4.6 Article

The Influence of Carbon Sources on the Microstructures of In Situ-Synthesized TiC in Al Melts

Journal

MATERIALS
Volume 15, Issue 13, Pages -

Publisher

MDPI
DOI: 10.3390/ma15134610

Keywords

diamond; graphite; Al matrix composites; reactive wetting

Funding

  1. Natural Science Foundation of Hebei Province [E2022502011]
  2. National Key R&D Program of China [2019YFB1901301]
  3. Fundamental Research Funds for the Central Universities, China [2022MS092]
  4. Science and Technology Planning Project of Baoding Municipality [2172P005]

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Graphite and diamond were successfully introduced into Al melts and TiC was in situ-synthesized based on reactive wetting. The microstructures of the prepared TiC-reinforced Al composites varied with the change in carbon sources and their sizes.
In this work, graphite and diamond are successfully introduced into Al melts and TiC is in situ-synthesized based on reactive wetting. It is found that the microstructures of the prepared TiC-reinforced Al composites are varied with the change in carbon sources and their sizes. TiC particles tend to form agglomerations in the composites prepared by both graphite and diamond, but the size of the TiC particles as well as their agglomerations will decrease with the decrease in the carbon source size. In addition, the Ti-C reaction is also difficult to fully carry out due to the influence of the Al-C reaction. As a result, in addition to TiC particles, Al4C3 will also be present in the composites prepared by graphite, especially when the size of graphite is large. As for the composites prepared by diamond, diamond@Al4C3@TiC core-shell particles will form when the size of the diamond is large, such as 10 mu m in this work, and these particles will transform into Al4C3@TiC core-shell particles when the size of the diamond is decreased.

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