Structural Evaluation of Mechanically Alloyed and Heat-Treated Ti-25at-%Si Powders

Autor(es)

de Souza, Marisa Aparecida ; Trindade Ramos, Erika Coaglia ; Ramos, Alfeu Saraiva ; Salgado, L ; Ambrozio, F

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

Resumo

This work discusses on the structural evaluation of mechanically alloyed and heat-treated Ti-25at%Si powders. The milling process was conducted in a planetary ball mill using stainless steel balls/vials, 200 rpm and ball-to-powder weight ratio of 5:1, whereas the heat treatment was conducted under Ar atmosphere at 1100 C for 4 h. Samples were characterized by X-ray diffraction, differential scanning calorimetry, scanning electron microscopy and energy dispersive spectrometry. The Si peaks disappeared after milling for 30h, indicating that the Si atoms were dissolved into the Ti lattice in order to form an extended solid solution. The Ti peaks were broadened and their intensities reduced for longer milling times whereas a halo was formed in Ti-25Si powders milled for 200h suggesting that an amorphous structure was achieved. The crystallite size was decreased with increasing milling times. A large Ti3Si amount was found in mechanically alloyed Ti-25at%Si powders after heating at 1100 degrees C for 4h. (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
• Processo FAPESP: 99/09327-3 - Avaliação experimental da seção isotérmica a 1750ºC e determinação da projeção liquidus na região rica em Ta do sistema Ta-B-Si
• Beneficiário: Erika Coaglia Trindade Ramos
• Modalidade de apoio: Bolsas no Brasil - Doutorado