Analysis of the Microstructure and Mechanical Properties of TiBw/Ti-6Al-4V Ti Matrix Composite Joint Fabricated Using TiCuNiZr Amorphous Brazing Filler Metal

Abstract

TiB crystal whiskers (TiBw) can be synthesized in situ in Ti alloy matrix through powder metallurgy for the preparation of a new type of ceramic fiber-reinforced Ti matrix composite (TMC) TiBw/Ti-6Al-4V. In the TiBw/Ti-6Al-4V TMC, the reinforced phase/matrix interface is clean and has superior comprehensive mechanical properties, but its machinability is degraded. Hence, the bonding of reliable materials is important. To further optimize the TiBw/Ti-6Al-4V brazing technology and determine the relationship between the microstructure and tensile property of the brazed joint, results demonstrate that the elements of brazing filler metal are under sufficient and uniform diffusion, the microstructure is the typical Widmanstätten structure, and fine granular compounds in β phase are observed. The average tensile strength of the brazing specimen is 998 MPa under room temperature, which is 97.3% of that of the base metal. During the high-temperature (400 °C) tensile process, a fracture occurred at the base metal of the highest tensile test specimen with strength reaching 689 MPa., and the tensile fracture involved a combination of intergranular and transgranular modes at both room temperature and 400 °C. The fracture surface has dimples, secondary cracks are generated by the fracture of TiB whiskers, and large holes form when whole TiB whiskers are removed. The proposed algorithm provides evidence for promoting the application of TiBw/Ti-6Al-4V TMCs in practical production.

Dissimilar Brazing of Ti–15Mo–5Zr–3Al and Commercially Pure Titanium Using Ti–Cu–Ni Foil

“…However, the distortion induced by welding and the geometry limitations of the components may restrict the use of fusionwelding processes [11]. Brazing is the alternative for joining different components of Materials 2021, 14, 5949 2 of 10 titanium and its alloys [14,15]. For the brazing of titanium alloys, Ti-, Ag-and Al-based fillers have been developed for industrial applications [16][17][18][19].…”

The Microstructure of Fe-Based Laminated Metal Composite Produced by Powder Metallurgy

“…This strength–ductility tradeoff is the greatest challenge in the design of structural metallic materials. Composite materials in various forms have been widely studied due to their versatility [ 1 , 2 , 3 , 4 , 5 ]. To obtain a metallic material with both high strength and high ductility, numerous studies have been conducted to produce laminated metal composites (LMCs) by combining one metal with high strength and another metal with high ductility [ 6 , 7 ].…”