Characterization of phase development in commercial Al-Zn-Mg(-Mn,Fe) alloy with and without Sc,Zr-addition

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10388103" target="_blank" >RIV/00216208:11320/18:10388103 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.4149/km_2018_6_367" target="_blank" >https://doi.org/10.4149/km_2018_6_367</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.4149/km_2018_6_367" target="_blank" >10.4149/km_2018_6_367</a>

Result language
angličtina
Original language name
Characterization of phase development in commercial Al-Zn-Mg(-Mn,Fe) alloy with and without Sc,Zr-addition
Original language description
Precipitation reactions of the Al-Zn-Mg(-Mn,Fe)-based alloys with/without Sc,Zr-addition were studied by microhardness and resistivity measurements, and differential scanning calorimetry. Microstructure observation proved the Zn,Mg-containing eutectic phase at grain boundaries. Positron spectroscopy confirmed the presence of Guinier-Preston (GP) zones in the initial state. The changes in resistivity and microhardness curves as well as in heat flow are mainly caused by the formation and/or dissolution of the Guinier-Preston zones and precipitation of the particles from the Al-Zn-Mg system. Formation of the Mn,Fe-containing particles as well as of the eta- and T-phase does not influence hardening significantly. The hardening effect above similar to 300 degrees C reflects the Sc,Zr-addition. Heat treatment at 300 degrees C for 60 min and 460 degrees C for 45 min is insufficient for homogenization of the alloys. The apparent activation energy values were calculated: dissolution of the GP zones (similar to 106 kJ mol(-1)), formation of the metastable eta'-phase (similar to 111 kJ mol(-1)), formation of the stable eta-phase (similar to 126 kJ mol(-1)) and formation of the T-phase (similar to 144 kJ mol(-1)).
Czech name
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Czech description
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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.)

Project
<a href="/en/project/GA17-17139S" target="_blank" >GA17-17139S: Direct and indirect influence of Sc and Zr on early precipitation stages in advanced lightweight structural Al alloys</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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