Abstract
In situ synthesized TiB2-reinforced TiAl composites usually possess high strength. However, it is very expensive to use B powder to synthesize TiB2 particles. Moreover, the strength enhancement of TiB2/TiAl composite is generally at the cost of plasticity. In this study, in situ dual reinforcement TiB2-Ti2AlC/TiAl composites were fabricated by using B4C powder as the B and C source, which greatly reduces the potential production cost. The 6 vol. % TiB2-Ti2AlC/TiAl composite fabricated by using the Ti-Al-B4C system shows greatly improved compressive properties, i.e., 316 MPa and 234 MPa higher than those of TiAl alloy and with no sacrifice in plasticity.
Highlights
Composite technology, i.e., introducing stiff and hard particle reinforcements, is an effective approach to improve the strength of TiAl alloy [1,2,3,4,5]
In our previous work [16], we focused on the issues of the effect of B4C size on the fabrication of in situ TiB2-Ti2AlC/TiAl composites
Particles was found, which indicated that TiB2 and Ti2AlC particles could be synthesized simultaneously in the Ti-Al-B4C system and that in situ dual reinforcement TiB2-Ti2AlC/TiAl composites could be successfully fabricated by using B4C as the B and C source
Summary
I.e., introducing stiff and hard particle reinforcements, is an effective approach to improve the strength of TiAl alloy [1,2,3,4,5]. Introducing TiB2 and Ti2AlC particles simultaneously into TiAl matrix is expected to fabricate the in situ dual reinforcement TiB2-Ti2AlC/TiAl composite with further improved strength and excellent plasticity. B4C powder can offer C to synthesize Ti2AlC particles It is a more cost-effective way to fabricate the in situ dual reinforcement TiB2-Ti2AlC/TiAl composite by using. The compression strength of the composites reached 2058 MPa, and the fracture strain was about 0.16% Compared with these above methods, the method of combustion synthesis and hot press consolidation represents an in situ processing technique for the preparation of composites, which takes advantage of the low energy requirement, cleaner particle-matrix interface, one-step forming process, density and high purity of the products. The reinforcing effect of the TiB2-Ti2AlC particulates synthesized from Ti-Al-B4C and Ti-Al-B-C systems was compared
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