The microstructure of rapidly solidified AlFe alloys subjected to laser surface treatment

Gremaud, M.; Carrard, Michel; Kurz, W.

doi:10.1016/0956-7151(90)90271-h

Cited by 159 publications

(73 citation statements)

References 25 publications

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“…The formation of these phases is important because they determine the roughness, hardness and corrosion behavior of the treated layer. Other authors have also made this type of analysis, among them, Bertelli et al [12], Pariona et al [8], and Gremaud et al [16]. Figure 3 shows the current density behavior, after a linear polarization ± 10 mV around of the corrosion potential of Al-2.0 wt% Fe alloys, for LSR-treated and untreated samples, where the red line represents the results for the treated sample, while, the dark color curve is to the substrate without treatment.…”

Section: Low-angle X-ray Diffraction (Laxrd) Analysismentioning

confidence: 99%

The Alumina Film Nanomorphology Formed to Improve the Corrosion Resistance of Al-2.0 wt% Fe Alloy as Result of the Laser Surface Melting Technique Applied

Pariona¹,

Micene²

2017

ACES

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The laser surface remelting (LSR) treatment was performed to Al-2.0 wt% Fe alloy with a 2 kW Yb-fiber laser (IPG YLR-2000S). The substrate and laser-treated material characterization were executed using different techniques. Among them, the microstructure was analyzed by optical microscope, SEM, low-angle X-ray diffraction (LAXRD) and the corrosion test was made in aerated solution of 0.1 M H 2 SO 4 at a temperature of 25˚C ± 0.5˚C. As result was shown, the micrograph of LSR-treated material displaying can be a fine cellular structure and the existence of certain nanoporosities and a similar to a nano-dendritic growth was observed too. The characteristic of melted zone was constituted of metastable phases according to the result of x-rays and the behavior corrosion as a result of the LSR-treated sample, which it was shown to be more resistant to corrosion than the untreated sample. A comparative study was carried out of the cyclic polarization of the laser-treated and untreated samples, demonstrating that the reduction and oxidation reverse peaks were not observed and being the cyclic polarization behavior was of irreversible character in both samples, however, the LSR-treated sample propitious the passivity on the surface also reduced the corrosion phenomena. Wherefore, this type of laser-treated alloy can be applied in the aerospace, aeronautic and automobilist industries.

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Section: Low-angle X-ray Diffraction (Laxrd) Analysismentioning

confidence: 99%

The Alumina Film Nanomorphology Formed to Improve the Corrosion Resistance of Al-2.0 wt% Fe Alloy as Result of the Laser Surface Melting Technique Applied

Pariona¹,

Micene²

2017

ACES

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“…This structure probably continues to grow in spite of the sudden increase in the solidification velocity over the surface, i.e., the equilibrium Fe aluminide is not displaced with increasing solidification velocity by a metastable aluminide. 10,14,15 Previous researchers reported that the Si content is lower than 0.15 % of mass fractions of Si, which is the limiting Si content permitting to avoid AlFeSi to be the dominant intermetallic phase. 16 The material used in the experiment (AA8079) has the Si ratio of 0.12 and no AlFeSi intermetallic was observed in the structure.…”

Section: Microstructure Propertiesmentioning

confidence: 99%

“…[10][11][12][13] On the other hand some of the researchers focused the rapid cooling rate and severe deformation effects on the different Al-Fe alloys. [14][15][16] M. Aghaie-Khafri and R. Mahmudi 17 have investigated the plastic instability and necking behavior of AA8079 aluminum alloy sheet in temper-annealed and fully annealed conditions.…”

Section: Introductionmentioning

confidence: 99%

Analysis of twin-roll casting AA8079 alloy 6.35-μm foil rolling process

Can¹,

Arıkan²,

Çinar³

2016

Mater. Tehnol.

