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

Zherebtsov, Sergey; Ozerov, Maxim; Klimova, Margarita; Moskovskikh, Dmitry; Stepanov, Nikita; Salishchev, Gennady

doi:10.3390/met9111175

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31 October 2019

10 Pages

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

and

Laboratory of Bulk Nanostructured Materials, Belgorod State University, Belgorod 308015, Russia

Centre of Functional Nanoceramics, National University of Science and Technology, Moscow 119049, Russia

Author to whom correspondence should be addressed.

Metals2019, 9(11), 1175;https://doi.org/10.3390/met9111175

This article belongs to the Special Issue Titanium Alloys and Titanium-Based Matrix Composites

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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.

Keywords:

titanium–matrix composite; deformation; microstructure evolution; mechanical properties

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