upsetting process and sheet extrusion

Popis výsledku v původním jazyce

Fine-grained magnesium alloy sheets are potential candidates for superplastic forming applications. In the present study, the ZK60 Mg alloy sheet was obtained by a combination of repeated upsetting (RU) process, as a severe plastic deformation method, and subsequent forward sheet extrusion. Performing extrusion on the specimens processed by 1 and 5 passes of RU resulted in sheets with average grain sizes smaller than 10 mu m, and a basal texture component. The sheet produced by 5 passes of RU and subsequent extrusion (denoted as A5RE) showed low-temperature superplasticity with the strain rate sensitivity index (m-value) of 0.57 and 0.62 at 523 K and 573 K, respectively. The microstructural characterization revealed that a fully recrystallized (VDRX = 96%) fine-grained microstructure containing a large volume fraction of high-angle grain boundaries (HAGBs) of 80.5%, together with the presence of thermally stable secondary phase particles, are the main reasons for achieving the superplasticity in the A5RE condition. The m-value greater than 0.5 and activation energy of 106 kJ/mol calculated for this condition indicate the grain boundary sliding (GBS), accommodated by grain boundary diffusion, as the dominant deformation mechanism during superplastic forming.

Název v anglickém jazyce

Superior low-temperature superplasticity in fine-grained ZK60 Mg alloy sheet produced by a combination of repeated upsetting process and sheet extrusion

Popis výsledku anglicky

Fine-grained magnesium alloy sheets are potential candidates for superplastic forming applications. In the present study, the ZK60 Mg alloy sheet was obtained by a combination of repeated upsetting (RU) process, as a severe plastic deformation method, and subsequent forward sheet extrusion. Performing extrusion on the specimens processed by 1 and 5 passes of RU resulted in sheets with average grain sizes smaller than 10 mu m, and a basal texture component. The sheet produced by 5 passes of RU and subsequent extrusion (denoted as A5RE) showed low-temperature superplasticity with the strain rate sensitivity index (m-value) of 0.57 and 0.62 at 523 K and 573 K, respectively. The microstructural characterization revealed that a fully recrystallized (VDRX = 96%) fine-grained microstructure containing a large volume fraction of high-angle grain boundaries (HAGBs) of 80.5%, together with the presence of thermally stable secondary phase particles, are the main reasons for achieving the superplasticity in the A5RE condition. The m-value greater than 0.5 and activation energy of 106 kJ/mol calculated for this condition indicate the grain boundary sliding (GBS), accommodated by grain boundary diffusion, as the dominant deformation mechanism during superplastic forming.

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

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Materials Science &amp; Engineering A: Structural Materials: Properties, Microstructure and Processing

ISSN

0921-5093

e-ISSN

—

Svazek periodika

819

Číslo periodika v rámci svazku

05

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

12

Strana od-do

141444

Kód UT WoS článku

000668725800004

EID výsledku v databázi Scopus

2-s2.0-85107151637