The role of foam on microstructure and strength of the brazed C/C composites/Ti6Al4V alloy joint

Guo, Wei; Xue, Jia; Zhang, Hongqiang; Cui, Haipo; Zhu, Ying; Peng, Peng; Qi, Bojin

doi:10.1016/j.vacuum.2020.109543

Cited by 28 publications

(5 citation statements)

References 45 publications

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“…When the brazing temperature rises to 880 °C, the dissolution of GH4169 superalloy increases, and the diffusion rate of the element increases greatly; thus, more Cu and Ni diffuse to the molten filler alloy, and the volume fraction of Ti 2 Ni and Ti-Cu compounds increases. The collapse of Cu foam also increases the residual stress [32,33] in the brazed joint, which reduces the mechanical properties. When the temperature reaches 910 • C, more Cu is dissolved into the brazing seam.…”

Section: Effect Of Brazing Temperature On the Gh4169/si3n4 Jointmentioning

confidence: 99%

“…The shear strength of the brazed joint increased from 151.4 MPa to 196.8 MPa. Thus, AgCuTi filler with Cu foam as the intermediate layer is beneficial to alleviate the residual stress, which is caused by the thermal mismatch between ceramic and metal in the brazing process [33,34]. Therefore, the shear strength of the GH4169/Si3N4 joint increased by about 29.9%.…”

Section: Effect Of Brazing Temperature On the Gh4169/si3n4 Jointmentioning

confidence: 99%

See 1 more Smart Citation

Microstructure and Mechanical Properties of GH4169 Superalloy and Si3N4 Ceramic Joints Brazed with AgCuTi/Cu foam/AgCuTi Composited Filler

et al. 2022

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GH4169 superalloy and Si3N4 ceramics were vacuum-brazed with AgCuTi+Cu foam composite filler. The effect of brazing temperature on the microstructure and mechanical properties of the GH4169/Si3N4 joint was studied. The results show that the interface microstructure of the GH4169/Si3N4 joint is the GH4169 superalloy/TiCu+Ti2Ni+TiCu2+Ag(s, s)+TiCu4+Cu(s, s)+TiN+Ti5Si3/Si3N4 ceramics. With the increase in brazing temperature, the element diffusion between the base metal and the brazing filler intensifies, and the interfacial reaction layer thickens, which is conducive to the improvement of shear strength. At 850 °C, the maximum shear strength of the joint is 196.85 MPa. After further increases in the brazing temperature, Cu foam dissolves completely, and the Ti-Cu intermetallic compounds increase, which is harmful to the shear strength due to the increases in the brittle phase. However, when the brazing temperature reaches 910 °C, the shear strength of the brazing joint slightly increases under the combined effect of the Ti-Cu intermetallic compounds and the thickness of the reaction layer.

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Section: Effect Of Brazing Temperature On the Gh4169/si3n4 Jointmentioning

confidence: 99%

Section: Effect Of Brazing Temperature On the Gh4169/si3n4 Jointmentioning

confidence: 99%

Microstructure and Mechanical Properties of GH4169 Superalloy and Si3N4 Ceramic Joints Brazed with AgCuTi/Cu foam/AgCuTi Composited Filler

et al. 2022

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“…In this particular application, as the nozzle design and size gradually increase to allow for enhancing aircraft performance, it becomes increasingly difficult from a manufacturing point of view to produce C/C composite-based complex structures in one manufacturing step. To address this issue, C/C composite nozzles are always bonded to a metallic component, such as TC4 (Ti6Al4V, wt-%) alloy [8][9][10]. This particular alloy shows highly suitable mechanical properties such as outstanding plasticity, high specific strength and suitable thermostability when manufactured through brazing methods [11,12].…”

Section: Introductionmentioning

confidence: 99%

In situ dispersed carbon fibre network for reinforcing a C/C composite–TC4 alloy brazed joint

Wang

Butt

et al. 2023

Science and Technology of Welding and Joining

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In this work, a robust brazed joint of carbon fibre-reinforced carbon-based (C/C) composite and TC4 alloy was produced by utilising a slice of C/C as an interlayer. The C/C slice interlayer caused microstructural and mechanical property enhancement. During brazing, massive in situ formed carbon fibres broke away from the C/C slice bundles and were distributed in a three-dimensional interlocked network. These unique fibres consumed excessive Ti to inhibit the formation of excess brittle Ti-Cu compounds in the brazing seam. This reduced the coefficient of thermal expansion effectively, consequently relieving the high residual stress in the joint interface. The average shear strength of the joint brazed with the C/C slice interlayer reached 1.65 times higher than the directly brazed one.

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“…[9] Introduction of interlayers may reduce the joint residual stress by accommodating the physical and chemical incompatibility between dissimilar materials. [10][11][12][13][14][15][16] Peng et al reported that W/CuCrZr joint stress relief was achieved by the use of Cu interlayer. [10] Li et al investigated the effect of interlayers on residual stress distribution in graphite/Cu joint by X-ray diffraction (XRD).…”

Section: Introductionmentioning

confidence: 99%

Effect of Nb or Ta Interlayer on Microstructure and Mechanical Properties of Graphite/Ti6Al4V Alloy Joints

Mao

Duan

et al. 2021

Adv Eng Mater

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Graphite/Ti6Al4V (TC4) joining has been conducted with Cu–Ti–Ni filler and refractory metal (Nb or Ta) interlayer. Microstructural characterizations reveal that defect‐free interfaces are obtained among the refractory metal interlayer, fillers, and substrates, suggesting favorable interfacial bonding in the joints. The diffusion and dissolution of Nb or Ta atoms into the molten fillers occur during joining, leading to the formation of (Ti, R) solid solution ([Ti, R]ss, R = Nb, or Ta) in the filler layers and thickness decrease in the interlayer. Two filler layers adjacent to the interlayer primarily consist of Ti–Cu, Ti–Cu–Ni intermetallics, and (Ti, R)ss. A Ti‐rich diffusion layer and a thin TiC‐containing layer exist near TC4 and graphite substrates, respectively. The joints brazed with Nb and Ta interlayers exhibit shear strength of 2 1.0 ± 2.7 MPa and 20.2 ± 3.1 MPa, respectively, both higher than those without interlayer, implying that the introduction of refractory metal interlayer may benefit the joint stress relaxation by its intermediate coefficient of thermal expansion and high ductility. The joint strength with Nb interlayer is slightly higher than that with Ta interlayer, mainly attributed to the relatively lower elastic modules and yield strength of Nb.

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The role of foam on microstructure and strength of the brazed C/C composites/Ti6Al4V alloy joint

Cited by 28 publications

References 45 publications

Microstructure and Mechanical Properties of GH4169 Superalloy and Si3N4 Ceramic Joints Brazed with AgCuTi/Cu foam/AgCuTi Composited Filler

Microstructure and Mechanical Properties of GH4169 Superalloy and Si3N4 Ceramic Joints Brazed with AgCuTi/Cu foam/AgCuTi Composited Filler

In situ dispersed carbon fibre network for reinforcing a C/C composite–TC4 alloy brazed joint

Effect of Nb or Ta Interlayer on Microstructure and Mechanical Properties of Graphite/Ti6Al4V Alloy Joints

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