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Joining of TiAl Alloy Using Novel Ag–Cu Sputtered Coated Ti Brazing Filler

Published online by Cambridge University Press:  06 November 2018

Sónia Simões Open the ORCID record for Sónia Simões [Opens in a new window] ,
Ana Soares ,
Carlos José Tavares  and
Aníbal Guedes
Sónia Simões*
Affiliation:
CEMMPRE, Department of Metallurgical and Materials Engineering, University of Porto, R. Dr. Roberto Frias, 4200-465 Porto, Portugal INEGI - Institute of Science and Innovation in Mechanical and Industrial Engineering, R. Dr. Roberto Frias, 4200-465 Porto, Portugal
Ana Soares
Affiliation:
CEMMPRE, Department of Metallurgical and Materials Engineering, University of Porto, R. Dr. Roberto Frias, 4200-465 Porto, Portugal
Carlos José Tavares
Affiliation:
Centre of Physics, Minho University, Azurém, 4800-058 Guimarães, Portugal
Aníbal Guedes
Affiliation:
Department of Mechanical Engineering, CMEMS-UMinho, Minho University, Azurém 4800-058 Guimarães, Portugal
*
Author for correspondence: Sónia Simões, E-mail: [email protected]
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Abstract

The aim of this study is to evaluate the potential use of titanium foil coated with sputtered silver and copper films as a novel brazing filler for joining TiAl alloys. For this purpose, a detailed microstructural characterization of the resulting brazing interfaces was carried out. The development of brazing fillers that allow the joining of TiAl alloys without compromising the service temperature is a fruitful prospect. Brazing experiments were performed in a vacuum at 900, 950, and 980°C, with a dwell time of 30 min. Microstructural characterization reveals that brazing joints can be obtained successfully at 950 and 980°C. The interface consists of a large central region of α-Ti with an amount of Al and Ti–Ag compound and thin layers, mainly composed of intermetallic compounds, formed close to the base material. A novel brazing filler consisting of Ti foil coated with sputtered Ag and Cu films inhibits the extensive formation of soft (Ag) zones or coarse brittle Ti–Al–(Cu,Ni) particles. Hence, the need for post-brazing heat treatments for the joining of TiAl alloys was avoided.

Keywords

brazingtial alloysmicrostructural characterizationelectron microscopyenergy-dispersive X-ray spectroscopy
Type
Material Sciences
Information
Microscopy and Microanalysis , Volume 25 , Issue 1 , February 2019 , pp. 192 - 195
Copyright
Copyright © Microscopy Society of America 2018 

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