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A new pathway to onion-like carbon with narrow, regular and connected pores overcomes the trade-off between power delivery and energy storage capacity in supercapacitors.

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A fully martensitic Ti alloy consisting entirely of hexagonal-close-packed α was produced by selective laser melting (SLM), exhibiting an impressive combination of high strength and excellent ductility. A small quantity of body-centred-cubic β formed at some large primary α plates oriented at ∼ 45°to the tensile direction was found responsible for early fracture owing to α /β strain incompatibility. Properly selected SLM parameters resulted in a β-free microstructure containing α /α interfaces only, preventing premature fracture. Consequently, large plastic deformation was enabled, creating randomly oriented nano-α crystals. The investigation dispels the myth that α is inherently brittle. IMPACT STATEMENT A fully martensitic α Ti-6Al-4V with an impressive combination of high ductility and strength was produced using selective laser melting, dispelling the myth that α is inherently brittle.