Homogenization of a Metallic Melt: Enhancing the Thermal Stability of Glassy Metal

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F44555601%3A13520%2F23%3A43897521" target="_blank" >RIV/44555601:13520/23:43897521 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S2542529323000408?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2542529323000408?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.mtphys.2023.101004" target="_blank" >10.1016/j.mtphys.2023.101004</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Homogenization of a Metallic Melt: Enhancing the Thermal Stability of Glassy Metal

Popis výsledku v původním jazyce

Molding and thermoplastic processing of metallic glasses rely on using a homogenized state of the melt or supercooled liquid (structure inherited from the melt). To homogenize metallic melts, however, reaching the liquidus temperature is not sufficient, and the upper temperature for quenching is often chosen empirically. Here, it is proved experimentally via fast scanning calorimetry that the homogenization temperature of a prototyped Au-based metallic melt lies 192 K above its liquidus temperature of 663 K. The homogenized metallic melt has enhanced resistance to phase transformations, better thermal stability and improved glass-forming ability. The existence of a high-temperature miscibility gap, below which the melt spinodally decomposes, is the origin of a homogeneous-to-inhomogeneous crossover upon cooling the melt. When the initial quenching temperature is above a critical temperature delineating the existence of the miscibility gap and a high cooling rate is applied, the homogeneous melt structure is preserved in the metallic glass. Consequently, the glass shows suppressed crystallization on reheating. The enhanced thermal stability of the supercooled liquid promises practical engineering applications such as in thermoplastic forming, additive manufacturing or welding. The present study not only evidences the existence of a high-temperature miscibility gap in the multicomponent glass-forming alloy but also offers an alternative route to improve the thermal properties of metallic glasses for engineering applications.

Název v anglickém jazyce

Homogenization of a Metallic Melt: Enhancing the Thermal Stability of Glassy Metal

Popis výsledku anglicky

Molding and thermoplastic processing of metallic glasses rely on using a homogenized state of the melt or supercooled liquid (structure inherited from the melt). To homogenize metallic melts, however, reaching the liquidus temperature is not sufficient, and the upper temperature for quenching is often chosen empirically. Here, it is proved experimentally via fast scanning calorimetry that the homogenization temperature of a prototyped Au-based metallic melt lies 192 K above its liquidus temperature of 663 K. The homogenized metallic melt has enhanced resistance to phase transformations, better thermal stability and improved glass-forming ability. The existence of a high-temperature miscibility gap, below which the melt spinodally decomposes, is the origin of a homogeneous-to-inhomogeneous crossover upon cooling the melt. When the initial quenching temperature is above a critical temperature delineating the existence of the miscibility gap and a high cooling rate is applied, the homogeneous melt structure is preserved in the metallic glass. Consequently, the glass shows suppressed crystallization on reheating. The enhanced thermal stability of the supercooled liquid promises practical engineering applications such as in thermoplastic forming, additive manufacturing or welding. The present study not only evidences the existence of a high-temperature miscibility gap in the multicomponent glass-forming alloy but also offers an alternative route to improve the thermal properties of metallic glasses for engineering applications.

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/LM2018124" target="_blank" >LM2018124: Nanomateriály a nanotechnologie pro ochranu životního prostředí a udržitelnou budoucnost</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Materials Today Physics

ISSN

2542-5293

e-ISSN

2542-5293

Svazek periodika

31

Číslo periodika v rámci svazku

Neuveden

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

8

Strana od-do

"nestrankovano"

Kód UT WoS článku

000935404400001

EID výsledku v databázi Scopus

2-s2.0-85149058911