Microstructural development during thermomechanical processing of particulate metal-matrix composites

Humphreys, F.J.; Miller, W. S.; Djazeb, M. R.

doi:10.1179/026708390790189975

Cited by 38 publications

(33 citation statements)

References 12 publications

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“…The grain size in the composite was also inhomogeneous, increasing in size with increasing distance from the particle/matrix interface. Similar observations have also been reported by Humphries et al [23] The finer grain structure at the particle/matrix interface can be attributed to dynamic recrystallization of new grains at the particle surface during hot extrusion. [24] It is interesting to note that the size and morphology of matrix bands and individual grains appear to be dictated by the rigid SiC particles that act as obstacles for matrix flow.…”

Section: A Microstructure Characterizationsupporting

confidence: 75%

Effect of reinforcement-particle-orientation anisotropy on the tensile and fatigue behavior of metal-matrix composites

Ganesh

Chawla

2004

Metall Mater Trans A

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The effect of extrusion-induced particle-orientation anisotropy on the mechanical behavior of metal-matrix composites (MMCs) was examined. In this study, we have shown that this anisotropy has a significant influence on the tensile and fatigue behavior SiC particle-reinforced Al alloy composites. The preferred orientation of SiC particles was observed parallel to the extrusion axis, with the extent of orientation being highest for the lowest-volume-fraction composites. The composites exhibited higher Young's modulus and tensile strength along the longitudinal direction (parallel to the extrusion axis) than in the transverse direction. The extent of anisotropic behavior increased with increasing volume fraction, because of the increasing influence of the SiC reinforcement on the Young's modulus and tensile properties. The preferred orientation also resulted in anisotropy in the fatigue behavior of the composite material. The trends mirrored those observed in tension, with higher overall fatigue strengths for both orientations and a higher anisotropy with increasing volume fraction of particles. The influence of particle-orientation anisotropy and the resulting tensile and fatigue damage mechanisms is discussed.

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Section: A Microstructure Characterizationsupporting

confidence: 75%

Effect of reinforcement-particle-orientation anisotropy on the tensile and fatigue behavior of metal-matrix composites

Ganesh

Chawla

2004

Metall Mater Trans A

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“…Similar to unreinforced monolithic alloy, the conventional hot working processes such as rolling, forging, and extrusion can be used to produce the composites products. However, during the processing of the composites, the matrix flow behavior will be significantly different from that of the unreinforced monolithic alloy because of the presence of hard ceramic reinforcements, which strongly affect the microstructure and mechanical properties of the composites [3,4]. Therefore, it is very important to understand the microstructural evolution and to predict the best hot working condition for the composites with ceramic reinforcements.…”

Section: Introductionmentioning

confidence: 98%

Deformation map for hot working of AA2024 composites reinforced with SiC particle

Yoo

1999

Metals and Materials

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The dynamic deformation behavior of Al 2024 composites reinforced with 1 and 8 ~m SiCp (15 vol.%) has been investigated in the temperature range of 370 to 500~ and strain rate range of 0.1 to 3.0/sec by torsion testing. Processing maps showing the variation of the efficiency of power dissipation expressed by [2m/(m+l)], where m is the strain rate sensitivity, with temperature and strain rate have been described for the composites. Also, the domain of dynamic recrystallization (DRX) and peak efficiency of the composites were analyzed to suggest an optimum hot working condition for DRX. The SiCp/A12024 composite with 8 Bm SiCp showed 40% efficiency at the DRX domain (370-460~ 0. l~0.5/sec). The optimum temperature and strain rate condition for the DRX of the composites is 430-450~ and 0.5/sec. The characteristics of these results were discussed with the help of microstructural observation during hot deformation.Key words 9 dynamic recrystallization (DRX), effciency of power dissipation, swain rate sensitivity, deformation map

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“…Several mechanical processes including compressing, rolling, extrusion, forging, equal channel angular pressing (ECAP) and accumulative roll bonding (ARB) have been applied to as-cast AMMCs and it has been shown that they can improve the mechanical properties of the AMMCs. The observed improvement in ductility and strength is attributed to associated (a) decrease in porosity content, (b) better interfacial bonding between particle and matrix, (c) separation of agglomerated particles, and (d) refinement of the matrix structure [5,[29][30][31][32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of rolled A356 based composites reinforced by Cu-coated bimodal ceramic particles

et al. 2015

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ab s t r a c tThree kinds of A356 based composites reinforced with 3 wt.% Al2O3 (average particle size: 170 lm), 3 wt.% SiC (average particle size: 15 lm), and 3 wt.% of mixed Al2O3-SiC powders (a novel composite with equal weights of reinforcement) were fabricated in this study via a two-step approach. This first process step was semi-solid stir casting, which was followed by rolling as the second process step. Electroless deposition of a copper coating onto the reinforcement was used to improve the wettability of the ceramic particles by the molten A356 alloy. From microstructural characterization, it was found that coarse alumina particles were most effective as obstacles for grain growth during solidification. The rolling process broke the otherwise present fine silicon platelets, which were mostly present around the Al2O3 particles. The rolling process was also found to cause fracture of silicon particles, improve the distribution of fine SiC particles, and eliminate porosity remaining after the first casting process step. Examination of the mechanical properties of the obtained composites revealed that samples which contained a bimodal ceramic reinforecment of fine SiC and coarse Al2O3 particles had the highest

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Microstructural development during thermomechanical processing of particulate metal-matrix composites

Cited by 38 publications

References 12 publications

Effect of reinforcement-particle-orientation anisotropy on the tensile and fatigue behavior of metal-matrix composites

Effect of reinforcement-particle-orientation anisotropy on the tensile and fatigue behavior of metal-matrix composites

Deformation map for hot working of AA2024 composites reinforced with SiC particle

Mechanical properties of rolled A356 based composites reinforced by Cu-coated bimodal ceramic particles

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