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Title: Microstructural Characterization of Dissimilar Titanium Alloys Joints Using Ni/Al Nanolayers
Authors: Simões, Sónia
Viana, Filomena 
Ramos, Ana S. 
Vieira, M. Teresa 
Vieira, Manuel
Keywords: diffusion bonding; multilayers; titanium alloys; microstructure; interface; sputtering
Issue Date: 2018
Publisher: MDPI
Project: Project-POCI-01-0145-FEDER-031579- funded by FEDER funds through COMPETE2020—Programa Operacional Competitividade e Internacionalização (POCI) and by national funds (PIDDAC) through FCT/MCTES 
Serial title, monograph or event: Metals
Volume: 8
Issue: 9
Abstract: This study demonstrates the potential of the use of Ni/Al nanolayers for joining dissimilar titanium alloys. For this purpose, a detailed microstructural characterization of the diffusion bonding interfaces of TiAl to Ti6Al4V, TiAl to TiNi and TiNi to Ti6Al4V was carried out. The nanolayers (alternated aluminum and nickel (Ni-7V wt.%) layers) were deposited onto the base material surfaces. Diffusion bonding was performed at 700 and 800 C under pressures ranging from 5 to 40 MPa and at dwell times between 60 and 180 min. Microstructural characterization was performed using high resolution transmission and scanning electron microscopies. The results revealed that dissimilar titanium joints (TiAl to Ti6Al4V, TiAl to TiNi and TiNi to Ti6Al4V) assisted by Ni/Al nanolayers can be obtained successfully at 800 C for 60 min using a pressure of 20 MPa. The bond interfaces are thin (less than 10 m) and mainly composed of NiAl grains with a few nanometric grains of Al8V5. Thin layers of Al-Ni-Ti intermetallic compounds were formed adjacent to the base materials due to their reaction with the nanolayers.
ISSN: 2075-4701
DOI: 10.3390/met8090715
Rights: openAccess
Appears in Collections:I&D CEMMPRE - Artigos em Revistas Internacionais

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