Structure and Properties of Ti/TiB Metal-Matrix Composite after Isothermal Multiaxial Forging
S. Zherebtsov, M. Ozerov, N. Stepanov, M. Klimova
Belgorod State University, Pobeda-85, Belgorod 308015, Russia
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Microstructure and mechanical properties of a Ti/TiB metal-matrix composites after multiaxial forging at 850° to the true strain ε=5.2 were studied. The composite with 17 vol.% of TiB was produced via spark plasma sintering at 1000°. Mechanical behavior in terms of aggregated σ-Σε curves during the multiaxial forging demonstrated a pronounced softening following by a steady-like flow stage. The length of TiB whiskers considerably decreased after the first step of the multiaxial forging and then changed insignificantly. The microstructure after the MAF consisted of dislocation-free Ti matrix areas of ~1 μm in diameter and areas with high density of TiB whiskers and high dislocation density. The forging resulted in a considerable increase in ductility of the Ti/TiB metal-matrix composites at room and elevated temperatures without loss in strength.

DOI:10.12693/APhysPolA.134.695
PACS numbers: 81.20.Ev, 81.40.Gh, 81.40.Lm, 81.70.Bt