Comparative study of the effect of W and Nb addition on microstructure and properties of Zr‒Cu-based thin-film metallic glasses

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Comparative study of the effect of W and Nb addition on microstructure and properties of Zr‒Cu-based thin-film metallic glasses

Popis výsledku v původním jazyce

This study explores the effect of gradual addition of W (negative mixing enthalpy with Zr but positive with Cu) and Nb (positive mixing enthalpy with both Zr and Cu) on microstructure and properties of Zr‒Cu-based TFMGs. Two film series, W‒Zr‒Cu and Nb‒Zr‒Cu, were prepared, keeping Zr:Cu as 1:1 and gradually varying the W and Nb content in the respective series. Each deposition was done in Ar using three magnetrons equipped with Zr and W/Nb targets operated in the dc regime and a Cu target in the HiPIMS regime.A systematic investigation revealed that W and Nb additions have a significant impact on microstructure and other properties of the films. The films remain amorphous with smooth surfaces (roughness &lt; 2 nm) up to 65 at.% of W or Nb, displaying vein-like features typical of metallic glasses upon fracture. W‒Zr‒Cu films with 67 at.% W are characterized by a combination of featureless structures (amorphous-like) close to the substrate and thin columns in the upper part of the film. Films with even higher W contents grow in a V-shaped columnar microstructure corresponding to the bcc α-W crystalline structure. Nb‒Zr‒Cu films with 70 at.% Nb clearly exhibit a dual-phase structure with thin columns surrounded by vein-like features. Further increase in the Nb content above 70 at.% leads to the formation of a crystalline structure with parallel columns and very small voids. These voids tend to vanish with increasing Nb content. A gradual increase in hardness and reduced Young’s modulus is observed with increasing W content for the amorphous W‒Zr‒Cu films and the crystalline films show an enhancement in hardness of up to 15% compared to films with pure W due to solid solution hardening. In the case of Nb‒Zr‒Cu films with up to 70 at.% Nb, the hardness remains nearly constant. However, further addition of Nb results in a decreased hardness and this reduction might be attributed to a less dense structure of the films.

Název v anglickém jazyce

Comparative study of the effect of W and Nb addition on microstructure and properties of Zr‒Cu-based thin-film metallic glasses

Popis výsledku anglicky

This study explores the effect of gradual addition of W (negative mixing enthalpy with Zr but positive with Cu) and Nb (positive mixing enthalpy with both Zr and Cu) on microstructure and properties of Zr‒Cu-based TFMGs. Two film series, W‒Zr‒Cu and Nb‒Zr‒Cu, were prepared, keeping Zr:Cu as 1:1 and gradually varying the W and Nb content in the respective series. Each deposition was done in Ar using three magnetrons equipped with Zr and W/Nb targets operated in the dc regime and a Cu target in the HiPIMS regime.A systematic investigation revealed that W and Nb additions have a significant impact on microstructure and other properties of the films. The films remain amorphous with smooth surfaces (roughness &lt; 2 nm) up to 65 at.% of W or Nb, displaying vein-like features typical of metallic glasses upon fracture. W‒Zr‒Cu films with 67 at.% W are characterized by a combination of featureless structures (amorphous-like) close to the substrate and thin columns in the upper part of the film. Films with even higher W contents grow in a V-shaped columnar microstructure corresponding to the bcc α-W crystalline structure. Nb‒Zr‒Cu films with 70 at.% Nb clearly exhibit a dual-phase structure with thin columns surrounded by vein-like features. Further increase in the Nb content above 70 at.% leads to the formation of a crystalline structure with parallel columns and very small voids. These voids tend to vanish with increasing Nb content. A gradual increase in hardness and reduced Young’s modulus is observed with increasing W content for the amorphous W‒Zr‒Cu films and the crystalline films show an enhancement in hardness of up to 15% compared to films with pure W due to solid solution hardening. In the case of Nb‒Zr‒Cu films with up to 70 at.% Nb, the hardness remains nearly constant. However, further addition of Nb results in a decreased hardness and this reduction might be attributed to a less dense structure of the films.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20506 - Coating and films

Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2025

Kód důvěrnosti údajů

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