Net-Shaping of <I>In-situ</I> Synthesized (TiC+TiB) Hybrid Titanium Matrix Composites

Abstract

The aim of this study is to establish an effective technique for the economic net-shape forming of in-situ synthesized titanium matrix composites (TMCs) using a casting route. In-situ synthesis and investment casting of TMCs were carried out in a horizontal centrifugal vacuum induction melting furnace. The synthesized (TiC+TiB) TMCs were examined using scanning electron microscopy, electron probe microanalyzer and X-ray diffraction, and through thermodynamic calculations. No melts-mold reaction was observed between the synthesized composites and a SKK mold, since the SKK mold comprised both interstitial and substitutional melts-mold reaction products. The results of the in-situ synthesis and the investment casting of TMCs show that our casting route can be an effective approach for the economic net-shape forming of TMCs.

Characterization of (TiB+TiC)/TC4 in situ titanium matrix composites prepared by laser direct deposition

“…Thus it will be very favourable to develop a near net shaping process for TMCs. Sung and Kim (2005) presented an effective approach for net-shaping of in situ synthesized (TiC + TiB) TMCs using a casting route.…”

Microstructure evolution of in-situ synthesised (TiB + TiC) particulate reinforced titanium matrix composites casting

“…In the casting process, net-shape forming is difficult to obtain due to high reactivity in the molten state and low fluidity of the melts. 11,12 Alternatively, net-shape forming can provide an economical advantage and stability of the final casting. In-situ syntheses, such as SHS and XD™ techniques that are known to use the reaction between the matrix and additional elements, assures the homogeneous distribution of reinforcements and the clean interface between the matrix and reinforcement.…”

In Situ Synthesis of TiAl Matrix Composites by Melting Route

“…Therefore in this study TiAl alloys and boron carbide were in-situ synthesized by melting route in plasma arc melting furnace [3,4]. Sung et al proposed fabrication methods of titanium matrix composites that the powder metallurgy has a limitations such as freedom of size, shape and soundness [5,6,7]. Consquently, the fabrication of titanium matrix composites has to be done by cost effective melting route.…”