Grain boundary segregation and precipitation in an Al-Zn-Mg-Cu alloy

High strength Al-alloys are highly susceptible to intergranular embrittlement, which severely limits their lifetime. This article summarizes our recent work on the effect of solute segregation in the precipitation behavior at grain boundaries (GBs) compared to the grain interiors. Solute segregation could accelerate the precipitation behavior at GBs, which causes the formation of coarse precipitates and precipitate free zones along GBs. Furthermore, the interplay of solute segregation and the local structure at GBs has been considered. We show that the distinct segregation and precipitation behavior occurs within the same GB, which makes the GB excess of solutes at one facet significantly higher than the other facet. This paper enriches the current understanding on the role of chemistry and structure at GBs related to intergranular fracture and corrosion resistance in high strength Al-alloys.

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The role of grain boundary character in solute segregation and thermal stability of nanocrystalline Pt–Au

Nanoscale ◽

10.1039/d0nr07180c ◽

2021 ◽

Vol 13 (6) ◽

pp. 3552-3563

Author(s):

Christopher M. Barr ◽

Stephen M. Foiles ◽

Malek Alkayyali ◽

Yasir Mahmood ◽

Patrick M. Price ◽

...

Keyword(s):

Thermal Stability ◽

Grain Boundary ◽

Boundary Segregation ◽

Solute Drag ◽

Solute Segregation ◽

Grain Boundary Segregation ◽

Grain Boundary Character ◽

Service Conditions ◽

Thermal Stability Of

In nanocrystalline alloys, the anisotropy in grain boundary segregation and its impact on dynamic solute drag plays a key role in the thermal stability of these systems during processing treatments or under service conditions.

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Role of grain boundary segregation in corrosion fatigue process of high strength aluminium alloy

Materials Chemistry and Physics ◽

10.1016/0254-0584(96)80054-x ◽

1996 ◽

Vol 45 (1) ◽

pp. 84-87 ◽

Cited By ~ 5

Author(s):

Ren-Guo Song ◽

Bao-Jin Zhang ◽

Mei-Kuang Tseng

Keyword(s):

Grain Boundary ◽

Aluminium Alloy ◽

Corrosion Fatigue ◽

Boundary Segregation ◽

High Strength ◽

Grain Boundary Segregation ◽

Fatigue Process

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An atom probe tomography study of grain boundary segregation in nanocrystalline Ni-W

MRS Proceedings ◽

10.1557/proc-0903-z03-01 ◽

2005 ◽

Vol 903 ◽

Cited By ~ 2

Author(s):

Andrew Detor ◽

Michael K. Miller ◽

Christopher A. Schuh

Keyword(s):

Grain Boundary ◽

Atom Probe Tomography ◽

Boundary Segregation ◽

Atom Probe ◽

Solute Segregation ◽

Grain Boundary Segregation ◽

Distribution Analysis ◽

Grain Sizes ◽

Composition Fluctuations ◽

20 Nm

AbstractAtom probe tomography is used to observe the solute distribution in electrodeposited nanocrystalline Ni-W alloys with three different grain sizes (3, 10, and 20 nm) and the results are compared with atomistic computer simulations. The presence of grain boundary segregation is confirmed by detailed analysis of composition fluctuations in both experimental and simulated structures, and its extent quantified by a frequency distribution analysis. In contrast to other nanocrystalline alloys, the present Ni-W alloys exhibit only a subtle amount of solute segregation to the intergranular regions. This finding is consistent with quantitative predictions for these alloys based upon a thermodynamic model of grain boundary segregation.

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Grain Boundary Segregation in Titanium Dioxide: Evaluation of Relative Driving Forces for Segregation

MRS Proceedings ◽

10.1557/proc-751-z4.6 ◽

2002 ◽

Vol 751 ◽

Cited By ~ 1

Author(s):

Qinglei Wang ◽

Guoda D. Lian ◽

Elizabeth C. Dickey

Keyword(s):

Titanium Dioxide ◽

Driving Forces ◽

Boundary Segregation ◽

Solute Segregation ◽

Dielectric Behavior ◽

Relative Role ◽

Transmission Electron ◽

Fundamental Phenomenon ◽

Versus Strain

ABSTRACTSolute segregation to grain boundaries is a fundamental phenomenon in polycrystalline metal-oxide electroceramics that has enormous implications for the macroscopic dielectric behavior of the materials. This paper presents a systematic study of solute segregation in a model dielectric, titanium dioxide. We investigate the relative role of the electrostatic versus strain energy driving forces for segregation by studying yttrium-doped specimens. Through analytical transmission electron microscopy studies, we quantitatively determine the segregation behavior of the material. The measured Gibbsian interfacial excesses are compared to thermodynamic predictions.

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