Evaluate of braze joint strength and microstructure characterize of titanium-CP with Ag-based filler alloy
Author
Ganjeh, E.
Sarkhosh H.
Khorsand H.
Sabet H.
Dehkordi, E.H.
Ghaffari, M.
Date
2012Source Title
Materials and Design
Print ISSN
0264-1275
Volume
39
Pages
33 - 41
Language
English
Type
ArticleItem Usage Stats
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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.
Keywords
D. Brazing and solderingF. 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
Permalink
http://hdl.handle.net/11693/21378Published Version (Please cite this version)
http://dx.doi.org/10.1016/j.matdes.2012.01.045Collections
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