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Effect of high-pressure torsion on structure and properties of Ti-15Mo/TiB metal-matrix composite

Zherebtsov, S.; Ozerov, M.; Klimova, M.; Stepanov, N.; Vershinina, T.; Ivanisenko, Y.; Salishchev, G.

Abstract:
The microstructure and microhardness evolution of a Ti-15(wt.%)Mo/TiB metal-matrix composite (MMC) during high-pressure torsion (HPT) at 400 °C was studied. The composite was fabricated by spark plasma sintering of a Ti, Mo and TiB2 powders mixture at 1200 °C. In the initial condition, the structure of the composite consisted mainly of body-centered cubic (bcc) Ti solid solution and TiB whiskers. An increase in dislocation density, a considerable decrease in a grain size in the bcc Ti matrix, and breaking/rearrangement of the TiB whiskers were observed during HPT. The (sub)grain size in the bcc Ti matrix attained after 1 revolution was ~75 nm and then gradually decreased to ~55 nm after 5 revolutions. The TiB particle sizes after 5 revolutions was found to be 130–210 nm. The microhardness increased with strain from 575 HV in the initial state to 730 HV after 5 revolutions. Various hardening mechanisms’ contributions in the Ti-15Mo/TiB were evaluated.

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Verlagsausgabe §
DOI: 10.5445/IR/1000089109
Veröffentlicht am 11.01.2019
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Jahr 2018
Sprache Englisch
Identifikator ISSN: 1996-1944
urn:nbn:de:swb:90-891091
KITopen-ID: 1000089109
HGF-Programm 43.22.01 (POF III, LK 01)
Erschienen in Materials
Band 11
Heft 12
Seiten Art. Nr.: 2426
Schlagworte metal-matrix composite; titanium, high-pressure torsion, nanostructure, microstructure evolution, microhardness
Nachgewiesen in Scopus
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