Physicochemical Analysis of Ti-Si-B Powder Alloys

Abstract:

Titanium alloys of Ti-Si-B system were manufactured by blended elemental powder method using Ti, Si and B powders as starting materials. It was found that uniaxial and isostatic pressing followed by hot pressing at around 1000°C, for 20 minutes, provided good densification of such alloys. The physicochemical studies were performed by means of scanning electron microscopy, X-ray diffraction, atomic force microscopy and microindentation/wear tests. The investigations revealed a multiphase microstructure formed mainly by α-titanium, Ti₆Si₂B, Ti₅Si₃, TiB and Ti₃Si phases. The phase transformations after pressureless sintering at 1200°C was also studied by X-ray diffraction for the Ti-18Si-6B composition. As stated in some other researches, these intermetallics in the α-titanium matrix provide high wear resistance and hardness, with the best wear rate of 0.2 mm³/N.m and the highest hardness of around 1300 HV.

• Periodical: Materials Science Forum (Volumes 727-728)
• Pages: 287-292
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.727-728.287
• Online since: August 2012
• Authors: Guilherme de Oliveira, Samantha de Fátima Magalhães Mariano, Bruno Bacci Fernandes, Mario Ueda, Alfeu Saraiva Ramos
• Keywords: High-Energy Ball Milling, Sintering, Titanium Alloy

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