Nanoquasicrystalline Al–Fe–Cr-based alloys. Part II. Mechanical properties

Galano, M.; Audebert, F.; Garcı́a-Escorial, A.; Stone, Ian; Cantor, B.

doi:10.1016/j.actamat.2009.07.009

Cited by 71 publications

(39 citation statements)

References 35 publications

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“…It has been shown that nanosized primary metastable (I-phase) icosahedral particles formed by rapid solidification in the microstructure of transition metal-modified Al alloys result in high strength of prepared samples (above 600 MPa) [1,2]. This has been confirmed by some recent research [3][4][5]. Another approach also developed in the 1990s [6] considered the production of composite materials where stable quasicrystals were mixed with pure Al powder and subsequently consolidated [7,8].…”

Section: Introductionmentioning

confidence: 88%

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Formation of Quasicrystalline Phases and Their Close Approximants in Cast Al-Mn Base Alloys Modified by Transition Metals

Stan-Głowińska

2018

Crystals

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Abstract:The aim of the presented research was to study the influence of Cr, Co, Ni, and Cu additions on the formation of quasicrystalline particles in the 94Al-6Mn base alloy during casting at intermediate cooling rates. Based on the obtained results, Cu and Ni enhance quasicrystalline phase nucleation compared to the unmodified binary composition. In the case of Cu addition, formation of a quasicrystalline phase takes place along whole thickness of the prepared casting, but its fraction and morphology depends on the cooling rates present in different parts of the sample. Based on the previous works on the beneficial effect of Fe addition, a quaternary alloy containing both Fe and Cu was prepared to evaluate the effect of the simultaneous presence of these elements on the microstructure of the obtained castings.

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Section: Introductionmentioning

confidence: 88%

“…Among different approaches, those connected with the developing microstructure containing quasicrystalline phases, or their close approximates, give promising results [1][2][3][4]. The first studies indicating the effectiveness of quasicrystals as a strengthening phase in aluminum alloys were performed in the early 1990s.…”

Section: Introductionmentioning

confidence: 99%

Formation of Quasicrystalline Phases and Their Close Approximants in Cast Al-Mn Base Alloys Modified by Transition Metals

Stan-Głowińska

2018

Crystals

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“…These good mechanical properties decrease with temperature. A combination of solid solution strengthening, precipitation strengthening and grain size refinement would be responsible for the high strength of this alloy (Galano et al, 2009a).…”

Section: Introductionmentioning

confidence: 99%

Aleaciones cuasicristalinas Al93Fe3Cr2Ti2

Natale¹,

Cremaschi²,

Todd³

et al. 2015

REVMETAL

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Aluminium alloy powder having a nominal composition of Al 93 Fe 3 Cr 2 Ti 2 (at%) has been prepared using gas atomisation. The atomised powder present a microstructure of an aluminium matrix reinforced with a spherical quasicrystalline icosahedral phase, in the range of nanometre in size. The powder was consolidated into bars using warm extrusion. The microstructure of the extruded bars retains the quasicrystalline microstructure and the bars present outstanding mechanical properties, i.e. proof stress of 280 MPa at 300 °C. Upon heating the microstructure evolves towards the equilibrium. The thermal evolution was investigated by means of x-ray diffraction, differential scanning calorimeter, scanning electron microscopy and transmission electron microscopy. According to these observations a transformation in two steps is proposed. A first step consists in the decomposition of the supersaturated solid solution of the matrix and the quasicrystals, and a second step in the transformation of the quasicrystals into the equilibrium phases. 93 Fe 3 Cr 2 Ti 2 . Se ha obtenido por atomización por gas polvo de la aleación Al 93 Fe 3 Cr 2 Ti 2 (at%). Este polvo presenta una microestructura de una matriz de aluminio reforzada por precipitados icosaédricos de tamaño nanométrico. El polvo fue consolidado por extrusión en forma de barras cilíndricas. La microestructura de las barras retiene la microestructura cuasicristalina de las partículas de polvo. El material consolidado presenta propiedades mecánicas prometedoras, como un límite elástico de 280 MPA a 300 °C. Con los tratamientos térmicos, la microestructura evoluciona hacia el equilibrio. Esta evolución se estudia por difracción de rayos x, calorimetría diferencial de barrido, microscopías electrónicas de barrido y de transmisión. A la luz de los resultados obtenidos se propone que la transformación de las fases con el tiempo de tratamiento térmico ocurre en dos pasos. Primeramente, tiene lugar la descomposición de la solución solida sobresaturada, tanto en la matriz como en los cuasicristales, y posteriormente los cuasicristales se transforman en las fases de equilibrio del sistema: α RESUMEN: Aleaciones cuasicristalinas Al

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“…This also applies to aluminium alloys strengthened by a quasicrystalline phase. These alloys exhibit high room temperature (RT) strength above 600 MPa [10,11] and, compared to amorphous alloys, do not require expensive rare earth additions. Moreover, bulk forms, prepared by various consolidation techniques of RS feedstock, exhibit very promising properties at elevated temperatures, especially high creep and fatigue resistance [5,12,13].…”

Section: Introductionmentioning

confidence: 99%

Formation of a quasicrystalline phase in Al–Mn base alloys cast at intermediate cooling rates

et al. 2017

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Al-rich 94Al-6Mn and 94Al-4Mn-2Fe alloys were suction-cast to evaluate the feasibility of obtaining bulk quasicrystal-strengthened Al-alloys at intermediate cooling rates alloyed with non-toxic, easily accessible and affordable additions. The influence of different cooling rates on the potential formation of a quasicrystalline phase was examined by means of scanning and transmission electron microscopy, X-ray diffraction and differential scanning calorimetry. Increased cooling rates in the thinnest castings entailed a change in sample phase composition. The highest cooling rates turned out to be insufficient to form an icosahedral quasicrystalline phase (I-phase) in the binary alloy. Instead, an orthorhombic approximant phase occurred (L-phase). The addition of Fe to the 94Al-6Mn binary alloy enhanced the formation of a quasicrystalline phase. At intermediate cooling rates of 10 2 -10 3 K/s, various metastable phases were formed, including decagonal and icosahedral quasicrystals and their approximants. Rods (1 mm in diameter) composed of I-phase particles embedded in Al matrix exhibited a hardness of 1.5 GPa, much higher than the 1.1 GPa of 94Al-6Mn.

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Nanoquasicrystalline Al–Fe–Cr-based alloys. Part II. Mechanical properties

Cited by 71 publications

References 35 publications

Formation of Quasicrystalline Phases and Their Close Approximants in Cast Al-Mn Base Alloys Modified by Transition Metals

Formation of Quasicrystalline Phases and Their Close Approximants in Cast Al-Mn Base Alloys Modified by Transition Metals

Aleaciones cuasicristalinas Al<sub>93</sub>Fe<sub>3</sub>Cr<sub>2</sub>Ti<sub>2</sub>

Formation of a quasicrystalline phase in Al–Mn base alloys cast at intermediate cooling rates

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