The influence of processing variables on the structure and mechanical properties of nano-quasicrystalline reinforced aluminium alloys

Todd, Iain; Chlup, Zdeněk; O’Dwyer, J.; Lieblich, Marcela; Garcı́a-Escorial, A.

doi:10.1016/j.msea.2003.10.209

Cited by 26 publications

(37 citation statements)

References 6 publications

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“…4) show the copious presence of near spherical precipitates into the Al matrix. As it was shown in previous work (Todd et al, 2004), x-ray diffraction patterns of the powder showed mainly signal of the α-Al phase together with peaks indexed as an icosahedral phase, i-phase, by using the indexation scheme for icosahedral quasiperiodic crystals (Bancel et al, 1985). In the 25-50 and 50-100 μm powder particle size ranges, some smaller peaks corresponding to the intermetallic Al 23 Ti 9 were also identified.…”

Section: Resultssupporting

confidence: 75%

“…As has been seen above, the QC phase present in the alloy studied in this work is quite stable, and thus, it would contribute to the high mechanical properties of this alloy at high temperatures (Chlup et al, 2003;Galano et al, 2009a;Todd et al, 2004). Effectively, Fe and Cr are quasicrystal formers in Al base alloys, and Ti produces a significant refinement of the icosahedral particle size as well as an increase of the stability (Galano et al, 2004).…”

Section: Resultsmentioning

confidence: 52%

“…In the 25-50 and 50-100 μm powder particle size ranges, some smaller peaks corresponding to the intermetallic Al 23 Ti 9 were also identified. The DSC traces revealed a large exothermic peak around 500 °C (Todd et al, 2004), which was attributed to the transformation of the i-phase. Figure 5 collects the XRD patterns of the bars processed with the −25 μm powder particle size fraction, in the as-extruded and the heat treated states, in the most representative range of 2θ between 35° and 50°.…”

Section: Resultsmentioning

confidence: 99%

“…After several trials at different temperatures and extrusion ratios (Todd et al, 2004), the extrusions were carried out at 400 °C, extrusion ratio 10 to 1 and extrusion ram velocity 0.3 mm s −1 . Prior to the extrusion, the encapsulated powder batches were submitted to heating at the extrusion temperature for 15 minutes.…”

Section: Experimental Techniquesmentioning

confidence: 99%

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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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Section: Resultssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 52%

Section: Resultsmentioning

confidence: 99%

Section: Experimental Techniquesmentioning

confidence: 99%

See 2 more Smart Citations

Aleaciones cuasicristalinas Al93Fe3Cr2Ti2

Natale¹,

Cremaschi²,

Todd³

et al. 2015

REVMETAL

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“…We assess to what extent the ''conventional'' RS (10 3 to 10 5 K/s) microstructure of this alloy is compromised by the slower average cooling rate in spray forming (10 1 to 10 3 K/s), and whether the resultant mechanical properties-available in bulkoffer encouragement for the spray forming of this class of alloy. Al-3Fe-2Cr-2Ti provides a useful benchmark alloy since it has been produced elsewhere by suction casting, [6] RS of powders followed by consolidation, [7][8][9] and MA of powders followed by consolidation. [10][11][12] …”

Section: Introductionmentioning

confidence: 99%

Spray Forming of Bulk Ultrafine-Grained Al-Fe-Cr-Ti

Banjongprasert

Hogg

Liotti

et al. 2010

Metall Mater Trans A

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An Al-2.7Fe-1.9Cr-1.8Ti alloy has been spray formed in bulk and the microstructure and properties compared with those of similar alloys produced by casting, powder aomization (PA), and mechanical alloying (MA) routes. In PA and MA routes, a nanoscale metastable icosahedral phase is usually formed and is known to confer high tensile strength. Unlike previous studies of the spray forming of similar Al-based metastable phase containing alloys that were restricted to small billets with high porosity, standard spray forming conditions were used here to produce a~98 pct dense 19-kg billet that was hot isostatically pressed (''HIPed''), forged, and/or extruded. The microstructure has been investigated at all stages of processing using scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and synchrotron X-ray diffraction (XRD) at the Diamond Light Source. Consistent with the relatively low cooling rate in spray forming under standard conditions, the microstructure showed no compelling evidence for the formation of metastable icosahedral phases. Nonetheless, after downstream processing, the spray-formed mechanical properties as a function of temperature were very similar to both PA rapid solidification (RS) materials and those made by MA. These aspects have been rationalized in terms of the typical phases, defects, and residual strains produced in each process route.

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Rapidly Solidified High-Temperature Aluminum Alloys. II. Mechanical Properties

Krainikov

Neikov

2013

Powder Metall Met Ceram

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The influence of processing variables on the structure and mechanical properties of nano-quasicrystalline reinforced aluminium alloys

Abstract: El artículo seleccionado no se encuentra disponible por ahora a texto completo por no haber sido facilitado todavía por el investigador a cargo del archivo del mismo.

Cited by 26 publications

References 6 publications

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

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

Spray Forming of Bulk Ultrafine-Grained Al-Fe-Cr-Ti

Rapidly Solidified High-Temperature Aluminum Alloys. II. Mechanical Properties

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