A titanium-polymer lattice can be much lighter than solid titanium and still carry compressive loads, while its internal polyurethane helps it float. But it is not a new titanium alloy or a universal replacement for foam: the reported results apply to one specialized, foam-filled lattice design and its laboratory tests.
What the titanium-polymer metamaterial is
The design studied by Noronha et al. combines Ti-6Al-4V, a titanium alloy, with expandable polyurethane (PU) foam. Laser-based powder bed fusion is used to make a lattice of hollow titanium struts; PU is injected into the struts’ internal channels. The lattice’s outer cells remain open.
That distinction matters. This is an engineered structure, not a bulk material with a new alloy composition. Its load-bearing behavior comes from the titanium architecture, while the foam-filled channels help exclude water and retain air. The open outer cells alone do not create a sealed buoyant volume: water can enter them.
How its strength and weight compare
The paper reports a bulk density of 0.27–0.32 g/cm³ for the tested hybrid lattices. This is the density of the overall lattice structure, not the density of solid titanium. In compression tests, the reported average properties were:
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| Property | Reported result for the tested hybrid lattice |
|---|---|
| Bulk density | 0.27–0.32 g/cm³ |
| Yield strength | 10.8 ± 0.3 MPa |
| Ultimate compressive strength | 12.4 ± 0.3 MPa |
| Elastic modulus | 567.9 ± 10.6 MPa |
These figures describe compression of the tested geometry; they are not tensile-strength values or general design allowables. The study describes deformation near the nodes around yield, followed by cracks around the top and bottom inlet holes at ultimate compressive strength. It reports fracture planes near 45 degrees and limited post-yield deformation. Those failure details, like the measured strengths, are specific to the tested specimens and loading.
What the density-matched comparison shows
For a hybrid lattice at a bulk density of 0.27 ± 0.02 g/cm³, the paper reports a yield strength of 10.3 ± 0.04 MPa. It compares that result with density-scaled estimates of about 5.5 MPa for HDPE and 6.9 MPa for 316L stainless steel.
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This is a comparison at matched density using scaled benchmarks—not a test of finished components with the same shape, manufacturing method, or test protocol. It does not establish that the lattice is stronger than every foam or metal design. The paper also reports an internal comparison: adding PU to the study’s unfilled Ti-6Al-4V hollow-strut lattices raised bulk density by 5.9%–7.3%, while increasing yield strength by 2.2%–3.6%, ultimate compressive strength by 2.5%–4.1%, and modulus by 1.3%–7.4%.
How it floats—and what happens when damaged
Buoyancy depends on the structure’s effective density and how much water it displaces without letting water replace the buoyant volume. Because the lattice’s exterior cells are open, they can fill with water; they should not be counted as sealed air pockets. The foam-filled channels inside the hollow struts provide the water-exclusion and air-retention mechanism. The paper therefore uses a skeletal-density framework for predicting buoyancy and reports a skeletal density below 1.0 g/cm³.
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The study reports that a Ti-6Al-4V+PU hybrid buoy floated in natural seawater and retained flotation through substantial structural damage. Buoyancy loss was associated mainly with compression and densification rather than immediate flooding. RMIT’s September 2026 institutional account separately says samples floated in freshwater for more than two months; that duration is a report about those samples, not proof of indefinite flotation or a commercial service life.
What seawater testing establishes
In the study’s seawater-immersion comparison, average yield strength decreased by 0.37 ± 0.12% and ultimate compressive strength by 0.86 ± 0.42% relative to unexposed comparison specimens. Reported mass loss was 0.15 ± 0.03%. These are laboratory results for the tested specimens and exposure conditions. They do not establish long-term marine durability, fatigue life, or a service-life guarantee.
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- Compressive strength :0.5-1.5MPA
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When this comparison is useful
The hybrid is most relevant when a design needs a combination of low structural density, compressive load capacity, and buoyancy. It should not be treated as a drop-in substitute for a foam block or solid titanium part. A meaningful engineering comparison needs to account for:
- Geometry and density: solid titanium, a porous lattice, foam, and a foam-filled hollow-strut lattice have different structures and effective densities.
- Loading: the cited strength figures are compressive; they do not answer how a component performs in tension or under repeated fatigue loading.
- Water exposure: open external cells can flood, while the study’s internal foam-filled channels are part of its buoyancy mechanism.
- Manufacturing: the reported approach uses laser-based powder bed fusion and injected expandable PU. The evidence does not establish production scale, cost, or equivalence to consumer retail foam.
The cited study does not provide a direct, same-geometry comparison against a standalone foam specimen or a conventional solid-titanium component under one shared test protocol. Nor does it establish lifecycle cost or commercial availability of the finished lattice. Its results are evidence for a promising specific architecture, not a broad ranking of titanium, foam, and metamaterials.
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Sources
- Noronha et al., “Breaking the Surface: Buoyant Metal–Polymer Open–Cell Hybrid Lattice Metamaterials,” Advanced Materials.
- RMIT University, “Engineers create a world-first in floating titanium,” September 2026.
- PubMed bibliographic record for the article.
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