Formation of metastable phases and nanocomposite structures in rapidly solidified Al–Fe alloys

Nayak, S.S.; Chang, Ho Jin; Kim, D.H.; Pabi, S.K.; Murty, B.S.

doi:10.1016/j.msea.2011.04.028

Cited by 29 publications

(14 citation statements)

References 22 publications

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“…(9) Surface films on both phases, (Al) and Al 9 Co 2 , consisted of mixtures of alumina hydrates (Al(OH) 3 and AlOOH) and Co-oxides/oxyhydroxide (Co 3 O 4 /CoO/CoOOH) along with amorphous Co-oxide or Co-oxide dispersed species.…”

Section: Discussionmentioning

confidence: 99%

“…During the last few decades, rapidly solidified (RS) Al-alloys have been attracting significant attention due to improved properties (such as mechanical behavior and corrosion resistance) in relation to conventional Al alloys [1][2][3][4][5][6][7][8][9][10]. Rapid solidification processes (RSP) can produce many metastable phases, such as supersaturated solid solutions, intermediate phases and metallic glasses.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Al-Co Alloys Prepared by Vacuum Arc Melting: Correlating Microstructure Evolution and Aqueous Corrosion Behavior with Co Content

Lekatou

Sfikas

Petsa

et al. 2016

Metals

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Hypereutectic Al-Co alloys of various Co contents (7-20 weight % (wt.%) Co) were prepared by vacuum arc melting, aiming at investigating the influence of the cobalt content on the microstructure and corrosion behavior. Quite uniform and directional microstructures were attained. The obtained microstructures depended on the Co content, ranging from fully eutectic growth (7 wt.% and 10 wt.% Co) to coarse primary Al 9 Co 2 predominance (20 wt.% Co). Co dissolution in Al far exceeded the negligible equilibrium solubility of Co in Al; however, it was hardly uniform. By increasing the cobalt content, the fraction and coarseness of Al 9 Co 2 , the content of Co dissolved in the Al matrix, and the hardness and porosity of the alloy increased. All alloys exhibited similar corrosion behavior in 3.5 wt.% NaCl with high resistance to localized corrosion. Al-7 wt.% Co showed slightly superior corrosion resistance than the other compositions in terms of relatively low corrosion rate, relatively low passivation current density and scarcity of stress corrosion cracking indications. All Al-Co compositions demonstrated substantially higher resistance to localized corrosion than commercially pure Al produced by casting, cold rolling and arc melting. A corrosion mechanism was formulated. Surface films were identified.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Al-Co Alloys Prepared by Vacuum Arc Melting: Correlating Microstructure Evolution and Aqueous Corrosion Behavior with Co Content

Lekatou

Sfikas

Petsa

et al. 2016

Metals

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show abstract

“…The mechanical properties are very interesting as the hardness of Al-2.5%Fe and Al-5%Fe sintered samples reached 1.44 and 1.61 GPa, respectively. These values are much higher than that of the samples prepared by rapid solidification processing (RSP) by Nayak et al [44]. They reported an increase in hardness with the increase of wheel speed, from 0.71 to 0.89 GPa for Al-2.5%Fe and 0.91 to 1.43 GPa for Al-5%Fe, respectively.…”

Section: Mechanical Properties Of the Sintered Samplesmentioning

confidence: 75%

Microstructure and mechanical properties of in-situ Al13Fe4/Al composites prepared by mechanical alloying and spark plasma sintering

Xue

et al. 2012

Materials Science and Engineering: A

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“…13 The Al 13 On the other hand some of the researcher reported that, these two monoclinic structural submicron intermetallics are very close to each other. 12,20 The rapid cooling and solidification have great effect on formation of the intermetallic phase. However, the development of solidification microstructures along the (Twin Roll Casting) TRC process has some particular characteristics.…”

Section: Microstructure Propertiesmentioning

confidence: 99%

“…Some of the researchers focused the metallurgical behavior of Al-Fe powders and alloys. [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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Formation of metastable phases and nanocomposite structures in rapidly solidified Al–Fe alloys

Cited by 29 publications

References 22 publications

Al-Co Alloys Prepared by Vacuum Arc Melting: Correlating Microstructure Evolution and Aqueous Corrosion Behavior with Co Content

Al-Co Alloys Prepared by Vacuum Arc Melting: Correlating Microstructure Evolution and Aqueous Corrosion Behavior with Co Content

Microstructure and mechanical properties of in-situ Al13Fe4/Al composites prepared by mechanical alloying and spark plasma sintering

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

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