Segregation-induced changes in grain boundary cohesion and embrittlement in binary alloys

Gibson, Michael A.; Schuh, Christopher A.

doi:10.1016/j.actamat.2015.05.004

Segregation-induced changes in grain boundary cohesion and embrittlement in binary alloys

Journal Article · Wed Jun 03 00:00:00 EDT 2015 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2015.05.004· OSTI ID:1548301

Gibson, Michael A. ^[1]; Schuh, Christopher A. ^[2]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Office of Scientific and Technical Information (OSTI)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Grain boundary embrittlement occurs when a solute enriches at a grain boundary and lowers its cohesive energy. While grain boundary enrichment is usually attributed to equilibrium segregation effects, most models of embrittlement consider either the energetics of decohesion or the equilibrium adsorption at the boundary, but not both phenomena together. We develop an approach for the change in cohesive energy of a grain boundary of a pure metal upon introduction of solute under conditions of equilibrium segregation prior to fracture. A heuristic grain boundary cohesion map is presented to delineate whether a given solute–solvent pair will exhibit weakening or strengthening of grain boundaries. The analysis helps to clarify that grain boundary embrittlement necessitates a solute that will both lower the cohesive energy of the boundary and segregate in the first place. The map reasonably captures known metal–metal embrittling pairs.

View Accepted Manuscript (DOE)

Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); US Office of Army Research

Grant/Contract Number:: SC0001299

OSTI ID:: 1548301

Alternate ID(s):: OSTI ID: 1251496

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Journal Issue: C Vol. 95; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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An Automated Computational Approach for Complete In-Plane Compositional Interface Analysis by Atom Probe Tomography Peng, Zirong; Lu, Yifeng; Hatzoglou, Constantinos Microscopy and Microanalysis, Vol. 25, Issue 2 https://doi.org/10.1017/s1431927618016112	journal	February 2019
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36 MATERIALS SCIENCE
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