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

Autor: Hamed Sabet, Mohammad Ali Ghaffari, Hadi Sarkhosh, E.H. Dehkordi, Hamid Khorsand, E. Ganjeh
Rok vydání: 2012
Předmět:
Braze joints
Intermetallic
Bonded joint
Mechanical properties
Filler alloy
Critical factors
Solid solution matrices
G. Scanning electron microscopy
Cadmium alloys
Rating
Composite material
Microstructure
Titanium
Atmosphere controls
Brazed joint
Ultrasonic test
Phase constitution
D. Brazing and soldering
Shear tests
Reaction layers
Zinc
Commercially Pure titaniums
Metallography
Direct shear test
Scanning electron microscopy
Quasi-cleavage
Silver
Materials science
Intermetallics
X ray diffraction
Alloy
chemistry.chemical_element
engineering.material
Brazing temperature
Indentation hardness
Intermetallic phasis
Silver alloys
Brazing
Holding time
Ultrasonic testing
Braze alloys
Optimum brazing parameters
F. Microstructure
Metallurgy
Brazing parameters
Quality control
Fillers
chemistry
engineering
Zdroj: Materials and Design
ISSN: 0261-3069
Popis: 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.
Databáze: OpenAIRE
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