Grain boundary misorientation dependence of β phase precipitation in an Al–Mg alloy

D’Antuono, Daniel Scotto; Gaies, J.; Golumbfskie, William; Taheri, Mitra L.

doi:10.1016/j.scriptamat.2014.01.003

Cited by 84 publications

(32 citation statements)

References 26 publications

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“…In contrast, Kaigorodova et al showed that precipitation existed at GBs with low angle misorientation (5–10°)24. Scotto D’Antuono et al suggested that β precipitation was more prevalent along low-angle GBs than high-angle GBs, conflicting with previous observation of β phase growth only occurring in high angle GBs21. Zhao et al demonstrated that some low angle GBs can have β precipitation while some high angle GBs are immune to β precipitation22, which is in agreement with the Scotto D’Antuono et al 21 , but in contrast to Davemport et al 23.…”

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confidence: 88%

Improve sensitization and corrosion resistance of an Al-Mg alloy by optimization of grain boundaries

Yan

Heckman

Velasco

et al. 2016

Sci Rep

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The sensitization and subsequent intergranular corrosion of Al-5.3 wt.% Mg alloy has been shown to be an important factor in stress corrosion cracking of Al-Mg alloys. Understanding sensitization requires the review of grain boundary character on the precipitation process which can assist in developing and designing alloys with improved corrosion resistance. This study shows that the degree of precipitation in Al-Mg alloy is dependent on grain boundary misorientation angle, adjacent grain boundary planes and grain boundary types. The results show that the misorientation angle is the most important factor influencing precipitation in grain boundaries of the Al-Mg alloy. Low angle grain boundaries (≤15°) have better immunity to precipitation and grain boundary acid attack. High angle grain boundaries (>15°) are vulnerable to grain boundary acid attack. Grain boundaries with adjacent plane orientations near to {100} have potential for immunity to precipitation and grain boundary acid attack. This work shows that low Σ (Σ ≤ 29) coincident site lattice (CSL) grain boundaries have thinner β precipitates. Modified nitric acid mass loss test and polarization test demonstrated that the global corrosion resistance of sputtered Al-Mg alloy is enhanced. This may be attributed to the increased fractions of low Σ (Σ ≤ 29) CSL grain boundaries after sputtering.

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confidence: 88%

Improve sensitization and corrosion resistance of an Al-Mg alloy by optimization of grain boundaries

Yan

Heckman

Velasco

et al. 2016

Sci Rep

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“…The main alloying element is the magnesium with 4-4.9 wt % content. The aim of Mg alloying is, rising up the strength of the alloy with solid solution hardening mechanism [14]. In equilibrium state Mg solubility reduces from 15.35 wt % to 1.7 wt % when the temperature is dropping from eutectic to ambient temperature.…”

Section: Introductionmentioning

confidence: 99%

Scanning Electrochemical Microscopy (SECM) Investigation of 3D Printed Parts Produced by CMT Welding Technology

et al. 2020

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In the field of manufacturing technology an exciting revolution is in progress today. The different methods of the so called additive manufacturing (AM) technologies are under fast developments. Several versions of them are called 3D printing. Less interest has been given to study the corrosion resistance character of the differently made 3D printed metal alloy items. In this work corrosion behaviour of 3D printed AlMg4.5Mn0.7 alloy samples were investigated. Conventional methods like open circuit potential measurements, Tafel plots taking and scanning electrochemical microscopy (SECM) – with pH measuring tungsten micro‐tip and micro‐disc type Pt electrode were used. The metal samples were embedded in epoxy resin. 2D SECM images and line scans were made to see the local changes of oxygen concentration. Flame atomic absorption spectroscopy was used for measuring the metal composition of manufacturing wire and printed sample. The local activity of the surface spots were measured using approach curves recorded in case of ferrocene methanol mediator.

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“…Al-Mg alloys are widely used in transportation industry due to their high strength, good formability and weldability and favorable corrosion resistance [1][2][3][4]. However, addition of more than 3 wt.% Mg can cause magnesium to preferably diffuse to the (sub)grain boundaries and form β-phase Al 3 Mg 2 [5,6], which is more susceptible to the corrosion than the Al-Mg matrix, and sensitization -intergranular corrosion and stress corrosion cracking -may occur at low and moderate temperatures, leading to exfoliation corrosion [7]. The β-phase can form either continuously or discontinuously along the (sub)grain boundaries or near the pre-existing Mn-rich particles.…”

Section: Introductionmentioning

confidence: 99%

Transmission Electron Microscopy Study of Microstructure Evolution of Al-Mg-Sc Alloy after Annealing at 120°

et al. 2018

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The Al-Mg-Sc alloys are used in aerospace and shipbuilding industry due to their good mechanical properties such as corrosion resistance, weldability and possibility for superplastic forming. Addition of Sc with Zr may further lead to enhancement of their performance by precipitation of coherent particles of Al3(Sc,Zr) phase which are known to stabilize the microstructure and hinder the recrystallization. The role of the material processing on the microstructure and mechanical properties evolution was studied by means of transmission electron microscopy, scanning electron microscopy and resistivity measurement. The Al-Mg-Sc-Zr alloy was manufactured by two different manners-conventional casting and twin-roll casting and subjected to deformation by equal-channel angular pressing. The shape and nature of the grains significantly influenced precipitation of β-phase Al3Mg2, which may be detrimental for such kind of materials in the terms of corrosion resistance. The worst properties exhibited the conventionally cast and rolled material with a pancake grain structure where the β-phase particles forms as continuous layer along the (sub)grain boundaries.

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Grain boundary misorientation dependence of β phase precipitation in an Al–Mg alloy

Cited by 84 publications

References 26 publications

Improve sensitization and corrosion resistance of an Al-Mg alloy by optimization of grain boundaries

Improve sensitization and corrosion resistance of an Al-Mg alloy by optimization of grain boundaries

Scanning Electrochemical Microscopy (SECM) Investigation of 3D Printed Parts Produced by CMT Welding Technology

Transmission Electron Microscopy Study of Microstructure Evolution of Al-Mg-Sc Alloy after Annealing at 120°

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