Microstructure of Reaction Zone Formed During Diffusion Bonding of TiAl with Ni/Al Multilayer

• Tipo: Artigo em Revista Científica Internacional
• Data: 2012

Autores

Sónia Simões (Autor) FEUP; Filomena Viana (Autor) FEUP; Mustafa Koçak (Autor) Outra; A. Sofia Ramos (Autor) Outra; M. Teresa Vieira (Autor) Outra; Manuel F. Vieira (Autor) FEUP

Revista

Título: Journal of Materials Engineering and Performance

Vol. 21 Nº 11

Páginas: 678-682

ISSN: 1059-9495

Editora: Springer Nature

Indexação

ISI Web of Knowledge - 26 Citações

Scopus - 31 Citações

INSPEC

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia dos materiais

CORDIS: Ciências Tecnológicas > Engenharia

Outras Informações

ID Authenticus: P-002-AM6

DOI: 10.1007/s11665-012-0144-0

Abstract (EN): In this article, the characterization of the interfacial structure of diffusion bonding a TiAl alloy is presented. The joining surfaces were modified by Ni/Al reactive multilayer deposition as an alternative approach to conventional diffusion bonding. TiAl substrates were coated with alternated Ni and Al nanolayers. The nanolayers were deposited by dc magnetron sputtering with 14 nm of period (bilayer thickness). Joining experiments were performed at 900 A degrees C for 30 and 60 min with a pressure of 5 MPa. Cross sections of the joints were prepared for characterization of their interfaces by scanning electron microscopy (SEM), transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM), high resolution TEM (HRTEM), energy dispersive x-ray spectroscopy (EDS), and electron backscatter diffraction (EBSD). Several intermetallic compounds form at the interface, assuring the bonding of the TiAl. The interface can be divided into three distinct zones: zone 1 exhibits elongated nanograins, very small equiaxed grains are observed in zone 2, while zone 3 has larger equiaxed grains. EBSD analysis reveals that zone 1 corresponds to the intermetallic Al2NiTi and AlNiTi, and zones 2 and 3 to NiAl.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 5