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Open AccessArticle

Effect of High-Pressure Torsion on Structure and Microhardness of Ti/TiB Metal–Matrix Composite

1
Laboratory of Bulk Nanostructured Materials, Belgorod State University, Belgorod 308015, Russia
2
Karlsruhe Institute of Technology, Institute of Nanotechnology, 76021 Karlsruhe, Germany
*
Author to whom correspondence should be addressed.
Metals 2017, 7(11), 507; https://doi.org/10.3390/met7110507
Received: 19 October 2017 / Revised: 10 November 2017 / Accepted: 13 November 2017 / Published: 16 November 2017
Effect of high-pressure torsion (HPT) at 400 °C on microstructure and microhardness of a Ti/TiB metal–matrix composite was studied. The starting material was produced by spark plasma sintering of a mixture of a pure Ti and TiB2 (10 wt %) powders at 1000 °C. The microstructure evolution during HPT was associated with an increase in dislocation density and substructure development that resulted in a gradual microstructure refinement of the Ti matrix and shortening/redistribution of TiB whiskers. After five revolutions, a nanostructure with (sub) grain size of ~30 nm was produced in Ti matrix. The microhardness increased with strain attaining the value ~520 HV after five revolutions. The contribution of different hardening mechanisms into the hardness of the Ti/TiB metal–matrix composite was quantitatively analyzed. View Full-Text
Keywords: metal–matrix composite; high-pressure torsion; microstructure evolution; microhardness metal–matrix composite; high-pressure torsion; microstructure evolution; microhardness
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MDPI and ACS Style

Zherebtsov, S.; Ozerov, M.; Stepanov, N.; Klimova, M.; Ivanisenko, Y. Effect of High-Pressure Torsion on Structure and Microhardness of Ti/TiB Metal–Matrix Composite. Metals 2017, 7, 507.

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