Mechanical Behavior and Microstructure Evolution of a Ti-15Mo/TiB Titanium–Matrix Composite during Hot Deformation

Abstract

A Ti-15Mo/TiB titanium–matrix composite (TMC) was produced by spark plasma sintering at 1400 °C under a load of 40 MPa for 15 min using a Ti-14.25(wt.)%Mo-5(wt.)%TiB2 powder mixture. Microstructure evolution and mechanical behavior of the composite were studied during uniaxial compression at room temperature and in a temperature range of 500–1000 °C. At room temperature, the composite showed a combination of high strength (the yield strength was ~1500 MPa) and good ductility (~22%). The microstructure evolution of the Ti-15Mo matrix was associated with the development of dynamic recovery at 500–700 °C and dynamic recrystallization at higher temperatures (≥800 °C). The apparent activation energy of the plastic deformation was calculated and a processing map for the TMC was constructed using the obtained results.

MICROSTRUCTURE AND TENSILE PROPERTIES OF TiNbZr ALLOY-BASED COMPOSITES, REINFORCED WITH BORIDES

“…In this case, the structure and mechanical properties of metal-matrix composites is a function of many variables, including method (casting or powder metallurgy) and conditions of production and the volume fraction of borides. These issues have been widely studied for titanium-based composites with an hcp lattice [3] and, to a much lesser extent, for composites based on bcc beta titanium alloys [4]. However metal-matrix composites with an MEA/HEA matrix [5] have been hardly studied so far.…”

Titanium Alloys and Titanium-Based Matrix Composites

“…The results of hot compression tests at a temperature range of 715-840 • C and strain rate range of 0.001-1 s −1 were the basis of a processing maps calculation, enabling the determination of the instability regions in the process and improvement of forging effectiveness. Zherebtsov et al [2] analyzed the deformation behavior of Ti-15Mo/TiB composite produced by spark plasma sintering. They found its gradual softening with an increase in deformation temperature in the range of 500-1000 • C to be associated with the dynamic recovery and recrystallization processes, in addition to the reorientation and shortening of TiB whiskers.…”

Multiscale Architecture and Superior High‐Temperature Performance of Discontinuously Reinforced Titanium Matrix Composites

“…[ 106 ] It worth pointing out that through introducing Mo and TiB reinforcement, Zherebtsov et al synthesized the TiB reinforced Ti–15Mo (β‐type Ti alloy matrix) composite by SPS, which presented a yield strength of ≈1500 MPa and good ductility of ≈22% through compression test. [ 107 ] In addition, the proceeding hot rolling, [ 108 ] isothermal multiaxial forging, [ 109 ] and severe plastic deformation processing routes [ 110 ] were also reported as effective ways to further improve the ductility by dynamic recrystallization and grain refinement.…”