Abstract
Interaction of the Ti-C with titanium alloys of a + β and pseudo a classes and formation of the reaction layer at the interface have been investigated. We used titanium a + b alloys VT6 (Ti-Al-V) and VT8 (Ti-Al-Mo-Si) as well as pseudo a alloy VT20 (Ti-Al-Zr-Mo-V). The structure and composition of the interfaces were investigated by means of TEM in the scanning beam mode and energy dispersive spectroscopy. It is ascertained that already at the stage of production of the samples by thermal diffusion joining, interphase chemical interaction and formation of the reaction layers occurred. The reaction layer consists of distinct regions of small crystals (nanocrystals TiC of 10-50 nm in size) and large grains of Ti8C5 of 100-500 nm in size. Most of the reaction layer consists of large grains ofTi8C5. It was found that the average thickness of the reaction layer varies depending on the Ti alloy type and is ~0.89 μm (VT6 alloy), ~0.97 μm (VT8 alloy), and ~0.51 μm (VT20 alloy). Additional heat treatment of the samples leads to increasing the thickness of the reaction layer in all Ti-C/Ti alloy systems due to the growth of large grains of titanium carbide.
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