Selection of compositions with high glass forming ability in the Ni-Nb-B alloy system

Materials Research

Marcio Andreato Batista Mendes¹  Luis César Rodríguez Aliaga²  Claudio Shyinti Kiminami²  Marcelo Falcão De Oliveira²  Walter José Botta Filho²  Claudemiro Bolfarini² 

[1] ,Universidade Federal de São Carlos Departamento de Engenharia de Materiais Programa de Pós-graduação em Ciência e Engenharia de MateriaisSão Carlos SP ,Brasil

关键词: metallic glass;    rapid solidification processing;    ternary alloy systems;   

DOI  :  10.1590/S1516-14392012005000090

来源: SciELO

【 摘 要 】

A combination of an extension of the topological instability "λ criterion" and the "average electronegativity" has been recently reported in the literature to predict compositions with high glass-forming ability (GFA). In the present work, both criteria have been applied to select the Ni61.0Nb36.0B3 alloy with a high glass-forming ability. Ingots were prepared by arc-melting and were used to produce ribbons processed by the melt-spinning technique further characterized by differential scanning calorimetry (DSC), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The Ni61.0Nb36.0B3 alloy revealed a complete amorphization and supercooled liquid region ΔTx = 68 K. In addition, wedge-shaped samples were prepared using copper mold casting in order to determine the critical thickness for amorphous formation. Scanning electron microscopy (SEM) revealed that fully amorphous samples could be obtained, reaching up to ~800 µm in thickness.

【 授权许可】

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