Structural Evolution of Ti-Fe-Si-B Alloys Produced by High-Energy Ball Milling and Sintering

Abstract:

This proposal aims at structural characterization of Ti-Fe-Si-B alloys produced by high-energy ball milling and subsequent sintering. In this study, quaternary alloys were prepared from raw materials of high purity: Ti (99.9 wt-%), Fe (99.8 wt-%), Si (99.999 wt-%) and B (99.5 wt-%). The milling process of the Ti-2Fe-22Si-11B and Ti-7Fe-22Si-11B (at-%) powders was carried out in a planetary Fritsch P-5 ball mill. Subsequently, the Ti-Fe-Si-B powders milled for 600 min were sintered (1100 ° C for 240 min) under vacuum to obtain equilibrium structures. The characterization of as-milled powders and sintered alloys was performed by means of X-ray diffraction, scanning electron microscopy, and electron dispersive spectrometry. Extended solid solutions were formed during the initial milling times while that the brittle Ti₅Si₃ phase was formed for longer milling times in both the quaternary powder mixtures. This fact contributed for reducing the particle sizes. Homogeneous samples containing a small amount of pore were obtained after sintering at 1100°C for 4h. Results have indicated that the iron addition favored the formation of different binary phases of the Ti-Si system, and the formation of the Ti₆Si₂B compound was inhibited from the Ti-Fe-Si-B powder mixtures.

• Periodical: Materials Science Forum (Volume 802)
• Pages: 3-8
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.802.3
• Online since: December 2014
• Authors: Wladimir Leite Pereira, Isadora Rossi Bertoli, Juliana de Aquino Franzé, Alfeu Saraiva Ramos, Neide Aparecida Mariano, Carlos Angelo Nunes, Erika Coaglia Trindade Ramos, Carlos Angelo Nunes
• Keywords: High Energy Milling, Titanium Alloy

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