Evaluate of braze joint strength and microstructure characterize of titanium-CP with Ag-based filler alloy

Date
2012
Authors
Ganjeh, E.
Sarkhosh H.
Khorsand H.
Sabet H.
Dehkordi, E.H.
Ghaffari, M.
Advisor
Supervisor
Co-Advisor
Co-Supervisor
Instructor
Source Title
Materials and Design
Print ISSN
0264-1275
Electronic ISSN
Publisher
Volume
39
Issue
Pages
33 - 41
Language
English
Type
Article
Journal Title
Journal ISSN
Volume Title
Series
Abstract

This research investigates the influences of brazing parameters (temperature and time) on microstructures and the mechanical properties of commercially pure (CP) titanium sheet when it is brazed with CBS34 (Ag-20Cu-22Zn-24Cd) braze filler foil. Brazing was performed in a conventional atmosphere control furnace. The brazing temperatures and holding times employed in this study were 800-870°C and 10-20min, respectively. The qualities of the brazed joints were evaluated by ultrasonic test and the microstructure and phase constitution of the bonded joints were analyzed by means of metallography, scanning electron microscope (SEM) and X-ray diffraction (XRD). The mechanical properties of brazed joints were evaluated by microhardness and shear tests. The diffusion between Ti, Ag, Cu, Zn and Cd from substrate and braze alloy, developed a strong reaction between each other. A number of intermetallic phases, such as TiCu and Ti2Cu in the Ag-Zn solid solution matrix have been identified especially at 870°C - 20min. Both the brazing temperature and the holding time are critical factors for controlling the microstructure and hence the mechanical properties of the brazed joints. The optimum brazing parameters was achieved at 870°C - 20min. Based on the shear test result, all cracks propagate along the brittle intermetallic compounds like Ti2Cu in the reaction layer which typically are composed of quasi-cleavage (Ag-Zn matrix) and brittle appearance. © 2012 Elsevier Ltd.

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Keywords
D. Brazing and soldering, F. Microstructure, G. Scanning electron microscopy, Atmosphere controls, Bonded joint, Braze alloys, Braze joints, Brazed joint, Brazing parameters, Brazing temperature, Commercially Pure titaniums, Critical factors, F. Microstructure, Filler alloy, G. Scanning electron microscopy, Holding time, Intermetallic phasis, Optimum brazing parameters, Phase constitution, Quasi-cleavage, Reaction layers, Shear tests, Solid solution matrices, Ultrasonic test, Cadmium alloys, Fillers, Intermetallics, Mechanical properties, Microstructure, Quality control, Rating, Scanning electron microscopy, Silver, Silver alloys, Titanium, Ultrasonic testing, X ray diffraction, Zinc, Brazing
Citation
Published Version (Please cite this version)