Increasing Ti-6Al-4V brazed joint strength equal to the base metal by Ti and Zr amorphous filler alloys
Author
Ganjeh, E.
Sarkhosh H.
Bajgholi, M.E.
Khorsand H.
Ghaffari, M.
Date
2012Source Title
Materials Characterization
Print ISSN
10445803
Volume
71
Pages
31 - 40
Language
English
Type
ArticleItem Usage Stats
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Abstract
Microstructural features developed along with mechanical properties in furnace brazing of Ti-6Al-4V alloy using STEMET 1228 (Ti-26.8Zr-13Ni-13.9Cu, wt.%) and STEMET 1406 (Zr-9.7Ti-12.4Ni-11.2Cu, wt.%) amorphous filler alloys. Brazing temperatures employed were 900-950 °C for the titanium-based filler and 900-990 °C for the zirconium-based filler alloys, respectively. The brazing time durations were 600, 1200 and 1800 s. The brazed joints were evaluated by ultrasonic test, and their microstructures and phase constitutions analyzed by metallography, scanning electron microscopy and X-ray diffraction analysis. Since microstructural evolution across the furnace brazed joints primarily depends on their alloying elements such as Cu, Ni and Zr along the joint. Accordingly, existence of Zr 2Cu, Ti 2Cu and (Ti,Zr) 2Ni intermetallic compounds was identified in the brazed joints. The chemical composition of segregation region in the center of brazed joints was identical to virgin filler alloy content which greatly deteriorated the shear strength of the joints. Adequate brazing time (1800 s) and/or temperature (950 °C for Ti-based and 990 °C for Zr-based) resulted in an acicular Widmanstätten microstructure throughout the entire joint section due to eutectoid reaction. This microstructure increased the shear strength of the brazed joints up to the Ti-6Al-4V tensile strength level. Consequently, Ti-6Al-4V can be furnace brazed by Ti and Zr base foils produced excellent joint strengths. © 2012 Elsevier Inc. All rights reserved.
Keywords
Furnace brazingMechanical properties
Microstructure
Ti-6Al-4V alloy
XRD analysis
Base metals
Brazed joint
Brazing temperature
Brazing time
Chemical compositions
Eutectoid reaction
Filler alloy
Furnace brazing
Joint strength
Microstructural features
Phase constitution
Ti-6al-4v
Ti-6Al-4V alloy
Titanium-based
Ultrasonic test
XRD analysis
Alloying elements
Alloys
Aluminum
Amorphous alloys
Brazing
Cerium alloys
Fillers
Furnaces
Joints (structural components)
Mechanical properties
Microstructural evolution
Microstructure
Scanning electron microscopy
Titanium
Ultrasonic testing
X ray diffraction analysis
Zirconium
Titanium alloys
Permalink
http://hdl.handle.net/11693/21340Published Version (Please cite this version)
http://dx.doi.org/10.1016/j.matchar.2012.05.016Collections
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