Low-temperature brazing of titanium by the application of a Zr–Ti–Ni–Cu–Bebulk metallic glass (BMG) alloy as a filler

Lee, Jung G.; Choi, Yong; Lee, J.K.; Lee, G.J.; Lee, M.K.; Rhee, Chang Kyu

doi:10.1016/j.intermet.2009.06.012

Cited by 35 publications

(21 citation statements)

References 15 publications

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“…Similar to the previous case (STEMET 1228); increasing the brazing time was the main factor for the elevated joint strength, causing fracture propagation in the base material instead of the brazed joint. Segregation of the alloying elements (Zr-Cu-Ni) in the braze center region deteriorates the mechanical bonding strength of the brazed joints [15,16,28]. It is well known that the shear strength is 0.577 [29] of maximum tensile strength.…”

Section: 3mentioning

confidence: 99%

Increasing Ti–6Al–4V brazed joint strength equal to the base metal by Ti and Zr amorphous filler alloys

Ganjeh

Sarkhosh

Bajgholi

et al. 2012

Materials Characterization

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Microstructural features developed along with mechanical properties in furnace brazingof 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 2 Cu, Ti 2 Cu and (Ti, Zr) 2 Ni 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.

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Section: 3mentioning

confidence: 99%

Increasing Ti–6Al–4V brazed joint strength equal to the base metal by Ti and Zr amorphous filler alloys

Ganjeh

Sarkhosh

Bajgholi

et al. 2012

Materials Characterization

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“…The advantages of titanium brazing in comparison with welding are: a decrease of energy and heat input, the decrease of residual stress, a lighter weight structure and the absence of a heat affected zone (HAZ). In titanium brazing technology, it is recommended that the brazing temperature does not exceed the a-b transformation temperature (usually 880-910°C) in order to preserve the original microstructural and mechanical property of the Ti base metal [1][2][3]8]. With decreasing time or temperature of brazing, erosion of the substrate and excessive growth of intermetallic phase at the interface will be significantly decreased or eliminated [9].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2012

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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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“…Especially, among those, a Zr-rich Zr 41.2 Ti 13.8 Ni 10.0 Cu 12.5 Be 22.5 (at.%) amorphous alloy with a quite low melting temperature of 665 C [11] could not only lower a brazing temperature down to 800 C, but also provide a high strength of the joints [12,13]. One might also expect that such a low temperature brazing would be very promising for a Ti-Cu dissimilar joining.…”

Section: Introductionmentioning

confidence: 99%

Intermetallic formation in a Ti–Cu dissimilar joint brazed using a Zr-based amorphous alloy filler

et al. 2010

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Low-temperature brazing of titanium by the application of a Zr–Ti–Ni–Cu–Bebulk metallic glass (BMG) alloy as a filler

Cited by 35 publications

References 15 publications

Increasing Ti–6Al–4V brazed joint strength equal to the base metal by Ti and Zr amorphous filler alloys

Increasing Ti–6Al–4V brazed joint strength equal to the base metal by Ti and Zr amorphous filler alloys

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

Intermetallic formation in a Ti–Cu dissimilar joint brazed using a Zr-based amorphous alloy filler

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