Formation of Ni₃Ta, Ni₂Ta and NiTa by High-Energy Ball Milling and Subsequent Heat Treatment

Abstract:

The present work reports on the formation of Ni₃Ta, Ni₂Ta and NiTa by high-energy ball milling and subsequent heat treatment. The elemental Ni-25Ta, Ni-33Ta and Ni-50Ta (at.-%) powder mixtures were ball milled under Ar atmosphere using stainless steel balls and vials as well as 300 rpm and a ball-to-powder weight ratio of 10:1. Following, the as-milled samples were uniaxially compacted and heat-treated under Ar atmosphere at 1100°C for 4h. The characterization of as-milled and heat-treated samples was conducted by means of X-ray diffraction, scanning electron microscopy, and energy dispersive spectrometry techniques. Supersaturated solid solutions were formed during ball milling of the Ni-25Ta, Ni-33Ta and Ni-50Ta powders. A large amount of Ni₃Ta, Ni₂Ta and NiTa was formed in the mechanically alloyed heat-treated Ni-25Ta, Ni-33Ta and Ni-50Ta alloys, respectively.

• Periodical: Materials Science Forum (Volume 869)
• Pages: 423-428
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.869.423
• Online since: August 2016
• Authors: Hanna Stefanni Nunes Benites, Bruna Pereira da Silva, Antonio Augusto Araújo Pinto da Silva, Belmira Benedita de Lima, Gilberto Carvalho Coelho, Alfeu Saraiva Ramos
• Keywords: Intermetallics, Mechanical Alloying, Nickel Alloys, Phase Transformation

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