Linear complexions: Confined chemical and structural states at dislocations

Science
M KuzminaD Raabe

Abstract

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.

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Citations

Sep 24, 2015·Nature Materials·Philip Ball
Nov 23, 2016·Nature Communications·T M SmithM J Mills
Dec 8, 2016·Scientific Reports·Yangxin LiGuo-Zhen Zhu
Jan 14, 2017·Nature Communications·Jasper DriskoJohn Cumings
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Oct 1, 2017·Nature Communications·Jeongho HanYoung-Kook Lee
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