Effect of Molybdenum on the Formation of Ti₆Si₂B in Mechanically Alloyed Ti-Mo-Si-B Powders

Abstract:

This paper discusses on effect of molybdenum on the Ti₆Si₂B formation in mechanically alloyed and hot-pressed Ti-xMo-22Si-11B (x= 2, 5, 7 and 10 at%) alloys. High-energy ball milling and hot pressing were utilized to produce homogeneous and dense materials, which were characterized by scanning electron microscopy, X-ray diffraction, electron dispersive spectrometry, and Vickers hardness. The excessive agglomeration during milling was more pronounced in Mo-richer powders, which was minimized with the formation of brittle phases. Hot pressing of mechanically alloyed Ti-xMo-22Si-11B powders produced dense samples containing lower pore amounts than 1%. Ti₆Si₂B was formed in microstructure of the hot-pressed Ti-2Mo-22Si-11B alloy only. In Mo-richer quaternary alloys, the Ti₃Si and Ti₅Si₃ phases were preferentially formed during hot pressing. Oppositely to the ternary phase, the Ti₃Si phase dissolved a significant Mo amount. Vickers hardness values were reduced in hot-pressed Ti-xMo-22Si-11B alloys containing larger Mo amounts, which were dissolved preferentially in Ti solid solution.

• Periodical: Materials Science Forum (Volumes 727-728)
• Pages: 216-221
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.727-728.216
• Online since: August 2012
• Authors: Perseu Amaral Nunes, Alfeu Saraiva Ramos, Erika Coaglia Trindade Ramos
• Keywords: High-Energy Ball Milling, Hot Pressing, Titanium Alloy

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