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On the Phase Transformation in Mechanically Alloyed Ni-Nb and Ni-Ta and Ni-Nb-Ta Powders

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Autor(es):
Ferraretto, Ana Clara ; Trindade Ramos, Erika Coaglia ; Ramos, Alfeu Saraiva ; Salgado, L ; Ambrozio, F
Número total de Autores: 5
Tipo de documento: Artigo Científico
Fonte: Materials Science Forum; v. 727-728, p. 2-pg., 2012-01-01.
Resumo

This paper reports on the phase transformation during the preparation of Ni-25Nb, Ni-25Ta, Ni-20Nb-5Ta and Ni-15Nb-10Ta (at-%) powders by high-energy ball milling from elemental powders. The milling process was performed in a planetary ball milling using stainless steel balls and vials, rotary speed of 300rpm, and a ball-to-powder of 10:1. To minimize contamination and spontaneous ignition the powders were handled under argon atmosphere in a glove box. The milled powders were characterized by means of X-ray diffraction techniques. Results indicated that the Ni atoms were preferentially dissolved into the Nb (and/or Ta) lattice at the initial milling times, which contributed to change the relative intensity on the diffraction peaks. After the dissolution of Nb (and/or Ta) into the Ni lattice, the Ni peaks were moved to the direction of lower diffraction angles in Ni-25Nb, Ni-25Ta, Ni-20Nb-5Ta, Ni-15Nb-10Ta powders, indicating that the mechanical alloying was achieved. (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