Superior low-temperature superplasticity in fine-grained ZK60 Mg alloy sheet produced by a combination of repeated upsetting process and sheet extrusion
The result's identifiers
Result code in 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>
Result on the web
<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>
Alternative languages
Result language
angličtina
Original language name
Superior low-temperature superplasticity in fine-grained ZK60 Mg alloy sheet produced by a combination of repeated upsetting process and sheet extrusion
Original language description
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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
ISSN
0921-5093
e-ISSN
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Volume of the periodical
819
Issue of the periodical within the volume
05
Country of publishing house
CH - SWITZERLAND
Number of pages
12
Pages from-to
141444
UT code for WoS article
000668725800004
EID of the result in the Scopus database
2-s2.0-85107151637