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Yu, Zhiyang; Cantwell, Patrick R.; Gao, Qin; Yin, Denise; Zhang, Yuanyao; Zhou, Naixie; Rohrer, Gregory S.; Widom, Michael; Luo, Jian; Harmer, Martin P.
Science (American Association for the Advancement of Science), 10/2017, Letnik: 358, Številka: 6359Journal Article
The properties of materials change, sometimes catastrophically, as alloying elements and impurities accumulate preferentially at grain boundaries. Studies of bicrystals show that regular atomic patterns often arise as a result of this solute segregation at high-symmetry boundaries, but it is not known whether superstructures exist at general grain boundaries in polycrystals. In bismuth-doped polycrystalline nickel, we found that ordered, segregation-induced grain boundary superstructures occur at randomly selected general grain boundaries, and that these reconstructions are driven by the orientation of the terminating grain surfaces rather than by lattice matching between grains. This discovery shows that adsorbate-induced superstructures are not limited to special grain boundaries but may exist at a variety of general grain boundaries, and hence they can affect the performance of polycrystalline engineering alloys.
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