Elsevier

Scripta Materialia

Volume 183, 1 July 2020, Pages 28-32
Scripta Materialia

In situ reactions during direct laser deposition of Ti-B4C composites

https://doi.org/10.1016/j.scriptamat.2020.03.021Get rights and content

Abstract

Direct laser deposition of a mixture of titanium (Ti) and boron-carbide (B4C), using the laser engineered net shaping process, results in a complex multi-phase Ti matrix composite due to the incipient interfacial reactions between liquid titanium and solid/partially melted B4C. Detailed microstructural characterization, at multiple length scales, reveals that titanium boride (TiB) precipitates are the initial reaction product which act as heterogeneous nucleation sites for TiC precipitates. Both the TiB and TiC precipitates in turn act as heterogeneous nucleation sites for fine β-Ti grains, within the retained liquid titanium, which eventually transform into fine equiaxed α-Ti grains comprising the matrix.

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Declaration of Competing Interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Acknowledgments

The authors acknowledge part financial support for this work from two different cooperative agreements between the U.S. Army Research Laboratory (ARL) and the University of North Texas; W911NF-19-2-0011 and W911NF-16-2-0189.

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