Role of disordered bipolar complexions on the sulfur embrittlement of nickel general grain boundaries

Nature Communications
Tao HuJian Luo

Abstract

Minor impurities can cause catastrophic fracture of normally ductile metals. Here, a classic example is represented by the sulfur embrittlement of nickel, whose atomic-level mechanism has puzzled researchers for nearly a century. In this study, coupled aberration-corrected electron microscopy and semi-grand-canonical-ensemble atomistic simulation reveal, unexpectedly, the universal formation of amorphous-like and bilayer-like facets at the same general grain boundaries. Challenging the traditional view, the orientation of the lower-Miller-index grain surface, instead of the misorientation, dictates the interfacial structure. We also find partial bipolar structural orders in both amorphous-like and bilayer-like complexions (a.k.a. thermodynamically two-dimensional interfacial phases), which cause brittle intergranular fracture. Such bipolar, yet largely disordered, complexions can exist in and affect the properties of various other materials. Beyond the embrittlement mechanism, this study provides deeper insight to better understand abnormal grain growth in sulfur-doped Ni, and generally enriches our fundamental understanding of performance-limiting and more disordered interfaces.

References

Aug 24, 2004·Nature Materials·Gerd DuscherManfred Rühle
Dec 24, 2004·Nature·Rainer SchweinfestMichael W Finnis
Jan 8, 2005·Science·Masatake YamaguchiHideo Kaburaki
Oct 10, 2006·Physical Review Letters·Ming TangRowland M Cannon
May 7, 2009·Proceedings of the National Academy of Sciences of the United States of America·Hao ZhangJames A Warren
Mar 2, 2010·Nature Materials·Alvin L-S ChuaAdrian P Sutton
May 21, 2010·Physical Review Letters·Hsiu-Pin ChenZaoshi Yuan
Apr 9, 2011·Science·Martin P Harmer
Sep 24, 2011·Science·Jian LuoMartin P Harmer
Feb 19, 2016·Nature Communications·Amirhossein KhalajhedayatiTimothy J Rupert

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