Solid-state reaction mediated microstructural evolution in a spark plasma sintered in situ Ti–B4C composite

Nartu, Mohan Sai Kiran Kumar Yadav; Banerjee, Sucharita; Chesetti, Advika; Rodriguez, Jonathan; Yadav, Surekha; Scharf, Thomas; Banerjee, Rajarshi

doi:10.1016/j.msea.2023.145601

Solid-state reaction mediated microstructural evolution in a spark plasma sintered in situ Ti–B₄C composite

Journal Article · Tue Aug 22 00:00:00 EDT 2023 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2023.145601· OSTI ID:2246642

^[1]; Banerjee, Sucharita ^[2]; ^[3]; ^[3]; Yadav, Surekha ^[3]; Scharf, Thomas ^[3]; ^[3]

Univ. of North Texas, Denton, TX (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Univ. of North Texas, Denton, TX (United States); Univ. of Texas, Austin, TX (United States)
Univ. of North Texas, Denton, TX (United States)

For this study, a novel porosity-free in situ Ti–B₄C composite was fabricated via spark plasma sintering (SPS). Detailed analysis of the phase evolution, coupling results from XRM, XRD and SEM-EBSD-EDS, indicate that primarily TiB₂ precipitates formed due to the in-situ reactions between the boron-carbide and titanium powders. The precipitation of TiB₂ resulted in the formation of a graphitic C-rich thin layer circumscribing the partially reacted B₄C particles. Further progression of the in-situ reaction leads to the out-diffusion of the excess carbon from the B₄C particles, across the graphite and TiB₂ phases, forming TiC upon reacting with the titanium matrix. Therefore, the final microstructure primarily consisted of TiB₂, TiC, and partially reacted B₄C phases, with small amounts of TiB, α-Ti, and graphite. Furthermore, the microstructure in these SPS processed in situ composites appeared to be the product of a solid-state Ti–B₄C diffusion couple, substantially different from their fusion-based additively manufactured counterparts. Nano-indentation tests revealed a remarkably high average hardness of ~25 GPa for this SPS-processed Ti–B₄C composite and comparable (with literature) phase-specific hardness and modulus values for the constituent TiB₂, TiC, and B₄C phases.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 2246642

Report Number(s):: PNNL-SA--189437

Journal Information:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Journal Name: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing Vol. 885; ISSN 0921-5093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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Spark plasma sintering
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Solid-state reaction mediated microstructural evolution in a spark plasma sintered in situ Ti–B4C composite

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Solid-state reaction mediated microstructural evolution in a spark plasma sintered in situ Ti–B₄C composite