Thermal evolution of nanoquasicrystalline Al93Fe3Cr2Ti2 alloy

Cremaschi, V.; Natale, E.; Lieblich, Marcela

doi:10.1016/j.jallcom.2006.08.211

Cited by 9 publications

(2 citation statements)

References 5 publications

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“…The presence of the icosahedral i-phase in the Al 93 Fe 3 Cr 2 Ti 2 as-extruded bar was confirmed by TEM (García Escorial et al, 2007). Selected area diffraction patterns revealed the two, three and five fold reflection spots as can be seen in Fig.…”

Section: Resultsmentioning

confidence: 60%

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: Resultsmentioning

confidence: 60%

Aleaciones cuasicristalinas Al93Fe3Cr2Ti2

Natale¹,

Cremaschi²,

Todd³

et al. 2015

REVMETAL

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“…Nanoquasicrystalline Al 93 Fe 3 Cr 2 Ti 2 powders have been produced by high-pressure gas atomization, and then warm extrusion process is used to consolidate the powders in form of bars [1][2][3]. Material-processing conditions of hotforming processes of the alloy, for example, extrusion and forming have been investigated.…”

Section: Introductionmentioning

confidence: 99%

On the constitutive modeling of a powder metallurgy nanoquasicrystalline Al93Fe3Cr2Ti2 alloy at elevated temperatures

Shokry

2019

J Braz. Soc. Mech. Sci. Eng.

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The flow behavior of nanoquasicrystalline Al 93 Fe 3 Cr 2 Ti 2 alloy at different strain rates and elevated temperatures was represented by the Johnson-Cook model, a modified Johnson-Cook model, a newly modified Johnson-Cook model, and a modified Zerilli-Armstrong model. A comparative study on the capability of the four models to accurately predict the flow stress of the alloy at hot deformations is made using standard statistical parameters correlation coefficient (R) and average absolute relative error (AARE). The results show that the newly modified Johnson-Cook model provides predicted stresses that agree very well with the experimental stresses at the tested domain of strain rates and temperatures, with R = 0.979 and AARE = 7.78%. The modified Zerilli-Armstrong model might predict the flow stress of the alloy but at some of the tested domain of strain rates and temperatures, with R = 0.951 and AARE = 9.13%. The Johnson-Cook model and the modified Johnson-Cook model are found to be inadequate to predict the flow stress of the alloy with R of 0.924 and 0.935 and AARE of 12.72% and 10.73%, respectively. Keywords Constitutive modeling • Nanoquasicrystalline Al 93 Fe 3 Cr 2 Ti 2 alloy • Flow stress • Elevated temperatures

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Rapidly solidified high-temperature aluminum alloys. I. Structure

Krainikov

Neikov

2012

Powder Metall Met Ceram

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Thermal evolution of nanoquasicrystalline Al93Fe3Cr2Ti2 alloy

Cited by 9 publications

References 5 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>

On the constitutive modeling of a powder metallurgy nanoquasicrystalline Al93Fe3Cr2Ti2 alloy at elevated temperatures

Rapidly solidified high-temperature aluminum alloys. I. Structure

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