|Fabrication of ultrafine-grained Ti-(5-50 wt.%)Al2O3 composites using high-pressure torsion|
EDALATI, K., IWAOKA, H., HORITA, Z., TANAKA, M., HIGASHIDA, K., FUJIWARA, H., AMEYAMA, K.
vol. 49 (2011), no. 1, pp. 85 - 91
Ti-matrix composites reinforced with Al2O3 fractions of up to 50 wt.% were fabricated by cold consolidation of powder mixtures using high-pressure torsion (HPT). The grain size of the Ti matrix was reduced to ≈100 nm. A relative density greater than ≈99 % was attained for composites containing up to 30 % Al2O3 following the rule of mixture. The Vickers microhardness increased with an increase in the Al2O3 fraction but the bending stress and ductility decreased. The HPT-processed composites exhibited an abrupt increase in the hardness when they were annealed at 800-900 K, indicating a successful achievement of consolidation.
titanium, Ti-matrix composite, ultrafine grain, high-pressure torsion, severe plastic deformation, consolidation
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