Liquid Phase Separation and Dual Glassy Structure Formation of Designed Zr-Ce-Co-Cu Alloys
| Autor: | Jiuzhou Zhao, Bai Jun Yang, Tongmin Wang, Hong Xiang Jiang, Hong Ri Hao, Jie He, Zhong Yuan Wang |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Quenching
Work (thermodynamics) Structure formation Amorphous metal Chromatography Materials science Spinodal decomposition Mechanical Engineering Alloy engineering.material Condensed Matter Physics Chemical engineering Mechanics of Materials engineering General Materials Science Atomic ratio Eutectic system |
| Zdroj: | Materials Science Forum. 849:100-106 |
| ISSN: | 1662-9752 |
| DOI: | 10.4028/www.scientific.net/msf.849.100 |
| Popis: | Development of liquid-phase separated bulk metallic glasses is retarded due to difficulties in finding of immiscible systems with high glass-forming ability (GFA) of coexistent liquids. Zr-Ce alloy is a typical liquid immiscible system characterized by a liquid miscibility gap. We added Co and Cu into the Zr-Ce immiscible system and optimized the composition of the designed Zr-Ce-Co-Cu immiscible alloys. The solidification experiments were carried out for the quaternary alloys. The result indicates that the melt separated into ZrCo-rich and CeCu-rich liquids upon cooling through the miscibility gap. By optimizing the relative atomic ratio of Co:Cu, the coexistent ZrCo-rich and CeCu-rich liquids automatically assembled eutectic compositions during the liquid-liquid phase separation (LLPS). Under the condition of fast quenching, the two liquids subsequently undergo liquid-to-glass transition, resulting in the formation of composite structure with two glasses in the samples. We successfully developed phased-separated metallic glasses based on the Zr-Ce-Co-Cu immiscible alloys. This work not only strengthens the understanding in the LLPS but also provides a new strategy on the design of the dual glassy composites. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|