Microstructural Characterization of Diffusion Bonds Assisted by Ni/Ti Nanolayers

• Type: Article in International Scientific Journal
• Date: 2016

Authors

Simoes, S (Author) FEUP; Filomena Viana (Author) FEUP; Sofia Ramos, A (Author) Other; Teresa Vieira, M (Author) Other; Vieira, MF (Author) FEUP

Journal

Title: Journal of Materials Engineering and Performance

Vol. 25 No. 8

Pages: 3245-3251

ISSN: 1059-9495

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 7 Citations

Scopus - 6 Citations

Scientific classification

CORDIS: Technological sciences > Engineering > Materials engineering

FOS: Engineering and technology > Materials engineering

Other information

Authenticus ID: P-00K-G8J

DOI: 10.1007/s11665-016-2135-z

Abstract (EN): The microstructure of similar and dissimilar diffusion bonds of metallic materials using reactive Ni/Ti interlayers was studied in this investigation. The base material surfaces were modified by sputter deposition of alternated Ni and Ti nanolayers. These nanolayers increase the diffusivity at the interface, enhancing the bonding process. Bonding experiments were performed at 800 A degrees C under a pressure of 10 MPa with a bonding time of 60 min. The reaction zone was characterized by high-resolution scanning and transmission electron microscopies. Microstructural characterization reveals that similar (NiTi to NiTi and TiAl to TiAl) and dissimilar (NiTi to Ti6Al4V and TiAl to stainless steel) joints can be obtained successfully with Ni/Ti reactive nanolayers. The interfaces are thin (< 10 A mu m) and their microstructure (thickness and number of zones, size and shape of the grains) depends on the elements diffusing from the base materials. For all joints, the interface is mainly composed of equiaxed grains of NiTi and NiTi2.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7