Effect of Mn, Fe and Co on the compression strength and ductility of in situ nano-sized TiB2/TiAl composites

Abstract

The element of Fe can enhance the strength of TiB2/TiAl composite, but it is detrimental to the ductility of the composite due to the existence of large bulk TiB2 phase at grain boundary. The element of Mn is beneficial to the ductility of TiB2/TiAl composite, of which the fracture strain increases from 15.9 to 17.9 % with the addition of 2 at.% Mn. The element of Co can improve the strength and ductility of TiB2/TiAl composite simultaneously. With the addition of 2 at.% Co, the ultimate compression strength of TiB2/TiAl composite increases from 1829 to 1906 MPa and the fracture strain increases from 15.9 to 17.2 %.

Ceramic-Reinforced γ-TiAl-Based Composites: Synthesis, Structure, and Properties

“…At the same time, Ti 2 AlC is not efficient as a reinforcing phase. This observation is in good agreement with the data presented in [ 50 , 51 ], showing that if a composite contains only TiB 2 particles as a reinforcing phase, the increase of the compressive strength can be more significant compared to the material reinforced by both TiB 2 and Ti 2 AlC.…”

“…The highest compressive strength reached 1600 MPa for the material reinforced by TiB 2 layers. According to the literature [ 50 , 51 , 52 ], the typical value of the ultimate compressive strength for the binary two-phase TiAl alloy equals to 1415–1430 MPa. Thus, addition of TiB 2 contributes to the strengthening of a binary TiAl.…”