Thermal expansion behaviour of aluminum matrix composites with densely packed SiC particles

Nam, Tran Huu; Requena, Guillermo; Degischer, Peter

doi:10.1016/j.compositesa.2008.01.011

Cited by 124 publications

(48 citation statements)

References 25 publications

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“…Only voids > (~ 5µm)³ are resolved by the produced tomographies, therefore the given volume fractions only indicate the relative change reliably. During thermal cycling large microstresses between the particles and the matrix (CTE mismatch) change the void volume fraction by visco-plastic matrix deformation (Nam et al, 2008) as indicated by the 2D finite element analysis presented in Fig. 14. The matrix embedded in a 3D reinforcement (Nam et al, 2008).…”

Section: Neutron Diffraction 274mentioning

confidence: 99%

“…During thermal cycling large microstresses between the particles and the matrix (CTE mismatch) change the void volume fraction by visco-plastic matrix deformation (Nam et al, 2008) as indicated by the 2D finite element analysis presented in Fig. 14. The matrix embedded in a 3D reinforcement (Nam et al, 2008). structure expands during heating and closes the voids (CTE decay in Fig.…”

Section: Neutron Diffraction 274mentioning

confidence: 99%

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Determination of Internal Stresses in Lightweight Metal Matrix Composites

Requena¹,

Garcés²,

Fernández³

et al. 2012

Neutron Diffraction

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Section: Neutron Diffraction 274mentioning

confidence: 99%

Section: Neutron Diffraction 274mentioning

confidence: 99%

Determination of Internal Stresses in Lightweight Metal Matrix Composites

Requena¹,

Garcés²,

Fernández³

et al. 2012

Neutron Diffraction

Self Cite

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“…Studies on thermal expansion behavior of MMCs are scanty. T. H. Nam et al focused on the effect of size and shape of the reinforcement, elastic properties of matrix and reinforcement on CTE [13]. M. E. Smagorinski et al found that with the addition of ceramic particles, there was a reduction in CTE of composites and increase in thermal conductivity [14].…”

Section: Introductionmentioning

confidence: 99%

“…Many analytical models developed by Kerner, Turner, and Schapery bounds [13] are used to predict thermal expansion behavior of composites. These thermoelastic models are having been used to understand the dependence of CTE on weight fraction of CTE within elastic limits.…”

Section: Introductionmentioning

confidence: 99%

Effect of Beryllium Aluminum Cyclosilicate on Thermal Expansion Behavior of Al-Based Composites

Bharat¹,

Prasad²,

Venkateswarlu³

2017

JMMCE

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Beryllium aluminum cyclosilicate, an ore of beryllium was reinforced in Aluminum matrix to fabricate Al-beryl composites using powder metallurgy. Effect of the content of beryllium aluminum cyclosilicate on microstructural hardness and thermal expansion was studied. The coefficient of thermal expansion of Al-beryl composite was measured in the temperature range between 50˚C to 360˚C using dilatometer and was theoretically studied using thermo-elastic models, and these models were used to explain abnormalities observed experimentally. The hardness of Al-beryl metal matrix composites increased with the increase in beryl percentage. Vacuum sintering of Al-beryl metal matrix composites at 600˚C inhibited excellent bonding between the matrix and the particulate increasing the strength of the composite. The result shows the CTE significantly increased with increasing temperature but decreased with increasing reinforcement. At higher temperatures, CTE of Al-beryl metal matrix composites with 5 wt%, 10 wt% and 15 wt% of beryllium aluminum cyclosilicate was 21 ppm/K, 18.2 ppm/K, and 16.8 ppm/K. The CTE values were found to be comparable with theoretical results. The turner model showed conformance with experimental results, was well suited to the experimental results.

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“…The difference above 200 °C was explained by stress induced void closure during heating and reopening after cooling [6]. The CTE(T) curve of the composite was simulated using a 2D elasto-plastic FE model allowing a stress induced reduction of the void volume fraction in an AlSi7Mg/SiC/70p composite [7]. The aim of this work was to determine the internal stresses in AlSiC and to correlate them with the void kinetics and the resulting CTE behavior.…”

Section: Introductionmentioning

confidence: 99%

Internal stresses and voids in SiC particle reinforced aluminum composites for heat sink applications

Schöbel

Altendorfer

Degischer

et al. 2011

Composites Science and Technology

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Please cite this article as: Schöbel, M., Altendorfer, W., Degischer, H.P., Vaucher, S., Buslaps, T., Di Michiel, M., Hofmann, M., Internal stresses and voids in SiC particle reinforced aluminum composites for heat sink applications, Composites Science and Technology (2011), doi: 10.1016/j.compscitech.2011 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. of 19Internal stresses and voids in SiC particle reinforced aluminum composites for heat sink applications of 19 AbstractMetal matrix composites (MMC) are being developed for power electronic IGBT modules, where the heat generated by the high power densities has to be dissipated from the chips into a heat sink. As a means of increasing long term stability a base plate material is needed with a good thermal conductivity (TC) combined with a low coefficient of thermal expansion (CTE) matching the ceramic insulator. SiC particle reinforced aluminum (AlSiC) offers the high TC of a metal with the low CTE of a ceramic. Internal stresses are generated at the matrix-particle interfaces due to the CTE mismatch between the constituents of the MMC during changing temperatures. Neutron and synchrotron diffraction was performed to evaluate the micro stresses during thermal cycling. The changes in void volume fraction, caused by plastic matrix deformation, are visualized by synchrotron tomography. The silicon content in the matrix connecting the particles to a network of hybrid reinforcement contributes essentially to the long term stability by an interpenetrating composite architecture.

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Thermal expansion behaviour of aluminum matrix composites with densely packed SiC particles

Cited by 124 publications

References 25 publications

Determination of Internal Stresses in Lightweight Metal Matrix Composites

Determination of Internal Stresses in Lightweight Metal Matrix Composites

Effect of Beryllium Aluminum Cyclosilicate on Thermal Expansion Behavior of Al-Based Composites

Internal stresses and voids in SiC particle reinforced aluminum composites for heat sink applications

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