Linear complexions: Confined chemical and structural states at dislocations
Linear complexions: Confined chemical and structural states at dislocations
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DOI：
10.1126/science.aab2633
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发表时间：
2015-09-04
期刊：
影响因子：
56.9
通讯作者：
Raabe, D.
中科院分区：
文献类型：
--
作者：
Kuzmina, M.;Herbig, M.;Raabe, D.
5000年来，金属一直是人类最基本的材料，因为它们具有延展性和强度。称为位错的线性缺陷携带原子剪切步骤，使其能够成形。我们报告的化学和结构状态限制在位错。在体心立方Fe-9原子% Mn合金中，我们发现Mn在加热过程中在位错核心处偏析，随后形成面心立方区域，但没有进一步生长。这些区域与基体处于平衡状态，并且仍然局限于具有共格界面的位错核心。这种现象类似于界面稳定的结构状态，称为肤色。一立方米的应变合金包含高达一光年的位错长度，这表明线性络合物可以通过偏析和受限的结构状态为纳米结构合金提供机会。
For 5000 years, metals have been mankind's most essential materials owing to their ductility and strength. Linear defects called dislocations carry atomic shear steps, enabling their formability. We report chemical and structural states confined at dislocations. In a body-centered cubic Fe-9 atomic percent Mn alloy, we found Mn segregation at dislocation cores during heating, followed by formation of face-centered cubic regions but no further growth. The regions are in equilibrium with the matrix and remain confined to the dislocation cores with coherent interfaces. The phenomenon resembles interface-stabilized structural states called complexions. A cubic meter of strained alloy contains up to a light year of dislocation length, suggesting that linear complexions could provide opportunities to nanostructure alloys via segregation and confined structural states.