Quasicrystals and complex metallic alloys: Trends for potential applications

Barthés-Labrousse, M.-G.; Dubois, Jean‐Marie

doi:10.1080/14786430802023036

Cited by 28 publications

(12 citation statements)

References 39 publications

(39 reference statements)

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“…CP-Aland Al-Co alloys (7,10,15,20 wt.% Co) were prepared by vacuum arc melting. The alloys were composed of Al 9 Co 2 particles uniformly distributed in an Al matrix.…”

Section: Discussionmentioning

confidence: 99%

“…CP-Al and Al-Co alloys (7,10,15,20 wt.% Co) were prepared by vacuum arc melting (VAM). Appropriate mixtures of Al powder (-44 μm, 99.5% purity) and Co powder (-37 μm, 99.5% purity), of 3.8-4.0 g weight, were placed in the cavity of the water-cooled copper base of a VAM furnace.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, the development of a new category of materials, that of Complex Metallic Alloys (CMAs)-Quasi Crystals (QCs) [5] has rekindled the interest in the Al-Co system: CMAs constitute a new class of intermetallic compounds with high structural complexity, giant unit cells containing from tens to more than a thousand atoms and lattice parameters of several nanometers [6]. CMAs have a rising potential as multifunctional materials due to properties, such as low surface energy associated properties (oxidation, corrosion and friction resistance, hydrogen sorption capacity), high hardness, low electrical conductivity and low thermal conductivity [7][8][9][10][11]. However, their low ductility limits their application potentials.…”

Section: Introductionmentioning

confidence: 99%

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Solid Particle Erosion of Aluminum In-Situ Reinforced with a Cobalt Aluminide

Lekatou¹

2017

Mater. Sci. Eng. Adv. Res

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The present effort studies the comparative solid particle erosion behaviour of Al-Co alloys of various compositions in the AlAl 9 Co 2 side of the Al-Co phase diagram. The alloys have been prepared by vacuum arc melting. The main concept behind the selection of the Al-Al 9 Co 2 region of the Al-Co phase diagram was the attainment of a two-phase structure (Al + Al 9 Co 2 ) that could combine the beneficial attributes of Al 9 Co 2 , as a Complex Metallic Alloy in-situ reinforcement, with the ductility/toughness of Al, as a matrix to the brittle intermetallic.Hypereutectic Al-Co alloys of various Co contents (7, 10, 15 and 20 wt.% Co), as well as monolithic commercially pure Al, were prepared by vacuum arc melting. The alloys were subjected to solid particle erosion testing at two impact angles (60° and 90°). The test results were interpreted based on weight change measurements and scanning electronic microscopy. It was revealed that the governing mechanisms change as the impact angle and the reinforcement volume fraction change. It was shown that factors affecting the brittle/ductile character of the material, such as Al 9 Co 2 volume fraction, Al 9 Co 2 coarseness, Co dissolved in Al, play a primary role on the erosion response of the alloys. The Al-Co alloys showed higher wear rates than Al. The wear rate increased with Co and, consequently, Al 9 Co 2 increasing. The surface characteristics and degradation mechanisms are being discussed.

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“…CP-Aland Al-Co alloys (7,10,15,20 wt.% Co) were prepared by vacuum arc melting. The alloys were composed of Al 9 Co 2 particles uniformly distributed in an Al matrix.…”

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Solid Particle Erosion of Aluminum In-Situ Reinforced with a Cobalt Aluminide

Lekatou¹

2017

Mater. Sci. Eng. Adv. Res

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“…Quasicrystalline Al-Fe-based alloys are a group of Complex Metallic Alloys (CMAs) designated as a new class of composite material that is characterized by a complex crystallographic structure [1,2]. Formation of quasicrystalline i-phase with long range orientation order and no translational symmetry in rapidly-cooled Al-alloys was originally discovered by Shehtman et al in 1984 [3] and, then, promoted by additions of Mn, Fe, Cr, V, Ti, Zr, Nb and Ta [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…Formation of quasicrystalline i-phase with long range orientation order and no translational symmetry in rapidly-cooled Al-alloys was originally discovered by Shehtman et al in 1984 [3] and, then, promoted by additions of Mn, Fe, Cr, V, Ti, Zr, Nb and Ta [4][5][6][7]. Quasicrystalline Al-Fe-based CMAs are of growing interest owing to their interesting and sometimes unexpected properties [2,[4][5][6]8]. In particular, nanoquasicrystalline Al-Fe-Cr-based alloys show high elevated-temperature strength ensured by increased structural stability.…”

