Experimental and theoretical investigation on refining mechanism of Mg2Si by Y addition in the Mg-Al-Si alloys

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F24%3A00587485" target="_blank" >RIV/68081723:_____/24:00587485 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S092583882402019X?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S092583882402019X?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jallcom.2024.175432" target="_blank" >10.1016/j.jallcom.2024.175432</a>

Result language

angličtina

Original language name

Experimental and theoretical investigation on refining mechanism of Mg2Si by Y addition in the Mg-Al-Si alloys

Original language description

Aiming at development of new lightweight and high-strength magnesium alloys, a combined experimental and ntheoretical study on refining mechanism of Mg2Si by Y addition in the Mg-Al-Si alloys was performed. Two nalloys, Mg63.32Al22.83Si13.85 and Mg62.56Al22.55Si14.36Y0.52 (wt.%), were prepared and investigated by combining nexperimental characterization with quantum-mechanical and CALPHAD calculations. The experimental results nindicated that Y can refine the Mg2Si phase in Mg-Al-Si alloys but it is rather sensitive to the preparation procedure of the alloys. It was observed that Al4MgY is surrounded by Mg2Si in the as-cast alloys with Y, but it undergoes separation after homogenization annealing. First-principles calculations revealed that the mechanism of Y refining the Mg2Si phase is direct adsorption on the Mg2Si surface rather than indirect adsorption in the form nof the elements atomic substitution or entering the center interstitial sites of Mg2Si. The significant refinement of nthe Mg2Si phase after annealing is attributed to recrystallization within the grains, eliminating the original grain nboundaries, and the surface activity is reduced with Y adsorption, resulting in the formation of new and smaller nMg2Si phases. The mechanism behind the Al4MgY phase being surrounded by Mg2Si in the as-cast state but nsubsequent separation after homogenization annealing is not heterogeneous nucleation, but maybe due to liquid nentrapment.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

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

Project

<a href="/en/project/GA22-22187S" target="_blank" >GA22-22187S: The theoretical and experimental study of the Al-Ge-Mg-Sn systems, application of novel 3rd generation data in CALPHAD-type thermodynamic modelling</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

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

Name of the periodical

Journal of Alloys and Compounds

ISSN

0925-8388

e-ISSN

1873-4669

Volume of the periodical

1002

Issue of the periodical within the volume

OCT

Country of publishing house

CH - SWITZERLAND

Number of pages

11

Pages from-to

175432

UT code for WoS article

001266919400001

EID of the result in the Scopus database

2-s2.0-85197486259