Enhancement of the microstructure and elevated temperature mechanical properties of as-cast Mg-Al2Ca-Mg2Ca in-situ composite by hot extrusion
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F19%3A10406560" target="_blank" >RIV/00216208:11320/19:10406560 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=-_hv-EW.ZX" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=-_hv-EW.ZX</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.matchar.2018.10.018" target="_blank" >10.1016/j.matchar.2018.10.018</a>
Alternative languages
Result language
angličtina
Original language name
Enhancement of the microstructure and elevated temperature mechanical properties of as-cast Mg-Al2Ca-Mg2Ca in-situ composite by hot extrusion
Original language description
Mechanical properties of Mg-Al-Ca in-situ composite in the as-cast state and after hot deformation (by extrusion process) were evaluated and discussed based on the detailed microstructural analysis. The as-cast microstructure, containing alpha-Mg, primary Al2Ca particles, and eutectic cells (alpha-Mg + Mg2Ca and alpha-Mg + Al2Ca), showed poor room temperature mechanical properties due to the presence of a large fraction of intermetallic phases with unfavorable morphology. The extrusion process resulted in a grain-refined microstructure introduced by dynamic recrystallization (DRX) accompanied with homogeneously distributed fragmented inter metallic particles. It was shown that the grain size of extruded specimens decreases with decreasing deformation temperature (decreasing the Zener-Hollomon parameter) and increasing extrusion ratio. Based on the electron backscattered diffraction (EBSD) analysis, the particle-stimulated nucleation (PSN) was characterized to be a major recrystallization mechanism during hot extrusion of Mg-Al2Ca-Mg2Ca composite. The room temperature, tensile properties of the as-cast composite were comparable to those obtained for the as-cast AZ91 (Mg-9Al-1Zn) alloy. The mechanical properties of the composite were significantly enhanced by the hot extrusion process. Moreover, the results of the tensile tests at 300 degrees C revealed that the tensile strength of the extruded Mg-Al2Ca-Mg2Ca composite is much higher than that of the extruded AZ91 alloy. Such improvement was related to the presence of thermally stable intermetallic phases in the composite microstructure. As a result, the designed Mg-Al2Ca-Mg2Ca composite might be suitable for use in high-temperature structures, where many commercial alloys are not applicable.
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
<a href="/en/project/GB14-36566G" target="_blank" >GB14-36566G: Multidisciplinary research centre for advanced materials</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Materials Characterization
ISSN
1044-5803
e-ISSN
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Volume of the periodical
147
Issue of the periodical within the volume
1
Country of publishing house
US - UNITED STATES
Number of pages
10
Pages from-to
155-164
UT code for WoS article
000457510100017
EID of the result in the Scopus database
2-s2.0-85056177815