Section: Introductionmentioning

confidence: 99%

Structural performance of nanoquasicrystalline composites based on Al-Fe-Cr-alloy: Synthesis and key characteristics

Byakova

Yurkova

2017

2017 IEEE 7th International Conference Nanomaterials: Application &Amp; Properties (NAP)

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The present study is primary addressed to structural performance of nanoquasicrystalline composites based on Al-Fe-Cr alloy and, particularly, their thermal stability and mechanical behaviour in response to heat treatment. Several kinds of semi-products and bulk-shaped composites have been produced using rapid solidification by melt spinning, powder atomization, hot extrusion, and cold-spraying. All kinds of asreceived products comprised nano-sized quasicrystalline particles embedded in Al matrix although their fraction volume and the other structural parameters of composites were found to be rather different and dependent on synthesized strategy. Evolution of structure in response to heat treatment of the each kind of product and synthesized composite have been studied by means of precise method of differential scanning calorimetry, Xray analysis, and electron microscopy. Mechanical parameters of as received and heat treated composites have been examined by using indentation technique and discussed by considering classical strengthening mechanisms. As to structural stability of ternary Al-Fe-Cr alloy, cold-spraying technique shows essential advantage in remaining quasicrystalline phase and, hence, mechanical properties compared to that provided by currently employed hot extrusion.

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Synthesis and stability of quasicrystalline phase in Al-Cu-Fe-Si mechanically alloyed powders

2021

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The effect of Si addition on a quasicrystalline phase formation in Al-Cu-Fe-Si alloys prepared by mechanical alloying has been investigated using X-ray diffraction and scanning and transmission electron microscopy. Two compositions containing 10 at.% of Si were selected to verify the influence of the e/a ratio on a sequence of phase formation during milling: Al58.5Cu18Fe13.5Si10 (e/a = 1.98) and Al53.5Cu19.5Fe17Si10 (e/a = 1.75). A quasicrystalline icosahedral phase (i-phase) was found in both alloys after 10 h of milling in the form of nano-quasicrystallites with the size of 10–20 nm. Addition of Si stabilized the quasicrystalline phase being dominant after prolonged milling time, contrary to the reference ternary Al65Cu20Fe15 powder, which apart of the quasicrystalline phase contained the cubic β-Al(Cu, Fe) phase. Thermal stability of the quasicrystalline phase in the powders milled for 10 h was examined after annealing at 800 °C for 4 h. The i-phase was preserved partially in Al53.5Cu19.5Fe17Si10 and reference Al65Cu20Fe15 powders (both with a ratio e/a = 1.75), which coexisted with β-Al(Cu, Fe) and Al13Fe4 phase or α-Al55Si7Cu25.5Fe12 and Al2Fe3Si3 phases in Al65Cu20Fe15 and Al53.5Cu19.5Fe17Si10, respectively. For the Al58.5Cu18Fe13.5Si10 powders (e/a = 1.98), the annealing led to complete transformation of the i-phase to the cubic α-Al55Si7Cu25.5Fe12.5 approximant, forming crystallites with a size of 100–300 nm. Graphical abstract

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Quasicrystals and complex metallic alloys: Trends for potential applications

Cited by 28 publications

References 39 publications

Solid Particle Erosion of Aluminum In-Situ Reinforced with a Cobalt Aluminide

Solid Particle Erosion of Aluminum In-Situ Reinforced with a Cobalt Aluminide

Structural performance of nanoquasicrystalline composites based on Al-Fe-Cr-alloy: Synthesis and key characteristics

Synthesis and stability of quasicrystalline phase in Al-Cu-Fe-Si mechanically alloyed powders

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