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Metallic materials, especially steel, underpin transportation technologies.High-manganese twinning induced plasticity (TWIP) austenitic steels exhibitexceptional strength and ductility from twins, low-energy microstructuraldefects that form during plastic loading. Their high-strength could helplight-weighting vehicles, and hence cut carbon emissions. TWIP steels arehowever very sensitive to hydrogen embrittlement that causes dramatic losses ofductility and toughness leading to catastrophic failure of engineering parts.Here, we examine the atomic-scale chemistry and interaction of hydrogen withtwin boundaries in a model TWIP steel by using isotope-labelled atom probetomography, using tritium to avoid overlap with residual hydrogen. We revealco-segregation of tritium and, unexpectedly, oxygen to coherent twinboundaries, and discuss their combined role in the embrittlement of thesepromising steels.

Hydrogen embrittlement of twinning-induced plasticity steels: contribution of segregation to twin boundaries