Microstructural Characterization of Melt Extracted High-Nb-Containing TiAl-Based Fiber

The microstructure of melt extracted Ti-44Al-8Nb-0.2W-0.2B-1.5Si fiber were investigated. When the rotation speed increased from 2000 to 2600 r/min, the appearance of the wire was uniform with no Rayleigh-wave default. The structure was mainly composed of fine α(2) (α) phase dendritic crystal and a...

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Detalles Bibliográficos
Autores principales: Zhang, Shuzhi, Zhang, Shuling, Chen, Yanfei, Han, Jianchao, Zhang, Changjiang, Wang, Xiaopeng, Chen, Yuyong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5459212/
https://www.ncbi.nlm.nih.gov/pubmed/28772555
http://dx.doi.org/10.3390/ma10020195
Descripción
Sumario:The microstructure of melt extracted Ti-44Al-8Nb-0.2W-0.2B-1.5Si fiber were investigated. When the rotation speed increased from 2000 to 2600 r/min, the appearance of the wire was uniform with no Rayleigh-wave default. The structure was mainly composed of fine α(2) (α) phase dendritic crystal and a second phase between dendrite arms and grain boundaries. The precipitated second phases were confirmed to be Ti(5)Si(3) from the eutectic reaction L→Ti(5)Si(3) + α and TiB. As the lower content of Si and higher cooling rate, a divorced eutectic microstructure was obtained. Segregation of Ti, Nb, B, Si, and Al occurred during rapid solidification.

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