Thermal stability of an composite processed by powder metallurgy

Lieblich, Marcela; González-Carrasco, José Luis; Caruana, G.

doi:10.1016/s0966-9795(97)00027-7

Cited by 30 publications

(24 citation statements)

References 13 publications

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“…As can be seen, whereas only very small diffusion reaction phases appear at the interface between matrix and reinforcements in T1, large interphases form during the T4 treatment. These new phases have been identified as Al 3 Ni containing Cu, the layer closer to the Al matrix, and Al 3 Ni 2 , the layer closer to the Ni 3 Al or NiAl reinforcement [2,12,13]. The formation of these diffusion reaction phases occurs with a volume increase compared to that occupied by the original Ni 3 Al or NiAl particles [2,14].…”

Section: Resultsmentioning

confidence: 99%

“…Aluminium matrix reinforced with intermetallic powder particles (AMCIPs) has been recently developed [1][2][3] as a possible answer to the transport industry's need to replace heavy and/or costly Fe-and Ti-base parts with lighter and cheaper materials. Ceramic reinforced Al alloys have been considered suitable candidates for these purposes over the past few decades.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical properties of some PM aluminide and silicide reinforced 2124 aluminium matrix composites

et al. 2002

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Tensile properties of PM 2124 aluminium composites reinforced with Ni 3 Al, NiAl, Cr 3 Si and MoSi 2 intermetallic powder particles have been investigated in tempering conditions T1 and T4. Intermetallics were produced by SHS and composite powders consolidated by extrusion. 2124/MoSi 2 showed the highest thermal stability, and the best mechanical properties even after comparison with those of 2124/SiC composite after processing through the same route.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanical properties of some PM aluminide and silicide reinforced 2124 aluminium matrix composites

et al. 2002

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“…Also, recycling of intermetallic reinforced composites is more straightforward than that of ceramic reinforced materials because it is not necessary to make any separation of the components before melting. On the other hand, powder metallurgy has already proved to be a suitable processing route for AMCIPs because it allows a wide combination of Al alloys and intermetallics by controlling diffusion reactions between them [7][8][9], better than casting routes [2][3][4], where much higher temperatures are involved.…”

Section: Introductionmentioning

confidence: 99%

“…This material presented a sound matrix/reinforcement bonding and good wear properties compared to unreinforced Al [6,11], and was thermally stable up to 300°C. For higher treatment temperatures, deleterious diffusion reaction products appeared [7,12], that hindered the use of age hardening Al alloy matrices such as those of the 2xxx and 6xxx Al series. When this type of Al alloys are required, a different intermetallic reinforcement should be found, that withstand solid solution treatments without catastrophically reacting with Al or any other solute element of the matrix.…”

Section: Introductionmentioning

confidence: 99%

Room and high temperature tensile behaviour of a P/M 2124/MoSi2 composite at different heat treatment conditions

Torres

Lieblich

2006

J Mater Sci

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In the present work, a 2124/15vol%MoSi 2 composite was obtained by powder metallurgy. Its microstructure and mechanical properties were investigated at room and at high temperature (up to 200ºC) in conditions T351, T4 and after heat treatments at 495ºC for up to 100 hours. Up to 150ºC, tensile properties of 2124/MoSi 2 in T351 resulted similar to those of a ceramic reinforced 2124/SiC composite. Yield stress of the 2124/MoSi 2 material, after heating at 495ºC for up to 100 hours, resulted higher than that of the monolith 2124 alloy heated for the same periods. No diffusion reaction phases were formed surrounding the MoSi 2 reinforcing particles during such long exposures to high temperature. Only at 100 hours, large plate-like precipitates that contain Al, Cu, Mg and Si appeared. The high thermal stability of this 2124/MoSi 2 composite and its good mechanical properties at room and at elevated temperature makes MoSi 2 intermetallic a competitor of ceramic reinforcements.

