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Materials 2017, 10(2), 195; doi:10.3390/ma10020195

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

1
School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2
Shanxi Key Laboratory of Advanced Magnesium-based Materials, Taiyuan University of Technology, Taiyuan 030024, China
3
School of Mechanical Engineering, Ningxia University, Ningxia 750021, China
4
Ningbo Branch of China Ordnance Academy, Ningbo 315000, China
5
School of Mechanical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
6
National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China
*
Author to whom correspondence should be addressed.
Academic Editor: Javier Narciso
Received: 24 December 2016 / Revised: 25 January 2017 / Accepted: 14 February 2017 / Published: 17 February 2017
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Abstract

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 α2 (α) phase dendritic crystal and a second phase between dendrite arms and grain boundaries. The precipitated second phases were confirmed to be Ti5Si3 from the eutectic reaction L→Ti5Si3 + 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. View Full-Text
Keywords: intermetallics; rapid-solidification; melt extracted; Ti5Si3; divorced eutectic; TEM intermetallics; rapid-solidification; melt extracted; Ti5Si3; divorced eutectic; TEM
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Zhang, S.; Zhang, S.; Chen, Y.; Han, J.; Zhang, C.; Wang, X.; Chen, Y. Microstructural Characterization of Melt Extracted High-Nb-Containing TiAl-Based Fiber. Materials 2017, 10, 195.

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