The design of Ti–Cu–Ni–Zr titanium alloy solder: thermodynamic calculation and experimental validation

Microstructure and shear property of high-temperature brazing of TiAl alloy and 316L stainless steel with a Ni-based amorphous filler

“…Depending the morphology difference, the intermediate layer is mainly composed of two types of blocking: dendrite-like structures labelled with C and small ball-shaped phases marked with D, as well as a number of extremely fine phases marked with E. EDS and XRD results indicated that dendrite phase C was determined to be γ-(Fe,Ni) and D was a complex of Ni 3 (Ti, Zr) and Ni 3 Nb phases. According to the Ti-Nb, Nb-Ni and Ti-Ni binary phase diagrams as well as the Ti-Nb-Ni ternary phase diagram, during solidification, this region first formed the supersaturated solid solution phases γ-Ni (Nb, Ti, Al), and as the temperature decreased, the solubility of supersaturated solid solutions decreased, precipitating Ni 3 (Ti, Nb) from the supersaturated solid solution phases (Zhang et al, 2022b). The phases within region E are relatively small and contain a variety of major elements, so it is difficult to determine its composition only by XRD and SEM.…”

“…Amorphous solder has attracted substantial attention for its special structure and concomitant excellent mechanical properties, which have been of special scientific and engineering value (Yang et al, 2021;Zhang et al, 2022b;Zhao et al, 2022). The thermodynamically nonsteady structure of amorphous solders is conducive to accelerating the diffusion of atoms and interfacial reactions during high-temperature brazing, reducing the temperature required for connection, thereby reducing the residual stress in the joint and improving the joint strength, but it is difficult to reduce the heat resistance temperature of the joint after brazing.…”

Cold dwell behaviour of Ti6Al alloy: Understanding load shedding using digital image correlation and dislocation based crystal plasticity simulations

“…Cold dwell fatigue mainly occurs in α-Ti alloys [10]. The deformation of HCP crystal structure is highly anisotropic due to its low symmetric elasticity and different slip system strengths [11,12,13,14,15,16]. During a stress dwell, local time dependent plasticity could occur in grains well orientated for basal and prismatic slip ("soft" grains).…”