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

Autor(es)

Nunes, Perseu Amaral ; Ramos, Alfeu Saraiva ; Trindade Ramos, Erika Coaglia ; Salgado, L ; Ambrozio, F

• Tipo de documento: Artigo Científico
• Fonte: Materials Science Forum; v. 727-728, p. 3-pg., 2012-01-01.

Resumo

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. (AU)

• Processo FAPESP: 01/07025-1 - Estudo sobre a produção de pós via moagem de alta energia de ligas do sistema Ti-Si-B
• Beneficiário: Alfeu Saraiva Ramos
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores