Effect of Heat Treatment on Solute Concentration at Grain Boundaries in 7075 Aluminum Alloy

Joshi, A.; Shastry, C. R.; Levy, Milton

doi:10.1007/bf02643489

Cited by 45 publications

(12 citation statements)

References 15 publications

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“…This is because of the use of nitrogen assisting gas during the laser-melting process. Consequently, the formation of AlN is due to the reaction of liquid aluminum with nitrogen (N -3 ), similar to the observation reported in the previous study (Ref 12). It is evident from the top view of the laser-melted surface that the surface roughness increases significantly.…”

Section: Resultssupporting

confidence: 82%

Corrosion Properties and Morphology of Laser Melted Aluminum Alloy 8022 Surface

Yilbaş

Khaled

Karataş

2009

J. of Materi Eng and Perform

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Laser surface melting of aluminum alloy 8022 is considered and electrochemical studies of the laser-melted and as-received alloy surface are carried out. The surface morphology and metallurgical changes in the laser-melted region are examined using optical microscopy, electron scanning microscopy (SEM), and atomic force microscopy (AFM). Elemental changes in the specimens after the laser-melting process are examined using energy dispersive spectroscopy (EDS), and x-ray diffraction (XRD) is used for assessment of the compound formed after the laser-treatment process. Nitrogen is used as an assisting gas during the laser-melting process to prevent high-temperature oxidation reactions. It is found that the laser-melted surfaces is free from cracks and deep cavities. The oxygen diffusion in the surface region of the melt layer forms Al 2 O 3 compound in the surface vicinity. The corrosion current increases significantly for the lasermelted specimens due to the irregular surface structure. AC impedance results showed a decrease in pores resistant and an increase in pores capacitance. In addition, the surface morphology resulting from the laser melting gives rise to pitting sites at the surface.

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Section: Resultssupporting

confidence: 82%

Corrosion Properties and Morphology of Laser Melted Aluminum Alloy 8022 Surface

Yilbaş

Khaled

Karataş

2009

J. of Materi Eng and Perform

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“…Other factors that need to be considered in regard to grainboundary precipitate composition are differences in equilibrium and non-equilibrium segregation during quenching at different rates [39], whether PFZs formed during the early stages of ageing are the result of vacancy depletion or solute depletion [40], and the bulk Zn:Mg:Cu ratios. The higher bulk copper content (and maybe also the higher Zn:Mg ratio) for the AA7075 alloy probably results in higher copper contents of grain-boundary precipitates compared with the AA7079 alloy regardless of quench-rate, since near-surface and mid-thickness material for the AA7075 plate had similar SCC resistance.…”

Section: Effect Of Quench-rate and Ageing On Grain Boundary Microchemmentioning

confidence: 99%

Some effects of alloy composition on stress corrosion cracking in Al–Zn–Mg–Cu alloys

Knight

Pohl

Holroyd³

et al. 2015

Corrosion Science

134

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“…Various studies on Al-Mg-Zn alloys [14,15,16] have indicated that alloying elements (and in particular Mg) are segregated on the grain boundary. Tuck [17] proposed that Mg hydride forms at grain boundaries and is responsible for material embrittlement.…”

Section: Introductionmentioning

confidence: 99%