High temperature deformation with diffusional and plastic accommodation in Ti/TiB whisker-reinforce in-situ composites

Titanium-boride eutectic materials: Phase equilibria and properties of alloys in the Ti-rich portion of the Ti–Sn–B system

“…At intermediate temperatures, ∼300 to 500-700 • C the energy is about 20-40 kJ/mole, corresponding to interaction of dislocations with interstitial atoms. At higher temperatures the activation energy is ∼120 kJ/mole (up to ∼160 kJ/mole for alloys rich in Sn), which coincides with the data on the interface diffusion for ␣Ti [11,12]. Of the two breakings, the second one is of special interest as an incipient temperature of sharp softening (so-called "strength break-down" temperature).…”

Observation of weakened and strengthened creep behavior in Ti/TiB(w) composites at high temperatures

“…The authors have tried to observe those phenomena in Ti/TiB aligned-whisker-reinforced in situ composite, but were unable to observe composite weakening clearly for Ti/TiB composites below 1123 K where the matrix is ␣-phase [14]. Herein, we introduce the results of weakening with increasing volume fraction of reinforcements under low strain rates and strengthening under high strain rates at 1473 K for a ␤-phase matrix.…”

“…When the heterogeneous stresses around reinforcements are accommodated by free sliding and rapid diffusion along the interface, the load transfer effect will vanish. As a result, the metal matrix composites even with dispersing reinforcements become weaker than the monolithic matrix at high temperatures [14].…”

Rationalization of Plastically-Accommodated Steady-State Creep of a Composite

“…Experimental observations of plastically-accommodated creep have been presented in separate papers using special model materials, in situ TiB whisker-reinforced -Ti matrix composites [31][32][33] and spherical Al 2 O 3 particle-reinforced AlMg matrix composite through ingot metallurgy. 34) …”