High-temperature strength and damage evolution in short fiber reinforced aluminum alloys studied by miniature creep testing and synchrotron microtomography

Kurumlu, D.; Payton, E.J.; Young, Marcus L.; Schöbel, M.; Requena, Guillermo; Eggeler, Gunther

doi:10.1016/j.actamat.2011.09.022

Cited by 26 publications

(18 citation statements)

References 28 publications

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“…Fibre length and orientation angle were found to be two key microstructural parameters of pore formation that determined the value of shear stress at fibre ends. Our results indicated that the pore-forming process should be studied by considering fibre orientation, rather than using the same direction between load and fibre orientation as adopted in some previous studies 17 18 19 20 .…”

Section: Resultsmentioning

confidence: 71%

“…By determining the value of shear stress at the fibre ends, we found that the fibre length and orientation angle could affect the pore formation. This view deviated from the damage micro-mechanisms of fibre-reinforced composites in some previous studies 17 18 19 20 , which considered that pore formation is caused by excess tensile stress in the form of fibre breakage.…”

Section: Discussionmentioning

confidence: 66%

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Real internal microstructure based key mechanism analysis on the micro-damage process of short fibre-reinforced composites

Fang

et al. 2016

Sci Rep

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In this work, the underlying micro-damage mechanisms of randomly oriented short fibre-reinforced composites were revealed based on real internal microstructural characteristics obtained by high-resolution (0.7 μm/pixel) synchrotron radiation X-ray computed tomography (SR-CT). The special ‘pore dominant micro-damage processes’ were directly observed through SR-CT three-dimensional reconstructed images, which were different from the well-known ‘fibre breakage dominant failure mode’. The mechanisms of pore formation and pore evolution were further investigated on the basis of the microstructural parameters extracted from the SR-CT results. On one hand, the pore formation mechanism caused by shear stress concentration was proposed by combining the shear-lag model with the microstructural parameters obtained from the experiment, including the fibre length and orientation angle. On the other hand, the ‘fibre-end aggregation-induced pore connection’ mode of crack initiation was proposed through a composites model, which considered the parameters of real internal microstructure, including the critical value of the distance between neighbouring fibre ends and the number of neighbouring fibre ends. The study indicated that the shear stress concentration was significant in the region with a large number of neighbouring fibre ends, thus causing pore connection and crack initiation.

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Section: Resultsmentioning

confidence: 71%

Section: Discussionmentioning

confidence: 66%

Real internal microstructure based key mechanism analysis on the micro-damage process of short fibre-reinforced composites

Fang

et al. 2016

Sci Rep

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“…Furthermore, composites of graphite/aluminium, graphite/copper and graphite/magnesium exhibit higher thermal conductivity due to the significant contribution from the metallic matrix. A metal matrix composite retains the desirable properties of both the matrix and the reinforcement by combining the strength of its reinforcement with the ductility of its matrix [10]. The reinforcing constituent may be a particle, platelet, short fibre or continuous fibre and may range from sub-micrometre to millimetre in size.…”

Section: Types Of Metal Matrix Composites and Their Methods Of Producmentioning

confidence: 99%

Novel Applications of Aluminium Metal Matrix Composites

Nturanabo¹,

Masu²,

Kirabira³

2020

Aluminium Alloys and Composites

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Advanced materials have offered the materials designer a wide range of options in the specification and selection of materials for various applications. Material properties are continually being improved to meet safety and operational standards in line with prevailing technological developments. Modern technological requirements, together with the consumers' demands for systems and machines that are more energy efficient, stronger, lightweight , cost-effective, etc., dictate that the search for new and advanced materials will remain a subject of interest all the time. The difficulty in designing materials for such stringent specifications cannot be overstated, owing to the conflicting nature of these specifications. Aluminium metal matrix composites (AlMMCs) are a class of materials that have proven successful in meeting most of the rigorous specifications in applications where lightweight , high stiffness and moderate strength are the requisite properties. With a variety of reinforcement materials and flexibility in their primary processing, AlMMCs offer great potential for the development of composites with the desired properties for certain applications. In this review, the development, utilisation and future potential of AlMMCs in various industrial and commercial applications is discussed, together with the existing challenges hindering their full market penetration.

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“…Recently, X-ray computed tomography has been widely applied to material science and engineering [9][10][11] and some researchers began to use this technology to analyze the powder-binder separation [12,13], because of its obvious advantages, including 3D and the non-destructive characterization of the spatial structure. In the previous studies, powder-binder separation was analyzed by using gray value distribution in the CT reconstructed data [14,15].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Powder Binder Separation through Multiscale Computed Tomography

Yang¹,

Xu²,

Liu

et al. 2019

Metals

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In this study, X-ray computed tomography was used to analyze powder binder separation in TC4 green bodies. Firstly, for the scanned results of the whole green body, because of the relative low resolution (36 µm), the powder binder separation can only be analyzed by using gray value distribution. Then, local regions (areas near the gate and the central parts) were scanned by using a much higher resolution (2.3 µm). Both of the volume fraction of powder content and gray value distributions indicate that powder particles tend to accumulate in the central parts. Finally, based on the results tested by using submicron resolution (0.8 µm), the effects of the volume and morphology of the powder particles on the powder binder separation were analyzed.

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High-temperature strength and damage evolution in short fiber reinforced aluminum alloys studied by miniature creep testing and synchrotron microtomography

Cited by 26 publications

References 28 publications

Real internal microstructure based key mechanism analysis on the micro-damage process of short fibre-reinforced composites

Real internal microstructure based key mechanism analysis on the micro-damage process of short fibre-reinforced composites

Novel Applications of Aluminium Metal Matrix Composites

Analysis of Powder Binder Separation through Multiscale Computed Tomography

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