In Situ Synthesis of (TiC + Ti₃SiC₂ + Ti₅Si₃)/Ti6Al4V Composites with Tailored Two‐scale Architecture

Abstract

In situ TiC particle, Ti 3 SiC 2 bar and ultrafine Ti 5 Si 3 needle reinforced Ti6Al4V (TiCþTi 3 SiC 2 þTi 5 Si 3 )/Ti6Al4V) composites with a tailored distribution were sucessfully designed and fabricated. The first-scale tailored architecture of reinforcement is the in situ synthesized Ti 3 SiC 2 bars and nearequiaxed TiC particles on the network boundary around Ti6Al4V particles. The secondary-scale architecture is the ultrafine Ti 5 Si 3 needles precipitated in intergranular b phase of center Ti6Al4V matrix particle. The results showed that the two-scale tailored architecture of different reinforcements can significantly improve strength remained with moderate ductility of the composites.

Powder metallurgy fabrication and heat treatment modification of (TiBw+(TiZr)<sub>5</sub>Si<sub>3</sub>)/TA15 composites

“…[32,33] . 进一步观察发现, 网状结构内部基体中的α/β 相界处或β相附近分布着尺寸细小的第二相析出增强 相, 这对β相起到了细化作用, 使得制备的钛基复合材 料中的β相发生了明显细化 [24,34] . .…”

Recent Advances in the Design and Fabrication of Strong and Ductile (Tensile) Titanium Metal Matrix Composites

“…[21,36,42,43,85,[145][146][147] Figure 14 shows the extraordinary tensile properties of Ti-6Al-4V reinforced with TiB nanowires compared with those reinforced with micro-sized ceramics and mill-annealed and STA Ti-6Al-4V and Ti-10V-2Fe-3V. [1,24,26,36,38,41,[148][149][150][151][152][153] As suggested by Equation (3), increasing the aspect ratio of reinforcements is another efficient strategy to enhance the mechanical properties of TiMMCs. [154] Koo et al [21] showed that the yield strength of Ti-6Al-4V/1 vol% TiB increased from 900 to 1075 MPa when the aspect ratio of TiB whiskers was increased Figure 13.…”

Revealing High-Temperature Oxidation and Tensile Behaviors along with Underlying Mechanisms of a Titanium Alloy with Precipitated Titanium Silicide

“…In addition, silicide ceramics demonstrated better deformation characteristics than other compounds like carbides and borides [20]. Specifically, the silicide of Ti 5 Si 3 exhibits a high melting point, low density, pronounced creep resistance, high fracture toughness over 1000 • C, good oxidation resistant behavior, and a thermal expansion coefficient closely matching that of titanium [21][22][23]. In this context, this work presents the investigation of a titanium alloy incorporating titanium silicide precipitates.…”