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“…Powder Metallurgical (PM) methods have been mainly employed to produce intermetallic reinforced AMCs in order to avoid the formation of deleterious interphases and because, through PM, the spatial distribution of the particles is normally more homogeneous than that obtained by casting methods (Lieblich et al, 1997). High-energy ball milling has been used to further improve particle distribution throughout the matrix (Lu et al, 1998;Parvin et al, 2008;Corrochano et al, 2009) because fracturing and cold welding of the powder particles occur, causing the rein forcement particles to be well embedded into each aluminum particle.…”

Section: Introductionmentioning

confidence: 99%

Production of AA2124/MoSi<sub>2</sub>/25p composites and effect of heat treatment on their microstructure, hardness and compression properties

Piyadeh¹,

Abdollah-Pour²,

Lieblich³

2014

REVMETAL

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AA2124/25vol%MoSi 2 composites were processed by two powder metallurgy routes: high energy ball milling of the reinforcement and alloy powder (B composite) and wet blending with cyclohexane (W composite), both followed by extrusion to achieve full consolidation. As-extruded and heat treated composite bars were studied microstructurally and mechanically (hardness and compression tests under quasistatic loading). Microstructure and fracture profiles were observed by scanning electron microscopy and the reaction products formed in the matrix were identified by energy-dispersive X-ray spectroscopy and X-ray diffraction analysis. The results show that for both composites, the hardness of the specimens in solution and aged condition was higher than in the as-extruded condition. The hardness of the B composite was higher than that of the W composite whereas the age-hardenability of the B composite was significantly lower than that of the W composite. After heat treatments, small diffusion reaction phases appeared at the interface between matrix and reinforcements. Compressive yield strength and the ultimate strength of both composites improved considerably after the artificial ageing. The composite fracture surfaces exhibited microscopically a ductile appearance that consisted of dimples in the matrix and a fragile fracture of the MoSi 2 particulates. RESUMEN: Producción de materiales compuestos AA2124/MoSi2/25p y efecto del tratamiento térmico sobre su microestructura, dureza y propiedades a compresión. En este trabajo se procesaron materiales compuestos AA2124/25vol% MoSi 2 mediante dos rutas pulvimetalúrgicas: mezcla de refuerzo y matriz mediante molino de bolas de alta energía (compuesto B) y mezcla húmeda con ciclohexano (compuesto W). Ambos polvos compuestos se consolidaron por extrusión. Los materiales recién extruidos y después de tratados térmicamente se estudiaron desde el punto de vista microestructural y mecánico (dureza y compresión bajo carga cuasiestática). Las microestructuras y los perfiles de fractura se observaron por microscopía electrónica de barrido y los productos de reacción formados en la matriz se identificaron por espectroscopía de dispersión de energía de rayos X y por difractometría de rayos X. Los resultados indican que para ambos materiales la dureza es mayor después de los tratamientos térmicos. Por otro lado, la dureza del material compuesto B es mayor que la del W, mientras que la capacidad de endurecer de B es mucho menor que la de W. Después de los tratamientos térmicos aparecen pequeñas cantidades de fases de reacción entre la matriz y el refuerzo. La resistencia a compresión de ambos materiales compuestos mejora considerablemente a consecuencia del envejecimiento artificial. Las superficies de fractura exhiben una apariencia dúctil, con formación de cúpulas en la matriz y fractura frágil de las partículas de MoSi 2 .

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Thermal stability of an composite processed by powder metallurgy

Cited by 30 publications

References 13 publications

Mechanical properties of some PM aluminide and silicide reinforced 2124 aluminium matrix composites

Mechanical properties of some PM aluminide and silicide reinforced 2124 aluminium matrix composites

Room and high temperature tensile behaviour of a P/M 2124/MoSi2 composite at different heat treatment conditions

Production of AA2124/MoSi<sub>2</sub>/25p composites and effect of heat treatment on their microstructure, hardness and compression properties

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