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In this work the rolling process and properties of a 6.35-μm twin-roll casting AA8079 aluminum alloy foil was analyzed. First, the 8-mm-thick sheets were produced with a twin-roll casting technology. This product was annealed and cold rolled to a 6.35-μm foil with suitable processing conditions. The mechanical tests and microhardness measurement was applied to specimens derived from all the foil-rolling process stages. On the other hand, the specimens' surface roughness and the surface structure are visualized with an atomic force microscope and an SEM. The microstructural investigation is realized with an optical microscope and XRD. The von-Misses total effective strain was calculated by determining the incremental work for all of the cold-rolling cycle. The alloy showed very low ductility in the tensile tests because of the second-phase metastable intermetallic particles such as Al3Fe. The maximum elongation at the breaking value was measured for 256-μm-foil as 4.5 %. On the other hand, the alloy did not show any significant strain hardening after the cold rolling during the plastic-deformation stages. Keywords: aluminum foil, cold rolling, twin roll casting V delu je bil analiziran postopek valjanja in latnosti 6,35 folije iz AA8079 aluminijeve zlitine, ulite med dvema valjema. Najprej je bil izdelan 8 mm debel trak po postopku ulivanja med dvema valjema. Trak je bil primerno`arjen in hladno zvaljan v 6.35 μm folijo. Iz vseh stopenj procesa valjanja so bili vzeti vzorci na katerih so bile dolo~ene mehanske lastnosti in izmerjena mikro trdota. Poleg tega je bila hrapavost povr{ine in struktura povr{ine vizualizirana z mikroskopom na atomsko silo (AFM) in iz SEM. Preiskava mikrostrukture je bila izvr{ena s svetlobnim mikroskopom in z rentgensko difrakcijo (XRD). Za dolo~anje stopnjujo~ega dela, med celotnim ciklom hladnega valjanja, je bila izra~unana celotna von-Misses efektivna napetost. Zlitina je pokazala zelo nizko duktilnost pri nateznih preizkusih zaradi vsebnosti delcev sekundarne metastabilne intermetalne faze Al3Fe. Maksimalni raztezek pri poru{itvi je bil pri 256 μm debeli foliji 4.5 %. Po drugi plati pa zlitina ni kazala nobenega ob~utnega napetostnega utrjevanja med posameznimi fazami plasti~ne deformacije. Klju~ne besede: aluminijeva folija, hladno valjanje, ulivanje med dvema valjema

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“…Most rapidly solidified Al-Fe alloys exhibited cellular growth of the solidifying fronts. [1][2][3][4][5] Microstructures of splat-cooled binary Al-Fe alloys exhibited two features. 1 The first structure was designated as 'zone A', which referred to a cellular or dendritic-like structure with an arm spacing of ~300 angstrom in colonies of ~1 mm in diameter.…”

Section: Introductionmentioning

confidence: 99%

Untitled

Tongsri¹,

Dashwood²,

Mcshane³

2004

ScienceAsia

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Gas-atomised powders of Al-Fe-(V, Si) alloys exhibited microstructures consisting of cells and/or some forms of icosahedral phase. The forms of icosahedral phase include irregular shaped aggregates of ultrafine spherical micro-quasicrystalline (MI) particles in α−aluminium phase matrix, ultrafine MI particles in intercellular regions, and globular clusters of randomly oriented MI particles (in medium to coarse size AlFe-V alloy powders) or globular particles of single icosahedral phase (in medium to coarse size Al-Fe-V-Si alloy powders). It has been proposed that solidification behavior of the Al-Fe-(V, Si) alloy powders would be attributed to a competition between growth of α−aluminium phase fronts and freely nucleated icosahedral particles. Interactions between the solidification fronts and dispersed particles, influenced by solidification rates, would control microstructural morphology.

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The microstructure of rapidly solidified AlFe alloys subjected to laser surface treatment

Cited by 159 publications

References 25 publications

The Alumina Film Nanomorphology Formed to Improve the Corrosion Resistance of Al-2.0 wt% Fe Alloy as Result of the Laser Surface Melting Technique Applied

The Alumina Film Nanomorphology Formed to Improve the Corrosion Resistance of Al-2.0 wt% Fe Alloy as Result of the Laser Surface Melting Technique Applied

Analysis of twin-roll casting AA8079 alloy 6.35-μm foil rolling process

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