Microstructure and Mechanical Behaviors of Titanium Matrix Composites Containing In Situ Whiskers Synthesized via Plasma Activated Sintering

Abstract

In this paper, titanium matrix composites with in situ TiB whiskers were synthesized by the plasma activated sintering technique; crystalline boron and amorphous boron were used as reactants for in situ reactions, respectively. The influence of the sintering process and the crystallography type of boron on the microstructure and mechanical properties of composites were studied and compared. The densities were evaluated using Archimedes’ principle. The microstructure and mechanical properties were characterized by SEM, XRD, EBSD, TEM, a universal testing machine, and a Vickers hardness tester. The prepared composite material showed a high density and excellent comprehensive performance under the PAS condition of 20 MPa at 1000 °C for 3 min. Amorphous boron had a higher reaction efficiency than crystalline boron, and it completely reacted with the titanium matrix to generate TiB whiskers, while there was still a certain amount of residual crystalline boron combining well with the titanium matrix at 1100 °C. The composite samples with a relative density of 98.33%, Vickers hardness of 389.75 HV, compression yield strength of up to 1190 MPa, and an ultimate compressive strength of up to 1710 MPa were obtained. Compared with the matrix material, the compressive strength of TC4 titanium alloy containing crystalline boron and amorphous boron was increased by 7.64% and 15.50%, respectively.

Mechanical properties of near alpha titanium alloys for high-temperature applications - a review

“…These groups of alloys have the potential for use in temperatures up to 700°C, but still maintain better strength and ductility. TiB W /Ti-1100 (Chandravanshi et al , 2011; Ma et al , 2017a), TiB W /Ti-64 (Roy and Suwas, 2014; Sun et al , 2018b; Wang et al , 2012), TiB W /VT18U (Gaisin et al , 2017), TiB W /IMI834 (Prasad et al , 2011b) and TiB W /Ti-60 (Wang et al , 2015b) have been investigated for mechanical properties at room and high temperature conditions. The research reported significant grain refinements coupled with superior tensile strength and elongations compared to their base alloys at both temperatures.…”

Research on Microscopic Properties of TiBw/TC4 Composites for Drilling Process

“…Based on the volume fraction 8.5% TiB whisker-reinforced titanium matrix composites in the literature [15], spherical TC4 powder with a particle size of 120–220 μm and TiB 2 powders with a particle size of 1–5 μm were mixed at a certain ratio, then TiB w /TC4 composites were prepared by high temperature hot pressing sintering. The TC4 powder softened and densified between the particles due to the high temperature and the original spherical TC4 powder became a polyhedron.…”

The influence of tool quality on the machining of additive manufactured and powder metallurgy titanium alloys

“…1 However, the high compressive properties of PM titanium composites containing in-situ whiskers have been reported. 6 AM technology is characterized by its layer-by-layer manufacturing method, also widely known as 3D printing, providing metallic components with improved accuracy and surface finish with less set-ups. 7,8 AM fabrication methods are classified into a powder bed system, powder feed system, as well as a wire feed system.…”