What does this research mean for the field?

While C103 acts as a successful metallurgical bridge to Ti64 in functionally graded materials with superior strength and elongation, its transition to GRCop-42 results in brittle cleavage failure due to a thermal sink effect and the formation of unforeseen Cu-Hf compounds. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To evaluate the use of C103 as an intermediate metallurgical bridge to avoid brittle copper-titanium intermetallics when joining Ti64 and GRCop-42 via laser powder directed energy deposition.

September 5, 2026Journal of materials research/Pratt's guide to venture capital sourcesOpen Access

Laser powder directed energy deposition fabrication and tensile sandwich evaluation of Ti64-C103-GRCop-42 functionally graded materials

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Authors

DRDaniel Rubio-EjchelUniversity of Michigan MLMichael LesterUniversity of Tulsa KRKenHee RyouNorthwestern University

Discussion

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Implication

Experimental study demonstrates interfacial mechanics of Ti64-to-GRCop-42 gradients using a C103 bridge, indicating design limits from brittle copper-hafnium phases.

Key Points

To evaluate the use of C103 as an intermediate metallurgical bridge to avoid brittle copper-titanium intermetallics when joining Ti64 and GRCop-42 via laser powder directed energy deposition.
Designed unidirectional composition gradients informed by thermodynamic calculations.
Fabricated crack-free graded samples using laser powder directed energy deposition (LP-DED).
Characterized interfacial mechanical properties and deformation using a tensile sandwich methodology combined with digital image correlation.
Ti64–C103 interfaces achieved high mechanical strength with 45% elongation.
The GRCop-42 to C103 transition experienced brittle cleavage failure driven by rapid cooling from a thermal sink effect and the formation of unexpected Cu–Hf intermetallic compounds.

Cite This Study

Rubio-Ejchel et al. (2026) studied this question.

synapsesocial.com/papers/6a9bd3e16b95aff0620eb1d4 https://doi.org/10.1557/s43578-026-01964-w

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Implication

Experimental study demonstrates interfacial mechanics of Ti64-to-GRCop-42 gradients using a C103 bridge, indicating design limits from brittle copper-hafnium phases.

Laser powder directed energy deposition fabrication and tensile sandwich evaluation of Ti64-C103-GRCop-42 functionally graded materials

Discussion

Member takes

Implication

Key Points

Cite This Study

Laser powder directed energy deposition fabrication and tensile sandwich evaluation of Ti64-C103-GRCop-42 functionally graded materials

Discussion

Member takes

Implication

Key Points

Cite This Study

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