Three-dimensional graphene-reinforced Cu foam interlayer for brazing C/C composites and Nb

Carbon fiber reinforced AA5052 bulk composites were successfully fabricated by multi-pass friction stir processing (FSP), aiming to improve the wear-resistance of AA5052. The microstructural, mechanical and tribological performances of the composites were documented and investigated. Microstructure observations indicated that, in the composites, carbon fibers were homogeneously dispersed in large volume, where no obvious Al4C3 layer was detected between the matrix and the carbon fibers. The orientation of carbon fibers in the composites were random owing to the severe plastic deformation brought on by FSP. Further mechanical tests showed that the hardness of the composites increased by 46.8% comparing to the base metal, and that the composite fabricated at 1000 rpm and 75 mm/min showed 18.6% higher UTS and 13.0% higher elongation in comparison with the base metal. The wear tests illustrated that wear process of the composites was more stable and the wear volume loss was reduced by more than 70%. The strengthening of mechanical properties was attributed to formation of GNDs, crack deflection and load transfer of carbon fibers. The further analysis on the worn surfaces revealed that abrasive wear occurred in the composites, while adhesive wear occurred in both the based metal and FSPed matrix. The addition of carbon fibers segments in the aluminum could suppress the nucleation and propagation of micro-cracks, which effectively prevented the material peeling during the wear process and thus improved the tribological properties. In addition, the formation of mechanical mixing layer would be another contributing factor to the improvement of wear resistance.

Fabrication of in situ carbon fiber/aluminum composites via friction stir processing: Evaluation of microstructural, mechanical and tribological behaviors

Interfacial microstructure and mechanical properties of ZrB2SiCC ceramic and GH99 superalloy joints brazed with a Ti-modified FeCoNiCrCu high-entropy alloy

Ultra-high temperature ceramics: Aspiration to overcome challenges in thermal protection systems

Reliable brazing of Al2O3 ceramic and Ti6Al4V alloy was successfully achieved by using inactive Ag–Cu eutectic alloy and Ag–Cu + B composite filler. The effects of brazing temperature and B content on the interfacial microstructure and mechanical properties of the brazed joints were analyzed. The dissolution of active Ti element from Ti6Al4V alloy, which could be controlled by changing the brazing parameter, was the key factor to achieve a sound joint. TiB whiskers and Ti2Cu3 fine-particles were formed in the joint when the inactive Ag–Cu + B composite filler was used. The joint microstructure became fine and the thickness of Ti–Cu compound layer was reduced because of B additive. The maximum shear strength of 111 MPa was obtained for the joint brazed with Ag–Cu + 0.5 wt.% B composite filler. The fracture modes were changed from a bowed crack path to a step-like one due to B additive.

Microstructure and mechanical properties of Al2O3 ceramic and Ti6Al4V alloy joint brazed with inactive Ag–Cu and Ag–Cu + B

Molecular dynamics simulation of linear friction welding between dissimilar Ti-based alloys

An in situ short fiber reinforced brazing technique by taking advantage of reaction between ZrB2 and Ti has been developed for joining ZrB2–SiC ceramic and Ti6Al4V alloy. The Ag–Cu eutectic alloy was used as brazing interlayer to realize controllable growth of TiB in Ti-rich environment. The microstructural evolution of the joint was divided into four stages as experiments performed from 840°C to 920°C. The diffusion behaviors of Ti and B may play an important role on the preferential growth of TiB whiskers during brazing. The statistics of the length of TiB showed that a rapid growth appeared at 880°C. The accommodation to the coefficients of thermal expansion by TiB whiskers was evaluated and the shear strength of the joints was tested.

Microstructural Evolution and Growth Behavior of In Situ TiB Whisker Array in ZrB2–SiC/Ti6Al4V Brazing Joints

Electroplating assisted diffusion bonding of ZrC–SiC composite for full ceramic joints

The ZrB 2 –SiC ceramics were diffusion bonded to Nb using different thicknesses of Ni foam interlayer. The bonding experiments were performed at 750 °C, with a pressure of 20 MPa and for a bonding time of 60 min. A solid state intergranular penetration of Ni was found in ZrB 2 –SiC bonding region. The microstructures and chemical compositions of the joint interfaces were investigated by scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. It was found that the Ni foam compression involving extensive ligaments merging and discontinuous interfacial bonding was beneficial for stiffness improvement and stress release. The asynchronous cracking along bonding interface resulted in a ductile failure mode. The maximum shear strength of the joints was 155.6 MPa when using 4 mm thickness Ni foam as interlayer.

Diffusion bonding of ZrB2–SiC and Nb using dynamic compressed Ni foam interlayer

Microstructure evolution and its effect on the mechanical properties of the ZrC–SiC composite joint diffusion bonded with pure Ni foil

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