Abstract
Metallugy Metals have a number of famous properties, including good strength and ductility. Controlling these properties frequently requires modifying the number and type of structural defects in a metal alloy. Kuzmina et al. produced a new type of defect, called a linear complexion, in magnesium-rich steel (see the Perspective by Kaplan). These complexions are chemically and structurally distinct regions located inside a linear defect and are isolated from the bulk by a layer of dislocations. The discovery suggests a new path for targeting defects and improving alloy development. Science , this issue p. [1080][1]; see also p. [1059][2] [1]: /lookup/doi/10.1126/science.aab2633 [2]: /lookup/doi/10.1126/science.aac9623
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