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Metals 2016, 6(5), 96; doi:10.3390/met6050096

Joining of TiAl to Steel by Diffusion Bonding with Ni/Ti Reactive Multilayers

1
CEMUC, Department of Metallurgical and Materials Engineering, University of Porto, R. Dr. Roberto Frias, Porto 4200-465, Portugal
2
CEMUC, Department of Mechanical Engineering, University of Coimbra, R. Luís Reis Santos, Coimbra 3030-788, Portugal
*
Author to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 2 March 2016 / Revised: 14 April 2016 / Accepted: 20 April 2016 / Published: 25 April 2016
(This article belongs to the Special Issue Intermetallics 2016)
View Full-Text   |   Download PDF [7130 KB, uploaded 25 April 2016]   |  

Abstract

Dissimilar diffusion bonds of TiAl alloy to AISI 310 stainless steel using Ni/Ti reactive multilayers were studied in this investigation. The Ni and Ti alternating layers were deposited by d.c. magnetron sputtering onto the base materials, with a bilayer thickness of 30 and 60 nm. Joining experiments were performed at 700 and 800 °C for 60 min under pressures of 50 and 10 MPa. The effectiveness of using Ni/Ti multilayers to improve the bonding process was assessed by microstructural characterization of the interface and by mechanical tests. Diffusion bonded joints were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), electron backscatter diffraction (EBSD), transmission electron microscopy (TEM) and selected area electron diffraction (SAED), high resolution TEM (HRTEM) and Fast Fourier transform (FFT). The bonding interfaces are thin (approximately 5 µm thick) with a layered microstructure. For all joints, the interface is mainly composed of equiaxed grains of NiTi and NiTi2. The thickness and number of layers depends on the joining conditions and bilayer thickness of the multilayers. Mechanical characterization of the joints was performed by nanoindentation and shear tests. Young´s modulus distribution maps highlight the phase differences across the joint´s interface. The highest shear strength value is obtained for the joint produced at 800 °C for 60 min under a pressure of 10 MPa using Ni/Ti multilayers with 30 nm of bilayer thickness. View Full-Text
Keywords: diffusion bonding; TiAl; stainless steel; multilayers diffusion bonding; TiAl; stainless steel; multilayers
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Simões, S.; Ramos, A.S.; Viana, F.; Vieira, M.T.; Vieira, M.F. Joining of TiAl to Steel by Diffusion Bonding with Ni/Ti Reactive Multilayers. Metals 2016, 6, 96.

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