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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

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

<a href="/cs/project/GA22-22187S" target="_blank" >GA22-22187S: Teoretické a experimentální studium soustavy Al-Ge-Mg-Sn s využitím nové 3. generace dat při termodynamickém modelování metodou CALPHAD</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Journal of Alloys and Compounds

ISSN

0925-8388

e-ISSN

1873-4669

Svazek periodika

1002

Číslo periodika v rámci svazku

OCT

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

11

Strana od-do

175432

Kód UT WoS článku

001266919400001

EID výsledku v databázi Scopus

2-s2.0-85197486259